Fix C-warnings (#10)

* .envrc is not for git

* Fix c code - avoid warnings

* Bump Erlang versions in Github workflows

.github/workflows/Makefile

@@ -0,0 +1,3 @@
+all:
+	cue export --out yaml > ci.yaml
+

.github/workflows/actions.cue

@@ -0,0 +1,37 @@
+package actions
+
+#Name: string
+#Branches: branches: [...string]
+#Tags: tags: [...string]
+
+#On: {
+	push?:         #Branches
+	pull_request?: #Branches
+	page_build?:   #Branches
+}
+
+#Action: "actions/checkout@v2" | "erlef/setup-beam@v1"
+#Uses: {
+	uses: #Action
+	with?: {
+		...
+	}
+}
+#Run: {
+	name: string
+	run:  string
+}
+#Steps: #Uses | #Run
+
+#OS_Version: *"ubuntu-latest" | "macos-latest" | "windows_latest"
+
+#Jobs: ci: {
+	name:      string
+	"runs-on": string
+	strategy:
+		matrix: {
+			otp_vsn: [...string]
+			os: [...#OS_Version]
+		}
+	steps: [...#Steps]
+}

.github/workflows/ci.yaml

@@ -0,0 +1,34 @@
+name: build
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  ci:
+    name: Run checks and tests over ${{matrix.otp_vsn}} and ${{matrix.os}}
+    runs-on: ${{matrix.os}}
+    strategy:
+      matrix:
+        otp_vsn:
+        - "24.3"
+        - "25.3"
+        - "26.2"
+        os:
+        - ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: erlef/setup-beam@v1
+      with:
+        otp-version: ${{matrix.otp_vsn}}
+        rebar3-version: 3.16.1
+    - name: Update apt-get database
+      run: sudo apt-get update
+    - name: Install libsodium
+      run: sudo apt-get install -y libsodium-dev
+    - name: Compile source code
+      run: make compile
+    - name: Run the tests
+      run: make tests

.github/workflows/setup.cue

@@ -0,0 +1,21 @@
+package actions
+
+name: #Name & "build"
+on:   #On & {
+	push: branches: [
+		_branch,
+	]
+	pull_request: branches: [
+		_branch,
+	]
+}
+
+jobs: #Jobs
+jobs: ci: {
+	name:      "Run checks and tests over ${{matrix.otp_vsn}} and ${{matrix.os}}"
+	"runs-on": "${{matrix.os}}"
+	strategy: matrix: {
+		otp_vsn: _versions.otp
+		os: ["ubuntu-latest"]
+	}
+}

.github/workflows/steps.cue

@@ -0,0 +1,40 @@
+package actions
+
+// Versions for simplicity
+_versions: {
+	// The versions here have an underlying Debian/Ubuntu which support enough of
+	// libsodium to handle what enacl provides. Older versions will fail to compile
+	otp: ["22.3", "23.3", "24.0"]
+	rebar3: "3.16.1"
+}
+
+_branch: "master"
+
+jobs: ci: steps:
+[
+	{
+		uses: "actions/checkout@v2"
+	},
+	{
+		uses: "erlef/setup-beam@v1"
+		with: {
+			"otp-version":    "${{matrix.otp_vsn}}"
+			"rebar3-version": _versions.rebar3
+		}
+	},
+	{
+		name: "Update apt-get database"
+		run:  "sudo apt-get update"
+	},
+	{
+		name: "Install libsodium"
+		run:  "sudo apt-get install -y libsodium-dev"
+	},
+	{
+		name: "Compile source code"
+		run:  "make compile"
+	},
+	{
+		name: "Run the tests"
+		run:  "make tests"
+	}]

.gitignore

@@ -1,5 +1,6 @@
 .rebar
 .rebar3
+.envrc
 ebin
 *.beam
 *.o
@@ -12,3 +13,8 @@ doc/*.png
 doc/*.css
 _build
 /.eqc-info
+priv/enacl_nif.dll
+priv/enacl_nif.exp
+priv/enacl_nif.lib
+c_src/*.d
+

.vscode/c_cpp_properties.json

@@ -0,0 +1,16 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [],
+            "compilerPath": "/nix/store/fb30zc52va0g99q8qgv7kx4ngq163pii-gcc-wrapper-9.3.0/bin/gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "clang-x64"
+        }
+    ],
+    "version": 4
+}

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "C_Cpp.errorSquiggles": "Disabled"
+}

CHANGELOG.md

@@ -5,18 +5,139 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [1.2.1]
+
+### Fixed [1.2.1]
+
+- Export types from the `enacl` module so it can be referenced in other parts of your system (serokell.io)
+
+## [1.2.0]
+
+### Fixed [1.2.0]
+
+- `sign_verify_detached/3` The code now verifies the size of signatures in detached mode. Before
+  this change, you could supply a larger binary and the code would only use the first `SIGNBYTES`
+  of the binary, assuming the signature were in there. Now, it fails with a badarg if the signature
+  doesn't match expectation in size.
+
+## [1.1.1]
+
+### Added [1.1.1]
+
+- Introduce the ability to reload the enacl module (Bryan Paxton, @starbelly)
+
+## [1.1.0]
+
+### Added [1.1.0]
+
+- Secretstream support was added to the API (Alexander Malaev)
+- Add KDF functions (Nicolas Goy, @kuon)
+- Add pwhash/5 specifying what algorithm to use for older compatibility (Nicolas Goy, @kuon)
+
+### Changed [1.1.0]
+
+- Remove rebar3_hex as a direct dependency (Bryan Paxton, @starbelly)
+
+## [1.0.0]
+
+### Compatibility [1.0.0]
+
+- Some functions have been streamlined to badarg in certain cases where it made more
+  sense to do so than returning back an error to the caller.
+- Functions generally don't return error values for internal errors. They now raise
+  exceptions when this happens. If you can't allocate a binary, there is usually not
+  much the programmer can do with that information, sans crashing.
+- If you used `aead_chacha20poly1305_*` functions, please read through the changelog
+  carefully as we have made changes to these functions. TL;DR: look for
+  `aead_chacha20poly1305_ietf_*` but note it is *not* just a simple substitution
+  into your code.
+- The `kx` constants have been renamed to follow libsodium one-to-one.
+- All calls with `verify` now returns booleans. See `sign_verify_detached`, which
+  were changed by this.
+- Many constants were changed to their underlying libsodium names.
+
+### Removed [1.0.0]
+
+- The functions of the form `aead_chacha20poly1305_*` were removed. They implement
+  the IETF variant, and the argument order for them were wrong. Also, they used
+  severely limited nonce values, which is somewhat dangerous. The `..._NONCEBYTES`
+  name was changed to the consistent `..._NPUBBYTES`.
+
+### Added [1.0.0]
+
+- Added `aead_chacha20poly1305_ietf_*` variants.
+- Implement multipart signature support, by Garry Hill.
+- Implement enacl:crypto_sign_seed_keypair/1, by Ole Andre Birkedal.
+- Implement enacl:crypto_sign_ed25519_sk_to_pk/1, by an anonymous contribution.
+- Added AEAD XChaCha20-Poly1305 support, thanks to Github/ECrownofFire.
+- The Password Hash Generation functions now support memory and operations limits,
+  thanks to Github/ECrownofFire.
+- Implement enacl:randombytes_uint32/0. Returns a random 32bit unsigned
+  integer, by means of the underlying random source.
+- Implement enacl:randombytes_uniform/1. Takes up to a 32bit unsigned
+  integer and produces a uniform integer in the range [0..N). Note
+  that the implementation avoids the typical non-uniformness which
+  would be present on a modulus operation on the nearest power-of-two
+  integer.
+- Added Win32 build support (Tino Breddin)
+- Added a nix shell for easier development
+
+### Changed [1.0.0]
+
+- Started a split the C code over multiple files for easier maintenance.
+- Rewrote the generichash routines to be more consistent. We are now more-or-less
+  following the style of the Erlang/OTP `crypto` library. While here, make sure
+  we clean up correctly and that we don't accidentally mis-ref-count data. The
+  code is a bit more goto heavy, but this style is surprisingly common in C code.
+- Use sodium's dynamic memory allocators. These guarantee 64bit alignment, and also
+  provide guard pages around the allocation, somewhat protecting it. It adds some
+  page table pressure compared to the current code, but is easier to maintain and
+  much cleaner code.
+- The code now rejects updates to generichash states which were already finalized.
+- We now track the desired outlen of a generichash operation in the opaque NIF
+  resource rather than on the Erlang side. This avoids some checks in the code,
+  and streamlines a good deal of the interface.
+- Split AEAD routines off from the main enacl_nif.c file
+- Renamed many routines from enif_* to enacl_*. This better reflects where they live
+  in the code base, and avoids pollution of the enif_* "namespace".
+- Split Sign Public Key routines from the rest. Modernize the handling of contexts.
+- The multi-part generic hash routines now follow the structure of the crypto
+  modules multi-part constructions in API and style.
+- The AEAD constructions have been streamlined so they follow the rules of libsodium
+  closer than before. In particular, some dead code has been removed as a result.
+- Constants are now named by their libsodium counterpart. This should make it easier
+  to find the correct names given the libsodium documentation.
+- Generichash now checks if a `_final` call has already happened and rejects further
+  hashing on the object. The rejection is an error: if you ever do this, your code
+  is definitely wrong and there is no recovery possible.
+
+### Fixed [1.0.0]
+
+- Fix a resource leak in generichash/sign init/update/final.
+- Clang static analysis warnings (Thomas Arts).
+- Replace a constant 31 with a computation from libsodium (Thomas Arts, from a security review).
+- Some subtle memory leaks in the error path for kx operations were plugged.
+- The multi-part generichash interface is now properly process/thread safe.
+- The sign interface is now properly process/thread safe.
+
+## [0.17.2]
+
+### Fixed [0.17.2]
+
+- Work around `rebar3 hex` publishing .so files
 
 ## [0.17.1]
 
-### Fixed
+### Fixed [0.17.1]
+
 - Provide a fix for the `pwhash_str/x` functions. The C strings were
   not properly handled wrt. NULL-termination and what the libsodium
   library expects.
 
 ## [0.17.0]
 
-### Added
+### Added [0.17.0]
+
 - Expose the AEAD ChaCha20 Poly1305 (IETF) functionality (Hans
   Svensson / Quviq).
 - Expose Curve25519 Scalar Multiplication over a base point in the
@@ -28,11 +149,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
   to verify the enacl library on embedded platforms and so on.
 - Support generichash functions (Venkatakumar Srinivasan / Xaptum)
 
-### Fixed
+### Fixed [0.17.0]
+
 - The type specification of generichash/2 and generichash/3 was
   corrected (Technion)
 
-### Changed
+### Changed [0.17.0]
+
 - Removed the experimental feature flag `ERL_NIF_DIRTY_JOB_CPU_BOUND`.
   This breaks compatibility with older Erlang releases of dirty
   schedulers, but prepares us correctly for the new releases where the
@@ -50,24 +173,26 @@ Bump libsodium requirement to version 1.0.12. This gives us access to
 a number of functions which are added recently and thus gives us
 access to implement these from libsodium.
 
-### Added
+### Added [0.16.0]
 
 - Add kx_* functions (Alexander Malaev)
 - chacha stream functions added, siphash-2-4 added, unsafe_memzero/1
   added (no attribution)
 
-### Fixed
+### Fixed [0.16.0]
+
 - Do not use the dirty-scheduler test macro as it is gone.
 
 ## [0.15.0]
 
-### Fixed
+### Fixed [0.15.0]
+
 - Using `enacl:sign_verify_detacted` on large iolists would fail to do
   the correct thing due to a typo. This has been corrected. Also the
   EQC tests have been extended to include large binary support to
   capture these kinds of errors in the future.
 
-### Changed
+### Changed [0.15.0]
 
 - Many dirty-scheduler tunings have been performed to make sure we
   won't block a scheduler ever.
@@ -83,33 +208,40 @@ a better citizen to other libraries and other parts of the system.
 
 ## [0.14.0]
 
-### Added
+### Added [0.14.0]
+
 - Add support for libsodiums `box_seal` functions (Amir Ghassemi Nasr)
 - Add support for libsodiums `crypto_sign_detached` (Joel Stanley,
   Parnell Springmeyer)
-### Changed
+
+### Changed [0.14.0]
+
 - Switch the tag names to the form `0.14.0` rather than `v0.14.0`. For
   this release both tags are present, but from the next release on, it
   won't be the case.
 
 ## [0.13.0]
 
-### Fixed
+### Fixed [0.13.0]
+
 - Quell warnings from the C code
 
-### Added
+### Added [0.13.0]
+
 - Add Ed 25519 utility API (Alexander Færøy)
 - Add FreeBSD support for the NIF compilation (Ricardo Lanziano)
 
 ## [0.12.1]
 
-### Changed
+### Changed [0.12.1]
+
 - Provide the `priv` directory for being able to properly build
   without manual intervention.
 
 ## [0.12.0]
 
-### Added
+### Added [0.12.0]
+
 - Introduce an extension interface for various necessary extensions to
   the eNaCl system for handling the Tor network, thanks to Alexander
   Færøy (ahf).
@@ -119,12 +251,15 @@ a better citizen to other libraries and other parts of the system.
 
 ## [0.11.0]
 
-### Added
+### Added [0.11.0]
+
 - Introduce NIF layer beforenm/afternm calls.
 - Introduce the API for precomputed keys (beforenm/afternm calls).
 - Use test cases which tries to inject `iodata()` rather than binaries
   in all places where `iodata()` tend to be accepted.
-### Fixed
+
+### Fixed [0.11.0]
+
 - Fix type for `enacl:box_open/4`. The specification was wrong which
   results in errors in other applications using enacl.
 
@@ -132,7 +267,8 @@ a better citizen to other libraries and other parts of the system.
 
 Maintenance release. Fix some usability problems with the library.
 
-### Fixed
+### Fixed [0.10.2]
+
 - Do not compile the C NIF code if there are no dirty scheduler
   support in the Erlang system (Thanks to David N. Welton)
 - Fix dialyzer warnings (Thanks Anthony Ramine)
@@ -146,7 +282,7 @@ Maintenance release. Fix some usability problems with the library.
 
 ## [0.10.1]
 
-### Added
+### Added [0.10.1]
 
 - This small patch-release provides tests for the `randombytes/1`
 function call, and optimizes EQC tests to make it easier to implement
@@ -162,15 +298,15 @@ included in this library.
 Ultra-late beta; tuning for the last couple of functions which could
 be nice to have.
 
-### Added
+### Added [0.10.0]
 
 Added the function `randombytes/1` to obtain randombytes from the
 operating system. The system uses the "best" applicable (P)RNG on the
 target system:
 
-* Windows: `RtlGenRandom()`
-* OpenBSD, Bitrig: `arc4random()`
-* Unix in general: `/dev/urandom`
+- Windows: `RtlGenRandom()`
+- OpenBSD, Bitrig: `arc4random()`
+- Unix in general: `/dev/urandom`
 
 Do note that on Linux and FreeBSD at the *least*, this is the best
 thing you can do. Relying on `/dev/random` is almost always wrong and
@@ -184,4 +320,3 @@ Ultra-late beta. Code probably works, but it requires some real-world
 use before it is deemed entirely stable.
 
 Initial release.
-

CONTRIBUTORS

@@ -3,9 +3,15 @@ List of people who have contributed to the eNaCl source code:
 Alexander Færøy
 Alexander Malaev
 Amir Ghassemi Nasr
+Bryan Paxton
+GitHub/ECrownofFire
 Geller Bedoya
 Jesper Louis Andersen
 Joel Stanley
 Konrad Zemek
+Nicolas Goy
 Parnell Springmeyer
 Ricardo Lanziano
+Tino Breddin
+Venkatakumar Srinivasan
+

Makefile

@@ -5,6 +5,10 @@ RUN_EQC=erl -pa _build/default/lib/enacl/ebin -noshell -s enacl_eqc -s init stop
 compile:
 	$(REBAR) compile
 
+.PHONY: tests
+tests:
+	$(REBAR) ct
+
 eqc_compile: compile
 	erlc -o _build/default/lib/enacl/ebin eqc_test/enacl_eqc.erl
 

README.md

@@ -6,17 +6,15 @@ Frank Denis took the source and made it far more portable in the
 libsodium library. The enacl project is somewhat misnamed, as it uses
 libsodium as the underlying driver.
 
-Several Erlang ports of NaCl/libsodium exists, but this one is a
-rewrite with the following foci:
+## INSTALL/Requirements
 
-## INSTALL/Requirements:
+* New-ish Erlang installation. Tested back to version 22.3, but version 21 *may*
+  work as well.
+* *Requires* the libsodium library, and has been tested with version
+  1.0.18. Lower versions might work, or they might fail to compile,
+  due to missing functionality. In particular, this means your libsodium installation
+  must be fairly recent as well.
 
-* Erlang/OTP 17.3. This library *needs* the newest dirty scheduler
-  implementation. The library relies on dirty scheduler support in
-  order to handle long-running cryptography jobs, by moving them off
-  the main Erlang scheduler and letting the dirty schedulers handle
-  the work. This keeps the Erlang VM responsive.
-* *Requires* the libsodium library, and at least in version 1.0.12.
 *Note:* If installing on systems which cuts packages into
 subpackages, make sure you also get the "-dev" package containing
 the header files necessary in order to compile software linking to
@@ -38,10 +36,10 @@ To build and run eqc-mini version of test execute:
 
   make eqc_mini_run
 
-## Features:
+## Features
 
 * Complete NaCl library, implementing all default functionality.
-* Implements a small set of additional functionality from libsodium.
+* Implements a large set of additional functionality from libsodium.
   Most notably access to a proper CSPRNG random source
 * Tests created by aggressive use of Erlang QuickCheck.
 * NaCl is a very fast cryptographic library. That is,
@@ -60,16 +58,12 @@ In addition, I would like to thank Steve Vinoski, Rickard Green, and
 Sverker Eriksson for providing the Dirty Scheduler API in the first
 place.
 
-# USING:
+## Usage
 
-In general, consult the libsodium documentation at
-
-    https://download.libsodium.org/doc/
+In general, consult the libsodium documentation at [Libsodium documentation](https://download.libsodium.org/doc/)
 
 The original NaCl documentation is nowadays largely superceded by the
-libsodium documentation, but it is still worth a visit
-
-	https://nacl.cr.yp.to
+libsodium documentation, but it is still worth a visit [NaCl website](https://nacl.cr.yp.to)
 
 but also note that our interface has full Edoc documentation,
 generated by executing
@@ -132,11 +126,11 @@ However, their correct use is still needed in order to be secure:
   a foreign system as an oracle in order to learn the structure of a
   string, breaking the cryptograhic system in the process.
 
-# Versions
+## Versions
 
 See CHANGELOG.md
 
-# Overview
+## Overview
 
 The NaCl cryptographic library provides a number of different
 cryptographic primitives. In the following, we split up the different
@@ -198,7 +192,7 @@ This implements cryptography where there is a shared secret key between parties.
 * *String comparison:* Implements guaranteed constant-time string
   comparisons to protect against timing attacks.
 
-# Rationale
+## Rationale
 
 Doing crypto right in Erlang is not that easy. For one, the crypto
 system has to be rather fast, which rules out Erlang as the main
@@ -250,7 +244,7 @@ perhaps being able to switch faster. There are plans to rerun these
 tests on OSX and Illumos as well, in order to investigate the numbers
 on more platforms.
 
-# Testing
+## Testing
 
 Every primitive has been stress-tested through the use of Erlang
 QuickCheck with both *positive* and *negative* testing. This has been
@@ -277,11 +271,8 @@ sure we have no memory leaks as they will show themselves under the
 extensive QuickCheck test cases we run. It has been verified there are
 no leaks in the code.
 
-# Notes
+## Notes
 
 [0] Other people have worked on bits and pieces of NaCl. These are
-just the 3 main authors. Please see the page
-
-	http://nacl.cr.yp.to
-	
+just the 3 main authors. Please see the page [NaCl](http://nacl.cr.yp.to)
 for the full list of authors.

bench/timing.erl

@@ -47,7 +47,7 @@ box() ->
     #{ public := PK1} = enacl:box_keypair(),
     #{ secret := SK2} = enacl:box_keypair(),
     B = binary:copy(<<0>>, 1),
-    Nonce = binary:copy(<<0>>, enacl:box_nonce_size()),
+    Nonce = binary:copy(<<0>>, enacl:box_NONCEBYTES()()),
     box(B, Nonce, PK1, SK2, 10*1000).
 
 box(_B, _Nonce, _PK1, _SK2, 0) -> ok;
@@ -62,7 +62,7 @@ box_before_after() ->
     box_beforenm(PK1, SK2, 10*1000),
     R = enacl:box_beforenm(PK1, SK2),
     B = binary:copy(<<0>>, 8192),
-    Nonce = binary:copy(<<0>>, enacl:box_nonce_size()),
+    Nonce = binary:copy(<<0>>, enacl:box_NONCEBYTES()()),
     box_afternm(B, Nonce, R, 10*1000),
     ok.
 
@@ -100,8 +100,8 @@ sign(Msg, SK, N) ->
 
 secretbox() ->
     Msg = binary:copy(<<0>>, 8192),
-    Nonce = binary:copy(<<0>>, enacl:secretbox_nonce_size()),
-    Key = binary:copy(<<0>>, enacl:secretbox_key_size()),
+    Nonce = binary:copy(<<0>>, enacl:secretbox_NONCEBYTES()()),
+    Key = binary:copy(<<0>>, enacl:secretbox_KEYBYTES()),
     secretbox(Msg, Nonce, Key, 10*1000).
 
 secretbox(_Msg, _Nonce, _Key, 0) -> ok;
@@ -111,7 +111,7 @@ secretbox(Msg, Nonce, Key, N) ->
 
 
 stream() ->
-    stream(16384, binary:copy(<<0>>, enacl:stream_nonce_size()), binary:copy(<<0>>, enacl:stream_key_size()), 10*1000).
+    stream(16384, binary:copy(<<0>>, enacl:stream_NONCEBYTES()), binary:copy(<<0>>, enacl:stream_KEYBYTES()), 10*1000).
 
 stream(_L, _Nonce, _K, 0) -> ok;
 stream(L, Nonce, K, N) ->
@@ -120,7 +120,7 @@ stream(L, Nonce, K, N) ->
 
 auth() ->
     Msg = binary:copy(<<0>>, 4096),
-    Key = binary:copy(<<0>>, enacl:auth_key_size()),
+    Key = binary:copy(<<0>>, enacl:auth_KEYBYTES()),
     auth(Msg, Key, 10*1000).
 
 auth(_Msg, _Key, 0) -> ok;
@@ -130,7 +130,7 @@ auth(Msg, Key, N) ->
 
 onetime_auth() ->
     Msg = binary:copy(<<0>>, 16384),
-    Key = binary:copy(<<0>>, enacl:onetime_auth_key_size()),
+    Key = binary:copy(<<0>>, enacl:onetime_auth_KEYBYTES()),
     onetime_auth(Msg, Key, 10*1000).
 
 onetime_auth(_Msg, _Key, 0) -> ok;

c_src/Makefile

@@ -1,75 +0,0 @@
-# Based on c_src.mk from erlang.mk by Loïc Hoguin <essen@ninenines.eu>
-
-PROJECT ?= enacl_nif
-
-ERTS_INCLUDE_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s/erts-~s/include/\", [code:root_dir(), erlang:system_info(version)]).")
-ERL_INTERFACE_INCLUDE_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s\", [code:lib_dir(erl_interface, include)]).")
-ERL_INTERFACE_LIB_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s\", [code:lib_dir(erl_interface, lib)]).")
-
-C_SRC_DIR = $(CURDIR)
-C_SRC_OUTPUT ?= $(CURDIR)/../priv/$(PROJECT).so
-
-# System type and C compiler/flags.
-MACHINE_SYS := $(shell uname -m)
-UNAME_SYS := $(shell uname -s)
-ifeq ($(UNAME_SYS), Darwin)
-	CC ?= cc
-	CFLAGS ?= -O3 -std=c99 -arch x86_64 -finline-functions -Wall -Wmissing-prototypes
-	CXXFLAGS ?= -O3 -arch x86_64 -finline-functions -Wall
-	LDFLAGS ?= -arch x86_64 -flat_namespace -undefined suppress
-else ifeq ($(UNAME_SYS), FreeBSD)
-	CC ?= cc
-	CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes -I /usr/local/include
-	CXXFLAGS ?= -O3 -finline-functions -Wall
-	LDFLAGS ?= -fPIC -L /usr/local/lib
-else ifeq ($(UNAME_SYS), Linux)
-	CC ?= gcc
-	CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes
-	CXXFLAGS ?= -O3 -finline-functions -Wall
-else ifeq ($(UNAME_SYS), SunOS)
-	CC = gcc
-	CFLAGS ?= -m64 -I/opt/local/include -O2 -std=c99 -finline-functions -Wall -Wmissing-prototypes
-	CXXFALGS ?= -O2 -finline-function -Wall
-	LDFLAGS ?= -m64 -fPIC -L /opt/local/lib
-endif
-
-CFLAGS += -fPIC -I $(ERTS_INCLUDE_DIR) -I $(ERL_INTERFACE_INCLUDE_DIR)
-CXXFLAGS += -fPIC -I $(ERTS_INCLUDE_DIR) -I $(ERL_INTERFACE_INCLUDE_DIR)
-
-LDLIBS += -L $(ERL_INTERFACE_LIB_DIR) -lerl_interface -lei -lsodium
-LDFLAGS += -shared
-
-# Verbosity.
-
-c_verbose_0 = @echo " C     " $(?F);
-c_verbose = $(c_verbose_$(V))
-
-cpp_verbose_0 = @echo " CPP   " $(?F);
-cpp_verbose = $(cpp_verbose_$(V))
-
-link_verbose_0 = @echo " LD    " $(@F);
-link_verbose = $(link_verbose_$(V))
-
-SOURCES := $(shell find $(C_SRC_DIR) -type f \( -name "*.c" -o -name "*.C" -o -name "*.cc" -o -name "*.cpp" \))
-OBJECTS = $(addsuffix .o, $(basename $(SOURCES)))
-
-COMPILE_C = $(c_verbose) $(CC) $(CFLAGS) $(CPPFLAGS) -c
-COMPILE_CPP = $(cpp_verbose) $(CXX) $(CXXFLAGS) $(CPPFLAGS) -c
-
-$(C_SRC_OUTPUT): $(OBJECTS)
-	$(link_verbose) $(CC) $(OBJECTS) $(LDFLAGS) $(LDLIBS) -o $(C_SRC_OUTPUT)
-
-%.o: %.c
-	$(COMPILE_C) $(OUTPUT_OPTION) $<
-
-%.o: %.cc
-	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
-
-%.o: %.C
-	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
-
-%.o: %.cpp
-	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
-
-clean:
-	@rm -f $(C_SRC_OUTPUT) $(OBJECTS)

c_src/aead.c

@@ -0,0 +1,242 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "aead.h"
+#include "enacl.h"
+
+/*
+ * AEAD ChaCha20 Poly1305
+ */
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_KEYBYTES(ErlNifEnv *env, int argc,
+                                                 ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_aead_chacha20poly1305_ietf_KEYBYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_NPUBBYTES(ErlNifEnv *env, int argc,
+                                                  ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_aead_chacha20poly1305_ietf_NPUBBYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_ABYTES(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_aead_chacha20poly1305_ietf_ABYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX(
+    ErlNifEnv *env, int argc, ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env,
+                         crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX);
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_encrypt(ErlNifEnv *env, int argc,
+                                                ERL_NIF_TERM const argv[]) {
+  ERL_NIF_TERM ret;
+  ErlNifBinary key, nonce, ad, message, ciphertext;
+
+  if (argc != 4)
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[0], &message))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &ad))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[2], &nonce))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[3], &key))
+    goto bad_arg;
+  if (key.size != crypto_aead_chacha20poly1305_ietf_KEYBYTES)
+    goto bad_arg;
+  if (nonce.size != crypto_aead_chacha20poly1305_ietf_NPUBBYTES)
+    goto bad_arg;
+
+  if (!enif_alloc_binary(message.size +
+                             crypto_aead_chacha20poly1305_ietf_ABYTES,
+                         &ciphertext)) {
+    goto err;
+  }
+
+  crypto_aead_chacha20poly1305_ietf_encrypt(ciphertext.data, NULL, message.data,
+                                            message.size, ad.data, ad.size,
+                                            NULL, nonce.data, key.data);
+
+  ret = enif_make_binary(env, &ciphertext);
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+err:
+  ret = enacl_internal_error(env);
+done:
+  return ret;
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_decrypt(ErlNifEnv *env, int argc,
+                                                ERL_NIF_TERM const argv[]) {
+  ERL_NIF_TERM ret;
+  ErlNifBinary key, nonce, ad, message, ciphertext;
+
+  if (argc != 4)
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[0], &ciphertext))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &ad))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[2], &nonce))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[3], &key))
+    goto bad_arg;
+
+  if (ciphertext.size < crypto_aead_chacha20poly1305_ietf_ABYTES)
+    goto bad_arg;
+  if (key.size != crypto_aead_chacha20poly1305_ietf_KEYBYTES)
+    goto bad_arg;
+  if (nonce.size != crypto_aead_chacha20poly1305_ietf_NPUBBYTES)
+    goto bad_arg;
+
+  if (!enif_alloc_binary(ciphertext.size -
+                             crypto_aead_chacha20poly1305_ietf_ABYTES,
+                         &message)) {
+    return enacl_internal_error(env);
+  }
+
+  if (crypto_aead_chacha20poly1305_ietf_decrypt(
+          message.data, NULL, NULL, ciphertext.data, ciphertext.size, ad.data,
+          ad.size, nonce.data, key.data) != 0) {
+    ret = enacl_error_tuple(env, "failed_verification");
+    goto release;
+  }
+
+  ret = enif_make_binary(env, &message);
+  goto done;
+bad_arg:
+  return enif_make_badarg(env);
+release:
+  enif_release_binary(&message);
+done:
+  return ret;
+}
+
+/*
+ * AEAD XChaCha20 Poly1305
+ */
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_KEYBYTES(ErlNifEnv *env, int argc,
+                                                  ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_aead_xchacha20poly1305_ietf_KEYBYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_NPUBBYTES(ErlNifEnv *env, int argc,
+                                                   ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_aead_xchacha20poly1305_ietf_NPUBBYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_ABYTES(ErlNifEnv *env, int argc,
+                                                ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_aead_xchacha20poly1305_ietf_ABYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_MESSAGEBYTES_MAX(
+    ErlNifEnv *env, int argc, ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env,
+                         crypto_aead_xchacha20poly1305_ietf_MESSAGEBYTES_MAX);
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_encrypt(ErlNifEnv *env, int argc,
+                                                 ERL_NIF_TERM const argv[]) {
+  ErlNifBinary key, nonce, ad, message, ciphertext;
+  ERL_NIF_TERM ret;
+
+  if (argc != 4)
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[0], &message))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &ad))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[2], &nonce))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[3], &key))
+    goto bad_arg;
+
+  if (key.size != crypto_aead_xchacha20poly1305_ietf_KEYBYTES)
+    goto bad_arg;
+  if (nonce.size != crypto_aead_xchacha20poly1305_ietf_NPUBBYTES)
+    goto bad_arg;
+
+  if (!enif_alloc_binary(message.size +
+                             crypto_aead_xchacha20poly1305_ietf_ABYTES,
+                         &ciphertext)) {
+    goto err;
+  }
+
+  crypto_aead_xchacha20poly1305_ietf_encrypt(
+      ciphertext.data, NULL, message.data, message.size, ad.data, ad.size, NULL,
+      nonce.data, key.data);
+
+  ret = enif_make_binary(env, &ciphertext);
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+err:
+  ret = enacl_internal_error(env);
+done:
+  return ret;
+}
+
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_decrypt(ErlNifEnv *env, int argc,
+                                                 ERL_NIF_TERM const argv[]) {
+  ErlNifBinary key, nonce, ad, message, ciphertext;
+  ERL_NIF_TERM ret;
+
+  if (argc != 4)
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[0], &ciphertext))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &ad))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[2], &nonce))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[3], &key))
+    goto bad_arg;
+
+  if (ciphertext.size < crypto_aead_xchacha20poly1305_ietf_ABYTES)
+    goto bad_arg;
+  if (key.size != crypto_aead_xchacha20poly1305_ietf_KEYBYTES)
+    goto bad_arg;
+  if (nonce.size != crypto_aead_xchacha20poly1305_ietf_NPUBBYTES)
+    goto bad_arg;
+
+  if (!enif_alloc_binary(ciphertext.size -
+                             crypto_aead_xchacha20poly1305_ietf_ABYTES,
+                         &message)) {
+    return enacl_internal_error(env);
+  }
+
+  if (crypto_aead_xchacha20poly1305_ietf_decrypt(
+          message.data, NULL, NULL, ciphertext.data, ciphertext.size, ad.data,
+          ad.size, nonce.data, key.data) != 0) {
+    ret = enacl_error_tuple(env, "failed_verification");
+    goto release;
+  }
+
+  ret = enif_make_binary(env, &message);
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+release:
+  enif_release_binary(&message);
+done:
+  return ret;
+}

c_src/aead.h

@@ -0,0 +1,46 @@
+#ifndef ENACL_AEAD_H
+#define ENACL_AEAD_H
+
+#include <erl_nif.h>
+
+/* AEAD ChaCha20 Poly1305 */
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_KEYBYTES(ErlNifEnv *env, int argc,
+                                                 ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_NPUBBYTES(ErlNifEnv *env, int argc,
+                                                  ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_ABYTES(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX(
+    ErlNifEnv *env, int argc, ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_encrypt(ErlNifEnv *env, int argc,
+                                                ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_chacha20poly1305_ietf_decrypt(ErlNifEnv *env, int argc,
+                                                ERL_NIF_TERM const argv[]);
+
+/* AEAD XChaCha20 Poly1305 */
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_KEYBYTES(ErlNifEnv *env, int argc,
+                                                  ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_NPUBBYTES(ErlNifEnv *env, int argc,
+                                                   ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_ABYTES(ErlNifEnv *env, int argc,
+                                                ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_MESSAGEBYTES_MAX(
+    ErlNifEnv *env, int argc, ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_encrypt(ErlNifEnv *env, int argc,
+                                                 ERL_NIF_TERM const argv[]);
+ERL_NIF_TERM
+enacl_crypto_aead_xchacha20poly1305_ietf_decrypt(ErlNifEnv *env, int argc,
+                                                 ERL_NIF_TERM const argv[]);
+
+#endif

c_src/enacl.c

@@ -0,0 +1,16 @@
+#include <erl_nif.h>
+
+#include "enacl.h"
+
+ERL_NIF_TERM enacl_error_tuple(ErlNifEnv *env, char *error_atom) {
+  return enif_make_tuple2(env, enif_make_atom(env, "error"),
+                          enif_make_atom(env, error_atom));
+}
+
+ERL_NIF_TERM enacl_internal_error(ErlNifEnv *env) {
+  return enif_raise_exception(env, enif_make_atom(env, "enacl_internal_error"));
+}
+
+ERL_NIF_TERM enacl_error_finalized(ErlNifEnv *env) {
+  return enif_raise_exception(env, enif_make_atom(env, "enacl_finalized"));
+}

c_src/enacl.h

@@ -0,0 +1,15 @@
+#ifndef ENACL_H
+#define ENACL_H
+
+#include <erl_nif.h>
+
+#define ATOM_OK "ok"
+#define ATOM_ERROR "error"
+#define ATOM_TRUE "true"
+#define ATOM_FALSE "false"
+
+ERL_NIF_TERM enacl_error_tuple(ErlNifEnv *, char *);
+ERL_NIF_TERM enacl_error_finalized(ErlNifEnv *);
+ERL_NIF_TERM enacl_internal_error(ErlNifEnv *);
+
+#endif

c_src/enacl_ext.c

@@ -0,0 +1,86 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "enacl_ext.h"
+
+static void uint64_pack(unsigned char *y, ErlNifUInt64 x) {
+  *y++ = x;
+  x >>= 8;
+  *y++ = x;
+  x >>= 8;
+  *y++ = x;
+  x >>= 8;
+  *y++ = x;
+  x >>= 8;
+  *y++ = x;
+  x >>= 8;
+  *y++ = x;
+  x >>= 8;
+  *y++ = x;
+  x >>= 8;
+  *y++ = x;
+}
+
+static ErlNifUInt64 uint64_unpack(const unsigned char *x) {
+  ErlNifUInt64 result;
+
+  result = x[7];
+  result <<= 8;
+  result |= x[6];
+  result <<= 8;
+  result |= x[5];
+  result <<= 8;
+  result |= x[4];
+  result <<= 8;
+  result |= x[3];
+  result <<= 8;
+  result |= x[2];
+  result <<= 8;
+  result |= x[1];
+  result <<= 8;
+  result |= x[0];
+  return result;
+}
+
+static int crypto_block(unsigned char *out, const unsigned char *in,
+                        const unsigned char *k) {
+  ErlNifUInt64 v0 = uint64_unpack(in + 0);
+  ErlNifUInt64 v1 = uint64_unpack(in + 8);
+  ErlNifUInt64 k0 = uint64_unpack(k + 0);
+  ErlNifUInt64 k1 = uint64_unpack(k + 8);
+  ErlNifUInt64 k2 = uint64_unpack(k + 16);
+  ErlNifUInt64 k3 = uint64_unpack(k + 24);
+  ErlNifUInt64 sum = 0;
+  ErlNifUInt64 delta = 0x9e3779b97f4a7c15;
+  int i;
+  for (i = 0; i < 32; ++i) {
+    sum += delta;
+    v0 += ((v1 << 7) + k0) ^ (v1 + sum) ^ ((v1 >> 12) + k1);
+    v1 += ((v0 << 16) + k2) ^ (v0 + sum) ^ ((v0 >> 8) + k3);
+  }
+  uint64_pack(out + 0, v0);
+  uint64_pack(out + 8, v1);
+
+  return 0;
+}
+
+ERL_NIF_TERM enif_scramble_block_16(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]) {
+  ErlNifBinary in, out, key;
+
+  if ((argc != 2) || (!enif_inspect_binary(env, argv[0], &in)) ||
+      (!enif_inspect_binary(env, argv[1], &key)) || (in.size != 16) ||
+      (key.size != 32)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(in.size, &out)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_block(out.data, in.data, key.data);
+
+  return enif_make_binary(env, &out);
+}

c_src/enacl_ext.h

@@ -0,0 +1,9 @@
+#ifndef ENACL_EXT_H
+#define ENACL_EXT_H
+
+#include <erl_nif.h>
+
+ERL_NIF_TERM enif_scramble_block_16(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]);
+
+#endif

c_src/generichash.c

@@ -0,0 +1,301 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "generichash.h"
+
+typedef struct enacl_generichash_ctx {
+  ErlNifMutex *mtx;
+  crypto_generichash_state *ctx; // Underlying hash state from sodium
+  int alive;  // Is the context still valid for updates/finalizes?
+  int outlen; // Final size of the hash
+
+} enacl_generichash_ctx;
+
+static ErlNifResourceType *enacl_generic_hash_ctx_rtype;
+
+static void enacl_generic_hash_ctx_dtor(ErlNifEnv *env,
+                                        enacl_generichash_ctx *);
+
+int enacl_init_generic_hash_ctx(ErlNifEnv *env) {
+  enacl_generic_hash_ctx_rtype =
+      enif_open_resource_type(env, NULL, "enacl_generichash_context",
+                              (ErlNifResourceDtor *)enacl_generic_hash_ctx_dtor,
+                              ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER, NULL);
+
+  if (enacl_generic_hash_ctx_rtype == NULL)
+    return 0;
+
+  return 1;
+}
+
+static void enacl_generic_hash_ctx_dtor(ErlNifEnv *env,
+                                        enacl_generichash_ctx *obj) {
+  if (!obj->alive) {
+    return;
+  }
+
+  if (obj->ctx)
+    sodium_free(obj->ctx);
+
+  if (obj->mtx != NULL)
+    enif_mutex_destroy(obj->mtx);
+
+  return;
+}
+
+/*
+ * Generic hash
+ */
+ERL_NIF_TERM enacl_crypto_generichash_BYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_generichash_BYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_generichash_BYTES_MIN(ErlNifEnv *env, int argc,
+                                                ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_generichash_BYTES_MIN);
+}
+
+ERL_NIF_TERM enacl_crypto_generichash_BYTES_MAX(ErlNifEnv *env, int argc,
+                                                ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_generichash_BYTES_MAX);
+}
+
+ERL_NIF_TERM enacl_crypto_generichash_KEYBYTES(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_generichash_KEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_generichash_KEYBYTES_MIN(ErlNifEnv *env, int argc,
+                                                   ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_generichash_KEYBYTES_MIN);
+}
+
+ERL_NIF_TERM enacl_crypto_generichash_KEYBYTES_MAX(ErlNifEnv *env, int argc,
+                                                   ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_generichash_KEYBYTES_MAX);
+}
+
+ERL_NIF_TERM enacl_crypto_generichash(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]) {
+  ErlNifBinary hash, message, key;
+  unsigned hash_size;
+  ERL_NIF_TERM ret;
+
+  // Validate the arguments
+  if (argc != 3)
+    goto bad_arg;
+  if (!enif_get_uint(env, argv[0], &hash_size))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &message))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[2], &key))
+    goto bad_arg;
+
+  // Verify that hash size is
+  // crypto_generichash_BYTES/crypto_generichash_BYTES_MIN/crypto_generichash_BYTES_MAX
+  if ((hash_size < crypto_generichash_BYTES_MIN) ||
+      (hash_size > crypto_generichash_BYTES_MAX)) {
+    goto bad_arg;
+  }
+
+  // validate key size
+  unsigned char *k = key.data;
+  if (0 == key.size) {
+    k = NULL;
+  } else if (key.size < crypto_generichash_KEYBYTES_MIN ||
+             key.size > crypto_generichash_KEYBYTES_MAX) {
+    goto bad_arg;
+  }
+
+  // allocate memory for hash
+  if (!enif_alloc_binary(hash_size, &hash)) {
+    goto err;
+  }
+
+  // calculate hash
+  if (0 != crypto_generichash(hash.data, hash.size, message.data, message.size,
+                              k, key.size)) {
+    goto release;
+  }
+
+  ret = enif_make_binary(env, &hash);
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+release:
+  enif_release_binary(&hash);
+err:
+  ret = enacl_internal_error(env);
+done:
+  return ret;
+}
+
+ERL_NIF_TERM enacl_crypto_generichash_init(ErlNifEnv *env, int argc,
+                                           ERL_NIF_TERM const argv[]) {
+  ErlNifBinary key;
+  unsigned hash_size;
+  enacl_generichash_ctx *obj = NULL;
+  ERL_NIF_TERM ret;
+
+  // Validate the arguments
+  if (argc != 2)
+    goto bad_arg;
+  if (!enif_get_uint(env, argv[0], &hash_size))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &key))
+    goto bad_arg;
+
+  // Verify that hash size is valid
+  if ((hash_size < crypto_generichash_BYTES_MIN) ||
+      (hash_size > crypto_generichash_BYTES_MAX)) {
+    goto bad_arg;
+  }
+
+  // validate key size
+  unsigned char *k = key.data;
+  if (0 == key.size) {
+    k = NULL;
+  } else if (key.size < crypto_generichash_KEYBYTES_MIN ||
+             key.size > crypto_generichash_KEYBYTES_MAX) {
+    goto bad_arg;
+  }
+
+  // Create the resource
+  if ((obj = enif_alloc_resource(enacl_generic_hash_ctx_rtype,
+                                 sizeof(enacl_generichash_ctx))) == NULL) {
+    goto err;
+  }
+
+  // Allocate the state context via libsodium
+  // Note that this ensures a 64byte alignment for the resource
+  // And also protects the resource via guardpages
+  obj->mtx = NULL;
+  obj->ctx = NULL;
+  obj->alive = 0;
+  obj->outlen = 0;
+
+  obj->ctx = (crypto_generichash_state *)sodium_malloc(
+      crypto_generichash_statebytes());
+  if (obj->ctx == NULL) {
+    goto err;
+  }
+  obj->alive = 1;
+  obj->outlen = hash_size;
+
+  if ((obj->mtx = enif_mutex_create("enacl.generichash")) == NULL) {
+    ret = enacl_error_tuple(env, "mutex_create");
+    goto err;
+  }
+
+  // Call the library function
+  if (0 != crypto_generichash_init(obj->ctx, k, key.size, obj->outlen)) {
+    ret = enacl_error_tuple(env, "hash_init_error");
+    goto err;
+  }
+
+  ret = enif_make_resource(env, obj);
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+err:
+  ret = enacl_internal_error(env);
+  if (obj != NULL) {
+    if (obj->alive) {
+      sodium_free(obj->ctx);
+      obj->alive = 0; // Maintain the invariant consistently
+    }
+  }
+done:
+  if (obj != NULL) {
+    enif_release_resource(obj);
+  }
+  return ret;
+}
+
+ERL_NIF_TERM enacl_crypto_generichash_update(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]) {
+  ERL_NIF_TERM ret;
+  ErlNifBinary data;
+  enacl_generichash_ctx *obj = NULL;
+
+  // Validate the arguments
+  if (argc != 2)
+    goto bad_arg;
+  if (!enif_get_resource(env, argv[0],
+                         (ErlNifResourceType *)enacl_generic_hash_ctx_rtype,
+                         (void **)&obj))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &data))
+    goto bad_arg;
+
+  enif_mutex_lock(obj->mtx);
+  if (!obj->alive) {
+    goto err;
+  }
+
+  // Update hash state
+  if (0 != crypto_generichash_update(obj->ctx, data.data, data.size)) {
+    goto err;
+  }
+
+  ret = argv[0];
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+err:
+  ret = enacl_error_finalized(env);
+done:
+  enif_mutex_unlock(obj->mtx);
+  return ret;
+}
+
+ERL_NIF_TERM enacl_crypto_generichash_final(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  ERL_NIF_TERM ret;
+  ErlNifBinary hash;
+  enacl_generichash_ctx *obj = NULL;
+
+  if (argc != 1)
+    goto bad_arg;
+  if (!enif_get_resource(env, argv[0], enacl_generic_hash_ctx_rtype,
+                         (void **)&obj))
+    goto bad_arg;
+
+  enif_mutex_lock(obj->mtx);
+  if (!obj->alive) {
+    ret = enacl_error_finalized(env);
+    goto done;
+  }
+
+  if (!enif_alloc_binary(obj->outlen, &hash)) {
+    goto err;
+  }
+
+  if (0 != crypto_generichash_final(obj->ctx, hash.data, hash.size)) {
+    goto release;
+  }
+
+  // Finalize the object such that it cannot be reused by accident
+  if (obj->ctx)
+    sodium_free(obj->ctx);
+  obj->alive = 0;
+
+  ret = enif_make_binary(env, &hash);
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+release:
+  enif_release_binary(&hash);
+err:
+  ret = enacl_internal_error(env);
+done:
+  enif_mutex_unlock(obj->mtx);
+  return ret;
+}

c_src/generichash.h

@@ -0,0 +1,32 @@
+#ifndef ENACL_GENERICHASH_H
+#define ENACL_GENERICHASH_H
+
+#include <erl_nif.h>
+
+int enacl_init_generic_hash_ctx(ErlNifEnv *env);
+
+ERL_NIF_TERM enacl_crypto_generichash_BYTES(ErlNifEnv *env, int argc,
+                                            const ERL_NIF_TERM argv[]);
+ERL_NIF_TERM enacl_crypto_generichash_BYTES_MIN(ErlNifEnv *env, int argc,
+                                                const ERL_NIF_TERM argv[]);
+ERL_NIF_TERM enacl_crypto_generichash_BYTES_MAX(ErlNifEnv *env, int argc,
+                                                const ERL_NIF_TERM argv[]);
+
+ERL_NIF_TERM enacl_crypto_generichash_KEYBYTES(ErlNifEnv *env, int argc,
+                                               const ERL_NIF_TERM argv[]);
+ERL_NIF_TERM enacl_crypto_generichash_KEYBYTES_MIN(ErlNifEnv *env, int argc,
+                                                   const ERL_NIF_TERM argv[]);
+ERL_NIF_TERM enacl_crypto_generichash_KEYBYTES_MAX(ErlNifEnv *env, int argc,
+                                                   const ERL_NIF_TERM argv[]);
+
+ERL_NIF_TERM enacl_crypto_generichash(ErlNifEnv *env, int argc,
+                                      const ERL_NIF_TERM argv[]);
+
+ERL_NIF_TERM enacl_crypto_generichash_init(ErlNifEnv *env, int argc,
+                                           const ERL_NIF_TERM argv[]);
+ERL_NIF_TERM enacl_crypto_generichash_update(ErlNifEnv *env, int argc,
+                                             const ERL_NIF_TERM argv[]);
+ERL_NIF_TERM enacl_crypto_generichash_final(ErlNifEnv *env, int argc,
+                                            const ERL_NIF_TERM argv[]);
+
+#endif

c_src/hash.c

@@ -0,0 +1,62 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "hash.h"
+
+ERL_NIF_TERM enacl_crypto_shorthash_BYTES(ErlNifEnv *env, int argc,
+                                          ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_shorthash_BYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_shorthash_KEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_shorthash_KEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_shorthash(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]) {
+  ErlNifBinary a, m, k;
+
+  if ((argc != 2) || (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &k))) {
+    return enif_make_badarg(env);
+  }
+
+  if (k.size != crypto_shorthash_KEYBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_shorthash_BYTES, &a)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_shorthash(a.data, m.data, m.size, k.data);
+
+  return enif_make_binary(env, &a);
+}
+
+ERL_NIF_TERM enacl_crypto_hash(ErlNifEnv *env, int argc,
+                               ERL_NIF_TERM const argv[]) {
+  ErlNifBinary input;
+  ErlNifBinary result;
+  ERL_NIF_TERM ret;
+
+  if ((argc != 1) || (!enif_inspect_iolist_as_binary(env, argv[0], &input)))
+    goto bad_arg;
+
+  if (!enif_alloc_binary(crypto_hash_BYTES, &result))
+    goto err;
+
+  crypto_hash(result.data, input.data, input.size);
+  ret = enif_make_binary(env, &result);
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+err:
+  ret = enacl_internal_error(env);
+done:
+  return ret;
+}

c_src/hash.h

@@ -0,0 +1,17 @@
+#ifndef ENACL_HASH_H
+#define ENACL_HASH_H
+
+#include <erl_nif.h>
+
+ERL_NIF_TERM enacl_crypto_shorthash_BYTES(ErlNifEnv *env, int argc,
+                                          ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_shorthash_KEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_shorthash(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_hash(ErlNifEnv *env, int argc,
+                               const ERL_NIF_TERM argv[]);
+#endif

c_src/kdf.c

@@ -0,0 +1,59 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "kdf.h"
+
+
+ERL_NIF_TERM enacl_crypto_kdf_KEYBYTES(ErlNifEnv *env, int argc,
+                                       ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_kdf_KEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_kdf_CONTEXTBYTES(ErlNifEnv *env, int argc,
+                                       ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_kdf_CONTEXTBYTES);
+}
+
+
+ERL_NIF_TERM enacl_crypto_kdf_derive_from_key(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]) {
+  ErlNifBinary m, c, r;
+  ErlNifUInt64 id;
+
+  // Validate the arguments
+  if ((argc != 3) ||
+      (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &c)) ||
+      (!enif_get_uint64(env, argv[2], &id))) {
+    return enif_make_badarg(env);
+  }
+
+  // Check Master Key length
+  if (m.size != crypto_kdf_KEYBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  // Check Context Key length
+  if (c.size != crypto_kdf_CONTEXTBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  // Allocate memory for return binary
+  if (!enif_alloc_binary(crypto_kdf_KEYBYTES, &r)) {
+    return enacl_internal_error(env);
+  }
+
+  if (crypto_kdf_derive_from_key(r.data, r.size,
+                    id,
+                    (const char *)c.data,
+                    m.data) != 0) {
+    /* out of memory */
+    enif_release_binary(&r);
+    return enacl_internal_error(env);
+  }
+
+  return enif_make_binary(env, &r);
+}
+

c_src/kdf.h

@@ -0,0 +1,15 @@
+#ifndef ENACL_KDF_H
+#define ENACL_KDF_H
+
+#include <erl_nif.h>
+
+ERL_NIF_TERM enacl_crypto_kdf_KEYBYTES(ErlNifEnv *env, int argc,
+                                       ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_kdf_CONTEXTBYTES(ErlNifEnv *env, int argc,
+                                           ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_kdf_derive_from_key(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]);
+
+#endif

c_src/kx.c

@@ -0,0 +1,151 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "kx.h"
+
+/* Key exchange */
+
+ERL_NIF_TERM enacl_crypto_kx_SECRETKEYBYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_kx_SECRETKEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_kx_PUBLICKEYBYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_kx_PUBLICKEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_kx_SESSIONKEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_kx_SESSIONKEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_kx_keypair(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]) {
+  ErlNifBinary pk, sk;
+
+  if (argc != 0) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_kx_PUBLICKEYBYTES, &pk)) {
+    return enacl_internal_error(env);
+  }
+
+  if (!enif_alloc_binary(crypto_kx_SECRETKEYBYTES, &sk)) {
+    enif_release_binary(&pk);
+    return enacl_internal_error(env);
+  }
+
+  crypto_kx_keypair(pk.data, sk.data);
+
+  return enif_make_tuple2(env, enif_make_binary(env, &pk),
+                          enif_make_binary(env, &sk));
+}
+
+ERL_NIF_TERM
+enacl_crypto_kx_server_session_keys(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]) {
+  ERL_NIF_TERM ret;
+  ErlNifBinary rx, tx, server_pk, server_sk, client_pk;
+
+  if (argc != 3)
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[0], &server_pk))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &server_sk))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[2], &client_pk))
+    goto bad_arg;
+
+  if (server_pk.size != crypto_kx_PUBLICKEYBYTES)
+    goto bad_arg;
+  if (server_sk.size != crypto_kx_SECRETKEYBYTES)
+    goto bad_arg;
+  if (client_pk.size != crypto_kx_PUBLICKEYBYTES)
+    goto bad_arg;
+
+  if (!enif_alloc_binary(crypto_kx_SESSIONKEYBYTES, &rx)) {
+    ret = enacl_internal_error(env);
+    goto done;
+  }
+
+  if (!enif_alloc_binary(crypto_kx_SESSIONKEYBYTES, &tx)) {
+    ret = enacl_internal_error(env);
+    goto release_rx;
+  }
+
+  if (0 != crypto_kx_server_session_keys(rx.data, tx.data, server_pk.data,
+                                         server_sk.data, client_pk.data)) {
+    // suspicious client public key
+    ret = enacl_error_tuple(env, "invalid_client_public_key");
+    goto release_tx_rx;
+  }
+
+  ret = enif_make_tuple2(env, enif_make_binary(env, &rx),
+                         enif_make_binary(env, &tx));
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+release_tx_rx:
+  enif_release_binary(&tx);
+release_rx:
+  enif_release_binary(&rx);
+done:
+  return ret;
+}
+
+ERL_NIF_TERM
+enacl_crypto_kx_client_session_keys(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]) {
+  ErlNifBinary rx, tx, client_pk, client_sk, server_pk;
+  ERL_NIF_TERM ret;
+
+  if (argc != 3)
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[0], &client_pk))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &client_sk))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[2], &server_pk))
+    goto bad_arg;
+
+  if (client_pk.size != crypto_kx_PUBLICKEYBYTES)
+    goto bad_arg;
+  if (client_sk.size != crypto_kx_SECRETKEYBYTES)
+    goto bad_arg;
+  if (server_pk.size != crypto_kx_PUBLICKEYBYTES)
+    goto bad_arg;
+
+  if (!enif_alloc_binary(crypto_kx_SESSIONKEYBYTES, &rx)) {
+    ret = enacl_internal_error(env);
+    goto done;
+  }
+
+  if (!enif_alloc_binary(crypto_kx_SESSIONKEYBYTES, &tx)) {
+    ret = enacl_internal_error(env);
+    goto release_rx;
+  }
+
+  if (0 != crypto_kx_client_session_keys(rx.data, tx.data, client_pk.data,
+                                         client_sk.data, server_pk.data)) {
+    // suspicious server public key
+    ret = enacl_error_tuple(env, "invalid_server_public_key");
+    goto release_tx_rx;
+  }
+
+  ret = enif_make_tuple2(env, enif_make_binary(env, &rx),
+                         enif_make_binary(env, &tx));
+  goto done;
+bad_arg:
+  return enif_make_badarg(env);
+release_tx_rx:
+  enif_release_binary(&tx);
+release_rx:
+  enif_release_binary(&rx);
+done:
+  return ret;
+}

c_src/kx.h

@@ -0,0 +1,24 @@
+#ifndef ENACL_KX_H
+#define ENACL_KX_H
+
+#include <erl_nif.h>
+
+ERL_NIF_TERM enacl_crypto_kx_SECRETKEYBYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_kx_PUBLICKEYBYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_kx_SESSIONKEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_kx_keypair(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_kx_server_session_keys(ErlNifEnv *env, int argc,
+                                                 ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_kx_client_session_keys(ErlNifEnv *env, int argc,
+                                                 ERL_NIF_TERM const argv[]);
+
+#endif

c_src/public.c

@@ -0,0 +1,286 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "public.h"
+
+/* Public-key cryptography */
+ERL_NIF_TERM enacl_crypto_box_NONCEBYTES(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_box_NONCEBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_box_ZEROBYTES(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_box_ZEROBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_box_BOXZEROBYTES(ErlNifEnv *env, int argc,
+                                           ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_box_BOXZEROBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_box_PUBLICKEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_box_PUBLICKEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_box_SECRETKEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_box_SECRETKEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_box_BEFORENMBYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_box_BEFORENMBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_box_SEALBYTES(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_box_SEALBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_box_keypair(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]) {
+  ErlNifBinary pk, sk;
+
+  if (argc != 0) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_box_PUBLICKEYBYTES, &pk)) {
+    return enacl_error_tuple(env, "alloc_failed");
+  }
+
+  if (!enif_alloc_binary(crypto_box_SECRETKEYBYTES, &sk)) {
+    enif_release_binary(&pk);
+    return enacl_error_tuple(env, "alloc_failed");
+  }
+
+  crypto_box_keypair(pk.data, sk.data);
+
+  return enif_make_tuple2(env, enif_make_binary(env, &pk),
+                          enif_make_binary(env, &sk));
+}
+
+ERL_NIF_TERM enacl_crypto_box(ErlNifEnv *env, int argc,
+                              ERL_NIF_TERM const argv[]) {
+  ErlNifBinary padded_msg, nonce, pk, sk, result;
+  ERL_NIF_TERM ret;
+
+  if (argc != 4)
+    goto bad_arg;
+  if (!enif_inspect_iolist_as_binary(env, argv[0], &padded_msg))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &nonce))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[2], &pk))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[3], &sk))
+    goto bad_arg;
+
+  if (nonce.size != crypto_box_NONCEBYTES)
+    goto bad_arg;
+  if (pk.size != crypto_box_PUBLICKEYBYTES)
+    goto bad_arg;
+  if (sk.size != crypto_box_SECRETKEYBYTES)
+    goto bad_arg;
+  if (padded_msg.size < crypto_box_ZEROBYTES)
+    goto bad_arg;
+
+  if (!enif_alloc_binary(padded_msg.size, &result)) {
+    goto err;
+  }
+
+  if (0 != crypto_box(result.data, padded_msg.data, padded_msg.size, nonce.data,
+                      pk.data, sk.data)) {
+    goto release;
+  }
+
+  ret = enif_make_sub_binary(env, enif_make_binary(env, &result),
+                             crypto_box_BOXZEROBYTES,
+                             padded_msg.size - crypto_box_BOXZEROBYTES);
+
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+release:
+  enif_release_binary(&result);
+err:
+  ret = enacl_internal_error(env);
+done:
+  return ret;
+}
+
+ERL_NIF_TERM enacl_crypto_box_open(ErlNifEnv *env, int argc,
+                                   ERL_NIF_TERM const argv[]) {
+  ErlNifBinary padded_ciphertext, nonce, pk, sk, result;
+
+  if ((argc != 4) ||
+      (!enif_inspect_iolist_as_binary(env, argv[0], &padded_ciphertext)) ||
+      (!enif_inspect_binary(env, argv[1], &nonce)) ||
+      (!enif_inspect_binary(env, argv[2], &pk)) ||
+      (!enif_inspect_binary(env, argv[3], &sk))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((nonce.size != crypto_box_NONCEBYTES) ||
+      (pk.size != crypto_box_PUBLICKEYBYTES) ||
+      (sk.size != crypto_box_SECRETKEYBYTES) ||
+      (padded_ciphertext.size < crypto_box_BOXZEROBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(padded_ciphertext.size, &result)) {
+    return enacl_internal_error(env);
+  }
+
+  if (0 != crypto_box_open(result.data, padded_ciphertext.data,
+                           padded_ciphertext.size, nonce.data, pk.data,
+                           sk.data)) {
+    enif_release_binary(&result);
+    return enacl_error_tuple(env, "failed_verification");
+  }
+
+  ERL_NIF_TERM ret_ok = enif_make_atom(env, ATOM_OK);
+  ERL_NIF_TERM ret_bin = enif_make_sub_binary(
+      env, enif_make_binary(env, &result), crypto_box_ZEROBYTES,
+      padded_ciphertext.size - crypto_box_ZEROBYTES);
+
+  return enif_make_tuple2(env, ret_ok, ret_bin);
+}
+
+/* Precomputed crypto boxes */
+
+ERL_NIF_TERM enacl_crypto_box_beforenm(ErlNifEnv *env, int argc,
+                                       ERL_NIF_TERM const argv[]) {
+  ErlNifBinary k, pk, sk;
+
+  if ((argc != 2) || (!enif_inspect_binary(env, argv[0], &pk)) ||
+      (!enif_inspect_binary(env, argv[1], &sk)) ||
+      (pk.size != crypto_box_PUBLICKEYBYTES) ||
+      (sk.size != crypto_box_SECRETKEYBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_box_BEFORENMBYTES, &k)) {
+    goto err;
+  }
+
+  if (0 != crypto_box_beforenm(k.data, pk.data, sk.data)) {
+    // error
+    enif_release_binary(&k);
+    goto err;
+  }
+
+  return enif_make_binary(env, &k);
+err:
+  return enacl_internal_error(env);
+}
+
+ERL_NIF_TERM enacl_crypto_box_afternm(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]) {
+  ErlNifBinary result, m, nonce, k;
+
+  if ((argc != 3) || (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &nonce)) ||
+      (!enif_inspect_binary(env, argv[2], &k)) ||
+      (m.size < crypto_box_ZEROBYTES) ||
+      (nonce.size != crypto_box_NONCEBYTES) ||
+      (k.size != crypto_box_BEFORENMBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(m.size, &result)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_box_afternm(result.data, m.data, m.size, nonce.data, k.data);
+
+  return enif_make_sub_binary(env, enif_make_binary(env, &result),
+                              crypto_box_BOXZEROBYTES,
+                              m.size - crypto_box_BOXZEROBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_box_open_afternm(ErlNifEnv *env, int argc,
+                                           ERL_NIF_TERM const argv[]) {
+  ErlNifBinary result, m, nonce, k;
+
+  if ((argc != 3) || (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &nonce)) ||
+      (!enif_inspect_binary(env, argv[2], &k)) ||
+      (m.size < crypto_box_BOXZEROBYTES) ||
+      (nonce.size != crypto_box_NONCEBYTES) ||
+      (k.size != crypto_box_BEFORENMBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(m.size, &result)) {
+    return enacl_internal_error(env);
+  }
+
+  if (0 != crypto_box_open_afternm(result.data, m.data, m.size, nonce.data,
+                                   k.data)) {
+    enif_release_binary(&result);
+    return enacl_error_tuple(env, "failed_verification");
+  }
+
+  ERL_NIF_TERM ret_ok = enif_make_atom(env, ATOM_OK);
+  ERL_NIF_TERM ret_bin =
+      enif_make_sub_binary(env, enif_make_binary(env, &result),
+                           crypto_box_ZEROBYTES, m.size - crypto_box_ZEROBYTES);
+  return enif_make_tuple2(env, ret_ok, ret_bin);
+}
+
+/* Sealed box functions */
+
+ERL_NIF_TERM enacl_crypto_box_seal(ErlNifEnv *env, int argc,
+                                   ERL_NIF_TERM const argv[]) {
+  ErlNifBinary key, msg, ciphertext;
+
+  if ((argc != 2) || (!enif_inspect_iolist_as_binary(env, argv[0], &msg)) ||
+      (!enif_inspect_binary(env, argv[1], &key))) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(msg.size + crypto_box_SEALBYTES, &ciphertext)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_box_seal(ciphertext.data, msg.data, msg.size, key.data);
+
+  return enif_make_binary(env, &ciphertext);
+}
+
+ERL_NIF_TERM enacl_crypto_box_seal_open(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]) {
+  ErlNifBinary pk, sk, ciphertext, msg;
+
+  if ((argc != 3) ||
+      (!enif_inspect_iolist_as_binary(env, argv[0], &ciphertext)) ||
+      (!enif_inspect_binary(env, argv[1], &pk)) ||
+      (!enif_inspect_binary(env, argv[2], &sk))) {
+    return enif_make_badarg(env);
+  }
+
+  if (ciphertext.size < crypto_box_SEALBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(ciphertext.size - crypto_box_SEALBYTES, &msg)) {
+    return enacl_internal_error(env);
+  }
+
+  if (crypto_box_seal_open(msg.data, ciphertext.data, ciphertext.size, pk.data,
+                           sk.data) != 0) {
+    enif_release_binary(&msg);
+    return enacl_error_tuple(env, "failed_verification");
+  }
+
+  ERL_NIF_TERM ret_ok = enif_make_atom(env, ATOM_OK);
+  ERL_NIF_TERM ret_bin = enif_make_binary(env, &msg);
+
+  return enif_make_tuple2(env, ret_ok, ret_bin);
+}

c_src/public.h

@@ -0,0 +1,49 @@
+#ifndef ENACL_PUBLIC_H
+#define ENACL_PUBLIC_H
+
+ERL_NIF_TERM enacl_crypto_box_NONCEBYTES(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_ZEROBYTES(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_BOXZEROBYTES(ErlNifEnv *env, int argc,
+                                           ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_PUBLICKEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_SECRETKEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_BEFORENMBYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_keypair(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box(ErlNifEnv *env, int argc,
+                              ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_open(ErlNifEnv *env, int argc,
+                                   ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_beforenm(ErlNifEnv *env, int argc,
+                                       ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_afternm(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_open_afternm(ErlNifEnv *env, int argc,
+                                           ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_SEALBYTES(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_seal(ErlNifEnv *env, int argc,
+                                   ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_box_seal_open(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]);
+
+#endif

c_src/pwhash.c

@@ -0,0 +1,180 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "pwhash.h"
+
+static size_t enacl_pwhash_opslimit(ErlNifEnv *env, ERL_NIF_TERM arg) {
+  ERL_NIF_TERM a;
+  size_t r;
+
+  if (enif_is_atom(env, arg)) {
+    a = enif_make_atom(env, "interactive");
+    if (enif_is_identical(a, arg)) {
+      return crypto_pwhash_OPSLIMIT_INTERACTIVE;
+    }
+
+    a = enif_make_atom(env, "moderate");
+    if (enif_is_identical(a, arg)) {
+      return crypto_pwhash_OPSLIMIT_MODERATE;
+    }
+
+    a = enif_make_atom(env, "sensitive");
+    if (enif_is_identical(a, arg)) {
+      return crypto_pwhash_OPSLIMIT_SENSITIVE;
+    }
+  } else if (enif_get_ulong(env, arg, &r)) {
+    return r;
+  }
+
+  return 0;
+}
+
+static size_t enacl_pwhash_memlimit(ErlNifEnv *env, ERL_NIF_TERM arg) {
+  ERL_NIF_TERM a;
+  size_t r;
+
+  if (enif_is_atom(env, arg)) {
+    a = enif_make_atom(env, "interactive");
+    if (enif_is_identical(a, arg)) {
+      return crypto_pwhash_MEMLIMIT_INTERACTIVE;
+    }
+
+    a = enif_make_atom(env, "moderate");
+    if (enif_is_identical(a, arg)) {
+      return crypto_pwhash_MEMLIMIT_MODERATE;
+    }
+
+    a = enif_make_atom(env, "sensitive");
+    if (enif_is_identical(a, arg)) {
+      return crypto_pwhash_MEMLIMIT_SENSITIVE;
+    }
+  } else if (enif_get_ulong(env, arg, &r)) {
+    return r;
+  }
+
+  return 0;
+}
+
+ERL_NIF_TERM enacl_crypto_pwhash_SALTBYTES(ErlNifEnv *env, int argc,
+                                           ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_pwhash_SALTBYTES);
+}
+
+static int enacl_pwhash_alg(ErlNifEnv *env, ERL_NIF_TERM arg) {
+  ERL_NIF_TERM a;
+  int r;
+
+  if (enif_is_atom(env, arg)) {
+    a = enif_make_atom(env, "default");
+    if (enif_is_identical(a, arg)) {
+      return crypto_pwhash_ALG_DEFAULT;
+    }
+
+    a = enif_make_atom(env, "argon2i13");
+    if (enif_is_identical(a, arg)) {
+      return crypto_pwhash_ALG_ARGON2I13;
+    }
+
+    a = enif_make_atom(env, "argon2id13");
+    if (enif_is_identical(a, arg)) {
+      return crypto_pwhash_ALG_ARGON2ID13;
+    }
+  } else if (enif_get_int(env, arg, &r)) {
+    return r;
+  }
+
+  return 0;
+}
+
+ERL_NIF_TERM enacl_crypto_pwhash(ErlNifEnv *env, int argc,
+                                 ERL_NIF_TERM const argv[]) {
+  ErlNifBinary h, p, s;
+  size_t o, m;
+  int alg;
+
+  // Validate the arguments
+  if ((argc != 5) || (!enif_inspect_iolist_as_binary(env, argv[0], &p)) ||
+      (!enif_inspect_binary(env, argv[1], &s)) ||
+      !(o = enacl_pwhash_opslimit(env, argv[2])) ||
+      !(m = enacl_pwhash_memlimit(env, argv[3])) ||
+      !(alg = enacl_pwhash_alg(env, argv[4]))) {
+    return enif_make_badarg(env);
+  }
+
+  // Check limits
+  if ((o < crypto_pwhash_OPSLIMIT_MIN) || (o > crypto_pwhash_OPSLIMIT_MAX) ||
+      (m < crypto_pwhash_MEMLIMIT_MIN) || (m > crypto_pwhash_MEMLIMIT_MAX)) {
+    return enif_make_badarg(env);
+  }
+
+  // Check Salt size
+  if (s.size != crypto_pwhash_SALTBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  // Allocate memory for return binary
+  if (!enif_alloc_binary(crypto_box_SEEDBYTES, &h)) {
+    return enacl_internal_error(env);
+  }
+
+  if (crypto_pwhash(h.data, h.size, (char *)p.data, p.size, s.data, o, m,
+                    alg) != 0) {
+    /* out of memory */
+    enif_release_binary(&h);
+    return enacl_internal_error(env);
+  }
+
+  return enif_make_binary(env, &h);
+}
+
+ERL_NIF_TERM enacl_crypto_pwhash_str(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]) {
+  ErlNifBinary h, p;
+  size_t o, m;
+
+  // Validate the arguments
+  if ((argc != 3) || (!enif_inspect_iolist_as_binary(env, argv[0], &p)) ||
+      !(o = enacl_pwhash_opslimit(env, argv[1])) ||
+      !(m = enacl_pwhash_memlimit(env, argv[2]))) {
+    return enif_make_badarg(env);
+  }
+
+  // Check limits
+  if ((o < crypto_pwhash_OPSLIMIT_MIN) || (o > crypto_pwhash_OPSLIMIT_MAX) ||
+      (m < crypto_pwhash_MEMLIMIT_MIN) || (m > crypto_pwhash_MEMLIMIT_MAX)) {
+    return enif_make_badarg(env);
+  }
+
+  // Allocate memory for return binary
+  if (!enif_alloc_binary(crypto_pwhash_STRBYTES, &h)) {
+    return enacl_internal_error(env);
+  }
+
+  if (crypto_pwhash_str((char *)h.data, (char *)p.data, p.size, o, m) != 0) {
+    /* out of memory */
+    enif_release_binary(&h);
+    return enacl_internal_error(env);
+  }
+
+  return enif_make_binary(env, &h);
+}
+
+ERL_NIF_TERM enacl_crypto_pwhash_str_verify(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  ErlNifBinary h, p;
+  // Validate the arguments
+  if ((argc != 2) || (!enif_inspect_iolist_as_binary(env, argv[0], &h)) ||
+      (!enif_inspect_iolist_as_binary(env, argv[1], &p))) {
+    return enif_make_badarg(env);
+  }
+
+  ERL_NIF_TERM ret = enif_make_atom(env, ATOM_TRUE);
+  if (crypto_pwhash_str_verify((char *)h.data, (char *)p.data, p.size) != 0) {
+    /* wrong password */
+    ret = enif_make_atom(env, ATOM_FALSE);
+  }
+
+  return ret;
+}

c_src/pwhash.h

@@ -0,0 +1,18 @@
+#ifndef ENACL_PWHASH_H
+#define ENACL_PWHASH_H
+
+#include <erl_nif.h>
+
+ERL_NIF_TERM enacl_crypto_pwhash_SALTBYTES(ErlNifEnv *env, int argc,
+                                           ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_pwhash(ErlNifEnv *env, int argc,
+                                 ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_pwhash_str(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_pwhash_str_verify(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]);
+
+#endif

c_src/randombytes.c

@@ -0,0 +1,49 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "randombytes.h"
+
+ERL_NIF_TERM enif_randombytes(ErlNifEnv *env, int argc,
+                              ERL_NIF_TERM const argv[]) {
+  unsigned req_size;
+  ErlNifBinary result;
+
+  if ((argc != 1) || (!enif_get_uint(env, argv[0], &req_size))) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(req_size, &result)) {
+    return enacl_internal_error(env);
+  }
+
+  randombytes(result.data, result.size);
+
+  return enif_make_binary(env, &result);
+}
+
+ERL_NIF_TERM enif_randombytes_uint32(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]) {
+  ErlNifUInt64 result;
+
+  if (argc != 0) {
+    return enif_make_badarg(env);
+  }
+
+  result = randombytes_random();
+  return enif_make_uint64(env, result);
+}
+
+ERL_NIF_TERM enif_randombytes_uniform(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]) {
+  unsigned upper_bound;
+  ErlNifUInt64 result;
+
+  if ((argc != 1) || (!enif_get_uint(env, argv[0], &upper_bound))) {
+    return enif_make_badarg(env);
+  }
+
+  result = randombytes_uniform(upper_bound);
+  return enif_make_uint64(env, result);
+}

c_src/randombytes.h

@@ -0,0 +1,15 @@
+#ifndef ENACL_RANDOMBYTES_H
+#define ENACL_RANDOMBYTES_H
+
+#include <erl_nif.h>
+
+ERL_NIF_TERM enif_randombytes(ErlNifEnv *env, int argc,
+                              ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enif_randombytes_uint32(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enif_randombytes_uniform(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]);
+
+#endif

c_src/secret.c

@@ -0,0 +1,382 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "secret.h"
+
+/* Secret key cryptography */
+
+ERL_NIF_TERM
+enacl_crypto_secretbox_NONCEBYTES(ErlNifEnv *env, int argc,
+                                  ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_secretbox_NONCEBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_secretbox_KEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_secretbox_KEYBYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_secretbox_ZEROBYTES(ErlNifEnv *env, int argc,
+                                 ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_secretbox_ZEROBYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_secretbox_BOXZEROBYTES(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_secretbox_BOXZEROBYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_stream_chacha20_KEYBYTES(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_stream_chacha20_KEYBYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_stream_chacha20_NONCEBYTES(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_stream_chacha20_NONCEBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_stream_KEYBYTES(ErlNifEnv *env, int argc,
+                                          ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_stream_KEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_stream_NONCEBYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_stream_NONCEBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_auth_BYTES(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_auth_BYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_auth_KEYBYTES(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_auth_KEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_onetimeauth_BYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_onetimeauth_BYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_onetimeauth_KEYBYTES(ErlNifEnv *env, int argc,
+                                  ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_onetimeauth_KEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_secretbox(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]) {
+  ErlNifBinary key, nonce, padded_msg, padded_ciphertext;
+
+  if ((argc != 3) ||
+      (!enif_inspect_iolist_as_binary(env, argv[0], &padded_msg)) ||
+      (!enif_inspect_binary(env, argv[1], &nonce)) ||
+      (!enif_inspect_binary(env, argv[2], &key))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((key.size != crypto_secretbox_KEYBYTES) ||
+      (nonce.size != crypto_secretbox_NONCEBYTES) ||
+      (padded_msg.size < crypto_secretbox_ZEROBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(padded_msg.size, &padded_ciphertext)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_secretbox(padded_ciphertext.data, padded_msg.data, padded_msg.size,
+                   nonce.data, key.data);
+
+  return enif_make_sub_binary(env, enif_make_binary(env, &padded_ciphertext),
+                              crypto_secretbox_BOXZEROBYTES,
+                              padded_msg.size - crypto_secretbox_BOXZEROBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_secretbox_open(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]) {
+  ErlNifBinary key, nonce, padded_ciphertext, padded_msg;
+
+  if ((argc != 3) ||
+      (!enif_inspect_iolist_as_binary(env, argv[0], &padded_ciphertext)) ||
+      (!enif_inspect_binary(env, argv[1], &nonce)) ||
+      (!enif_inspect_binary(env, argv[2], &key))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((key.size != crypto_secretbox_KEYBYTES) ||
+      (nonce.size != crypto_secretbox_NONCEBYTES) ||
+      (padded_ciphertext.size < crypto_secretbox_BOXZEROBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(padded_ciphertext.size, &padded_msg)) {
+    return enacl_internal_error(env);
+  }
+
+  if (crypto_secretbox_open(padded_msg.data, padded_ciphertext.data,
+                            padded_ciphertext.size, nonce.data,
+                            key.data) != 0) {
+    enif_release_binary(&padded_msg);
+    return enacl_error_tuple(env, "failed_verification");
+  }
+
+  ERL_NIF_TERM ret_ok = enif_make_atom(env, ATOM_OK);
+  ERL_NIF_TERM ret_bin = enif_make_sub_binary(
+      env, enif_make_binary(env, &padded_msg), crypto_secretbox_ZEROBYTES,
+      padded_ciphertext.size - crypto_secretbox_ZEROBYTES);
+  return enif_make_tuple2(env, ret_ok, ret_bin);
+}
+
+ERL_NIF_TERM enacl_crypto_secretbox_easy(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]) {
+  ErlNifBinary key, nonce, msg, cipherbox;
+
+  if ((argc != 3) ||
+      (!enif_inspect_iolist_as_binary(env, argv[0], &msg)) ||
+      (!enif_inspect_binary(env, argv[1], &nonce)) ||
+      (!enif_inspect_binary(env, argv[2], &key))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((key.size != crypto_secretbox_KEYBYTES) ||
+      (nonce.size != crypto_secretbox_NONCEBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(msg.size + crypto_secretbox_MACBYTES, &cipherbox)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_secretbox_easy(cipherbox.data, msg.data, msg.size,
+                        nonce.data, key.data);
+
+  return enif_make_binary(env, &cipherbox);
+}
+
+ERL_NIF_TERM enacl_crypto_secretbox_open_easy(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]) {
+  ErlNifBinary key, nonce, cipherbox, msg;
+
+  if ((argc != 3) ||
+      (!enif_inspect_iolist_as_binary(env, argv[0], &cipherbox)) ||
+      (!enif_inspect_binary(env, argv[1], &nonce)) ||
+      (!enif_inspect_binary(env, argv[2], &key))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((key.size != crypto_secretbox_KEYBYTES) ||
+      (nonce.size != crypto_secretbox_NONCEBYTES) ||
+      (cipherbox.size < crypto_secretbox_MACBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(cipherbox.size - crypto_secretbox_MACBYTES, &msg)) {
+    return enacl_internal_error(env);
+  }
+
+  if (crypto_secretbox_open_easy(msg.data, cipherbox.data, cipherbox.size,
+                                 nonce.data, key.data) != 0) {
+    enif_release_binary(&msg);
+    return enacl_error_tuple(env, "failed_verification");
+  }
+
+  ERL_NIF_TERM ret_ok = enif_make_atom(env, ATOM_OK);
+  ERL_NIF_TERM ret_bin = enif_make_binary(env, &msg);
+  return enif_make_tuple2(env, ret_ok, ret_bin);
+}
+
+ERL_NIF_TERM enacl_crypto_stream_chacha20(ErlNifEnv *env, int argc,
+                                          ERL_NIF_TERM const argv[]) {
+  ErlNifBinary c, n, k;
+  ErlNifUInt64 clen;
+
+  if ((argc != 3) || (!enif_get_uint64(env, argv[0], &clen)) ||
+      (!enif_inspect_binary(env, argv[1], &n)) ||
+      (!enif_inspect_binary(env, argv[2], &k))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((k.size != crypto_stream_chacha20_KEYBYTES) ||
+      (n.size != crypto_stream_chacha20_NONCEBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(clen, &c)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_stream_chacha20(c.data, c.size, n.data, k.data);
+
+  return enif_make_binary(env, &c);
+}
+
+ERL_NIF_TERM
+enacl_crypto_stream_chacha20_xor(ErlNifEnv *env, int argc,
+                                 ERL_NIF_TERM const argv[]) {
+  ErlNifBinary c, m, n, k;
+
+  if ((argc != 3) || (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &n)) ||
+      (!enif_inspect_binary(env, argv[2], &k))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((k.size != crypto_stream_chacha20_KEYBYTES) ||
+      (n.size != crypto_stream_chacha20_NONCEBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(m.size, &c)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_stream_chacha20_xor(c.data, m.data, m.size, n.data, k.data);
+
+  return enif_make_binary(env, &c);
+}
+
+ERL_NIF_TERM enacl_crypto_stream(ErlNifEnv *env, int argc,
+                                 ERL_NIF_TERM const argv[]) {
+  ErlNifBinary c, n, k;
+  ErlNifUInt64 clen;
+
+  if ((argc != 3) || (!enif_get_uint64(env, argv[0], &clen)) ||
+      (!enif_inspect_binary(env, argv[1], &n)) ||
+      (!enif_inspect_binary(env, argv[2], &k))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((k.size != crypto_stream_KEYBYTES) ||
+      (n.size != crypto_stream_NONCEBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(clen, &c)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_stream(c.data, c.size, n.data, k.data);
+
+  return enif_make_binary(env, &c);
+}
+
+ERL_NIF_TERM enacl_crypto_stream_xor(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]) {
+  ErlNifBinary c, m, n, k;
+
+  if ((argc != 3) || (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &n)) ||
+      (!enif_inspect_binary(env, argv[2], &k))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((k.size != crypto_stream_KEYBYTES) ||
+      (n.size != crypto_stream_NONCEBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(m.size, &c)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_stream_xor(c.data, m.data, m.size, n.data, k.data);
+
+  return enif_make_binary(env, &c);
+}
+
+ERL_NIF_TERM enacl_crypto_auth(ErlNifEnv *env, int argc,
+                               ERL_NIF_TERM const argv[]) {
+  ErlNifBinary a, m, k;
+
+  if ((argc != 2) || (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &k))) {
+    return enif_make_badarg(env);
+  }
+
+  if (k.size != crypto_auth_KEYBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_auth_BYTES, &a)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_auth(a.data, m.data, m.size, k.data);
+
+  return enif_make_binary(env, &a);
+}
+
+ERL_NIF_TERM enacl_crypto_auth_verify(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]) {
+  ErlNifBinary a, m, k;
+
+  if ((argc != 3) || (!enif_inspect_binary(env, argv[0], &a)) ||
+      (!enif_inspect_iolist_as_binary(env, argv[1], &m)) ||
+      (!enif_inspect_binary(env, argv[2], &k))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((k.size != crypto_auth_KEYBYTES) || (a.size != crypto_auth_BYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (0 == crypto_auth_verify(a.data, m.data, m.size, k.data)) {
+    return enif_make_atom(env, "true");
+  } else {
+    return enif_make_atom(env, "false");
+  }
+}
+
+ERL_NIF_TERM enacl_crypto_onetimeauth(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]) {
+  ErlNifBinary a, m, k;
+
+  if ((argc != 2) || (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &k))) {
+    return enif_make_badarg(env);
+  }
+
+  if (k.size != crypto_onetimeauth_KEYBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_onetimeauth_BYTES, &a)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_onetimeauth(a.data, m.data, m.size, k.data);
+
+  return enif_make_binary(env, &a);
+}
+
+ERL_NIF_TERM enacl_crypto_onetimeauth_verify(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]) {
+  ErlNifBinary a, m, k;
+
+  if ((argc != 3) || (!enif_inspect_binary(env, argv[0], &a)) ||
+      (!enif_inspect_iolist_as_binary(env, argv[1], &m)) ||
+      (!enif_inspect_binary(env, argv[2], &k))) {
+    return enif_make_badarg(env);
+  }
+
+  if ((k.size != crypto_onetimeauth_KEYBYTES) ||
+      (a.size != crypto_onetimeauth_BYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (0 == crypto_onetimeauth_verify(a.data, m.data, m.size, k.data)) {
+    return enif_make_atom(env, "true");
+  } else {
+    return enif_make_atom(env, "false");
+  }
+}

c_src/secret.h

@@ -0,0 +1,76 @@
+#ifndef ENACL_SECRET_H
+#define ENACL_SECRET_H
+
+ERL_NIF_TERM enacl_crypto_secretbox_NONCEBYTES(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_secretbox_KEYBYTES(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_secretbox_ZEROBYTES(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_secretbox_BOXZEROBYTES(ErlNifEnv *env, int argc,
+                                                 ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_stream_chacha20_KEYBYTES(ErlNifEnv *env, int argc,
+                                                   ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_stream_chacha20_NONCEBYTES(ErlNifEnv *env, int argc,
+                                                     ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_stream_KEYBYTES(ErlNifEnv *env, int argc,
+                                          ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_stream_NONCEBYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_auth_BYTES(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_auth_KEYBYTES(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_onetimeauth_BYTES(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_onetimeauth_KEYBYTES(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_secretbox(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_secretbox_open(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_secretbox_easy(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_secretbox_open_easy(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_stream_chacha20(ErlNifEnv *env, int argc,
+                                          ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_stream_chacha20_xor(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_stream(ErlNifEnv *env, int argc,
+                                 ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_stream_xor(ErlNifEnv *env, int argc,
+                                     ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_auth(ErlNifEnv *env, int argc,
+                               ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_auth_verify(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_onetimeauth(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_onetimeauth_verify(ErlNifEnv *env, int argc,
+                                             ERL_NIF_TERM const argv[]);
+
+#endif

c_src/secretstream.c

@@ -0,0 +1,462 @@
+#include <erl_nif.h>
+#include <sodium.h>
+
+#include "enacl.h"
+#include "secretstream.h"
+
+typedef struct enacl_secretstream_ctx {
+  ErlNifMutex *mtx;
+  crypto_secretstream_xchacha20poly1305_state
+      *state; // The underlying secretstream state
+  int alive;  // Is the context still valid for updates/finalization
+} enacl_secretstream_ctx;
+
+ErlNifResourceType *enacl_secretstream_ctx_rtype = NULL;
+
+static void enacl_secretstream_ctx_dtor(ErlNifEnv *env,
+                                        enacl_secretstream_ctx *);
+
+int enacl_init_secretstream_ctx(ErlNifEnv *env) {
+  enacl_secretstream_ctx_rtype =
+      enif_open_resource_type(env, NULL, "enacl_secretstream_context",
+                              (ErlNifResourceDtor *)enacl_secretstream_ctx_dtor,
+                              ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER, NULL);
+
+  if (enacl_secretstream_ctx_rtype == NULL)
+    return 0;
+
+  return 1;
+}
+
+static void enacl_secretstream_ctx_dtor(ErlNifEnv *env,
+                                        enacl_secretstream_ctx *obj) {
+  if (!obj->alive) {
+    return;
+  }
+
+  if (obj->state)
+    sodium_memzero(obj->state,
+                   crypto_secretstream_xchacha20poly1305_statebytes());
+  enif_free(obj->state);
+
+  if (obj->mtx != NULL)
+    enif_mutex_destroy(obj->mtx);
+
+  return;
+}
+
+/*
+ * Secretstream
+ */
+
+ERL_NIF_TERM
+enacl_crypto_secretstream_xchacha20poly1305_ABYTES(ErlNifEnv *env, int argc,
+                                                   const ERL_NIF_TERM argv[]) {
+  return enif_make_int64(env, crypto_secretstream_xchacha20poly1305_ABYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_HEADERBYTES(
+    ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+  return enif_make_int64(env,
+                         crypto_secretstream_xchacha20poly1305_HEADERBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_KEYBYTES(
+    ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+  return enif_make_int64(env, crypto_secretstream_xchacha20poly1305_KEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX(
+    ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+  return enif_make_int64(
+      env, crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX);
+}
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_TAG_MESSAGE(
+    ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+
+  return enif_make_int64(env,
+                         crypto_secretstream_xchacha20poly1305_TAG_MESSAGE);
+}
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_TAG_PUSH(
+    ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+
+  return enif_make_int64(env, crypto_secretstream_xchacha20poly1305_TAG_PUSH);
+}
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_TAG_REKEY(
+    ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+
+  return enif_make_int64(env, crypto_secretstream_xchacha20poly1305_TAG_REKEY);
+}
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_TAG_FINAL(
+    ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+
+  return enif_make_int64(env, crypto_secretstream_xchacha20poly1305_TAG_FINAL);
+}
+
+ERL_NIF_TERM
+enacl_crypto_secretstream_xchacha20poly1305_keygen(ErlNifEnv *env, int argc,
+                                                   const ERL_NIF_TERM argv[]) {
+
+  ErlNifBinary key;
+
+  if (argc != 0) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_secretstream_xchacha20poly1305_KEYBYTES,
+                         &key)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_secretstream_xchacha20poly1305_keygen(key.data);
+
+  return enif_make_binary(env, &key);
+}
+
+/*
+   int crypto_secretstream_xchacha20poly1305_init_push
+      (crypto_secretstream_xchacha20poly1305_state *state,
+      unsigned char out[crypto_secretstream_xchacha20poly1305_HEADERBYTES],
+      const unsigned char k[crypto_secretstream_xchacha20poly1305_KEYBYTES])
+*/
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_init_push(
+    ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+  ERL_NIF_TERM ret;
+  ErlNifBinary key, header;
+  enacl_secretstream_ctx *obj = NULL;
+
+  if ((argc != 1) || (!enif_inspect_binary(env, argv[0], &key))) {
+    goto bad_arg;
+  }
+
+  if (key.size != crypto_secretstream_xchacha20poly1305_KEYBYTES) {
+    goto bad_arg;
+  }
+
+  if (!enif_alloc_binary(crypto_secretstream_xchacha20poly1305_HEADERBYTES,
+                         &header)) {
+    ret = enacl_internal_error(env);
+    goto done;
+  }
+
+  if ((obj = enif_alloc_resource(enacl_secretstream_ctx_rtype,
+                                 sizeof(enacl_secretstream_ctx))) == NULL) {
+    ret = enacl_internal_error(env);
+    goto release_header;
+  }
+  obj->alive = 0;
+  obj->state = enif_alloc(crypto_secretstream_xchacha20poly1305_statebytes());
+
+  if (obj->state == NULL) {
+    ret = enacl_internal_error(env);
+    goto release;
+  }
+  obj->alive = 1;
+
+  if ((obj->mtx = enif_mutex_create("enacl.secretstream")) == NULL) {
+    ret = enacl_internal_error(env);
+    goto free;
+  }
+
+  crypto_secretstream_xchacha20poly1305_init_push(obj->state, header.data,
+                                                  key.data);
+
+  ret = enif_make_tuple2(env, enif_make_binary(env, &header),
+                         enif_make_resource(env, obj));
+
+  goto release;
+bad_arg:
+  return enif_make_badarg(env);
+free:
+  if (obj->alive)
+    if (obj->state != NULL) {
+      sodium_memzero(obj->state,
+                     crypto_secretstream_xchacha20poly1305_statebytes());
+      enif_free(obj->state);
+      obj->state = NULL;
+    }
+release_header:
+  enif_release_binary(&header);
+release:
+  // This also frees the mutex via the destructor
+  enif_release_resource(obj);
+done:
+  return ret;
+}
+
+/*
+crypto_secretstream_xchacha20poly1305_init_pull
+   (crypto_secretstream_xchacha20poly1305_state *state,
+    const unsigned char in[crypto_secretstream_xchacha20poly1305_HEADERBYTES],
+    const unsigned char k[crypto_secretstream_xchacha20poly1305_KEYBYTES])
+*/
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_init_pull(
+    ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]) {
+  ERL_NIF_TERM ret;
+  ErlNifBinary header, key;
+  enacl_secretstream_ctx *obj = NULL;
+
+  if (argc != 2) {
+    goto bad_arg;
+  }
+
+  if (!enif_inspect_binary(env, argv[0], &header)) {
+    goto bad_arg;
+  }
+
+  if (!enif_inspect_binary(env, argv[1], &key)) {
+    goto bad_arg;
+  }
+
+  if ((key.size != crypto_secretstream_xchacha20poly1305_KEYBYTES) ||
+      (header.size != crypto_secretstream_xchacha20poly1305_HEADERBYTES)) {
+    goto bad_arg;
+  }
+
+  if ((obj = enif_alloc_resource(enacl_secretstream_ctx_rtype,
+                                 sizeof(enacl_secretstream_ctx))) == NULL) {
+    ret = enacl_internal_error(env);
+    goto done;
+  }
+
+  obj->alive = 0;
+  obj->state = enif_alloc(crypto_secretstream_xchacha20poly1305_statebytes());
+
+  if (obj->state == NULL) {
+    ret = enacl_internal_error(env);
+    goto release;
+  }
+  obj->alive = 1;
+
+  if ((obj->mtx = enif_mutex_create("enacl.secretstream")) == NULL) {
+    ret = enacl_internal_error(env);
+    goto free;
+  }
+
+  crypto_secretstream_xchacha20poly1305_init_pull(obj->state, header.data,
+                                                  key.data);
+
+  ret = enif_make_resource(env, obj);
+
+  goto release;
+
+bad_arg:
+  return enif_make_badarg(env);
+free:
+  if (obj->alive)
+    if (obj->state != NULL) {
+      sodium_memzero(obj->state,
+                     crypto_secretstream_xchacha20poly1305_statebytes());
+      enif_free(obj->state);
+      obj->state = NULL;
+    }
+release:
+  // This also frees the mutex via the destructor
+  enif_release_resource(obj);
+done:
+  return ret;
+}
+
+/*
+void
+crypto_secretstream_xchacha20poly1305_rekey
+    (crypto_secretstream_xchacha20poly1305_state *state)
+*/
+ERL_NIF_TERM
+enacl_crypto_secretstream_xchacha20poly1305_rekey(ErlNifEnv *env, int argc,
+                                                  const ERL_NIF_TERM argv[]) {
+  ERL_NIF_TERM ret;
+  enacl_secretstream_ctx *obj = NULL;
+
+  if (argc != 1) {
+    goto bad_arg;
+  }
+
+  if (!enif_get_resource(env, argv[0],
+                         (ErlNifResourceType *)enacl_secretstream_ctx_rtype,
+                         (void **)&obj)) {
+    goto bad_arg;
+  }
+
+  enif_mutex_lock(obj->mtx);
+  if (!obj->alive) {
+    goto err;
+  }
+
+  crypto_secretstream_xchacha20poly1305_rekey(obj->state);
+
+  ret = enif_make_atom(env, ATOM_OK);
+
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+err:
+  ret = enacl_error_finalized(env);
+done:
+  enif_mutex_unlock(obj->mtx);
+  return ret;
+}
+
+/*
+int
+crypto_secretstream_xchacha20poly1305_push
+   (crypto_secretstream_xchacha20poly1305_state *state,
+    unsigned char *out, unsigned long long *outlen_p,
+    const unsigned char *m, unsigned long long mlen,
+    const unsigned char *ad, unsigned long long adlen, unsigned char tag)
+*/
+ERL_NIF_TERM
+enacl_crypto_secretstream_xchacha20poly1305_push(ErlNifEnv *env, int argc,
+                                                 const ERL_NIF_TERM argv[]) {
+  ERL_NIF_TERM ret;
+  ErlNifBinary m, ad, out;
+  ErlNifUInt64 tag;
+  enacl_secretstream_ctx *obj = NULL;
+
+  if (argc != 4) {
+    goto bad_arg;
+  }
+
+  if (!enif_get_resource(env, argv[0],
+                         (ErlNifResourceType *)enacl_secretstream_ctx_rtype,
+                         (void **)&obj)) {
+    goto bad_arg;
+  }
+
+  if (!enif_inspect_binary(env, argv[1], &m)) {
+    goto bad_arg;
+  }
+
+  if (!enif_inspect_binary(env, argv[2], &ad)) {
+    goto bad_arg;
+  }
+
+  if (!enif_get_uint64(env, argv[3], &tag)) {
+    goto bad_arg;
+  }
+
+  if (!enif_alloc_binary(m.size + crypto_secretstream_xchacha20poly1305_ABYTES,
+                         &out)) {
+    return enacl_internal_error(env);
+  }
+
+  enif_mutex_lock(obj->mtx);
+  if (!obj->alive) {
+    goto err;
+  }
+
+  crypto_secretstream_xchacha20poly1305_push(obj->state, out.data, NULL, m.data,
+                                             m.size, ad.data, ad.size, tag);
+
+  if (tag == crypto_secretstream_xchacha20poly1305_TAG_FINAL) {
+    if (obj->state) {
+      obj->alive = 0;
+      sodium_memzero(obj->state,
+                     crypto_secretstream_xchacha20poly1305_statebytes());
+      enif_free(obj->state);
+      obj->state = NULL;
+    }
+  }
+
+  ret = enif_make_binary(env, &out);
+
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+err:
+  ret = enacl_error_finalized(env);
+  enif_release_binary(&out);
+done:
+  enif_mutex_unlock(obj->mtx);
+  return ret;
+}
+
+/*
+   crypto_secretstream_xchacha20poly1305_pull
+   (crypto_secretstream_xchacha20poly1305_state *state,
+   unsigned char *m, unsigned long long *mlen_p, unsigned char *tag_p,
+   const unsigned char *in, unsigned long long inlen,
+   const unsigned char *ad, unsigned long long adlen)
+   */
+ERL_NIF_TERM
+enacl_crypto_secretstream_xchacha20poly1305_pull(ErlNifEnv *env, int argc,
+                                                 const ERL_NIF_TERM argv[]) {
+  ERL_NIF_TERM ret;
+  ErlNifBinary m, in, ad;
+  unsigned char tag;
+  enacl_secretstream_ctx *obj = NULL;
+
+  if (argc != 3) {
+    goto bad_arg;
+  }
+
+  if (!enif_get_resource(env, argv[0],
+                         (ErlNifResourceType *)enacl_secretstream_ctx_rtype,
+                         (void **)&obj)) {
+    goto bad_arg;
+  }
+
+  if (!enif_inspect_binary(env, argv[1], &in)) {
+    goto bad_arg;
+  }
+
+  if (in.size < crypto_secretstream_xchacha20poly1305_ABYTES) {
+    goto bad_arg;
+  }
+
+  if (!enif_inspect_binary(env, argv[2], &ad)) {
+    goto bad_arg;
+  }
+
+  if (in.size < crypto_secretstream_xchacha20poly1305_ABYTES) {
+    goto bad_arg;
+  }
+
+  if (!enif_alloc_binary(in.size - crypto_secretstream_xchacha20poly1305_ABYTES,
+                         &m)) {
+    return enacl_internal_error(env);
+  }
+
+  enif_mutex_lock(obj->mtx);
+  if (!obj->alive) {
+    goto err;
+  }
+
+  if (0 != crypto_secretstream_xchacha20poly1305_pull(obj->state, m.data, NULL,
+                                                      &tag, in.data, in.size,
+                                                      ad.data, ad.size)) {
+    ret = enacl_error_tuple(env, "failed_verification");
+    goto release;
+  }
+
+  if (tag == crypto_secretstream_xchacha20poly1305_TAG_FINAL) {
+    if (obj->state) {
+      obj->alive = 0;
+      sodium_memzero(obj->state,
+                     crypto_secretstream_xchacha20poly1305_statebytes());
+      enif_free(obj->state);
+      obj->state = NULL;
+    }
+  }
+
+  ret = enif_make_tuple2(env, enif_make_binary(env, &m),
+                         enif_make_int64(env, tag));
+
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+err:
+  ret = enacl_error_finalized(env);
+release:
+  enif_release_binary(&m);
+done:
+  enif_mutex_unlock(obj->mtx);
+  return ret;
+}

c_src/secretstream.h

@@ -0,0 +1,78 @@
+#ifndef ENACL_SECRETSTREAM_H
+#define ENACL_SECRETSTREAM_H
+
+#include <erl_nif.h>
+
+int enacl_init_secretstream_ctx(ErlNifEnv *env);
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_ABYTES(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_HEADERBYTES(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_KEYBYTES(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_TAG_MESSAGE(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_TAG_PUSH(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_TAG_REKEY(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_TAG_FINAL(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_keygen(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_init_push(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_init_pull(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_rekey(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_push(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+ERL_NIF_TERM enacl_crypto_secretstream_xchacha20poly1305_pull(
+    ErlNifEnv *env, int argc,
+    const ERL_NIF_TERM argv[]
+    );
+
+#endif

c_src/sign.c

@@ -0,0 +1,488 @@
+#include <sodium.h>
+
+#include <erl_nif.h>
+
+#include "enacl.h"
+#include "sign.h"
+
+typedef struct enacl_sign_ctx {
+  ErlNifMutex *mtx;
+  crypto_sign_state *state; // The underlying signature state
+  int alive; // Is the context still valid for updates/finalization
+} enacl_sign_ctx;
+
+ErlNifResourceType *enacl_sign_ctx_rtype = NULL;
+
+void enacl_sign_ctx_dtor(ErlNifEnv *env, enacl_sign_ctx *);
+
+int enacl_init_sign_ctx(ErlNifEnv *env) {
+  enacl_sign_ctx_rtype =
+      enif_open_resource_type(env, NULL, "enacl_sign_context",
+                              (ErlNifResourceDtor *)enacl_sign_ctx_dtor,
+                              ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER, NULL);
+
+  if (enacl_sign_ctx_rtype == NULL)
+    return 0;
+
+  return 1;
+}
+
+void enacl_sign_ctx_dtor(ErlNifEnv *env, enacl_sign_ctx *obj) {
+  if (!obj->alive)
+    return;
+
+  if (obj->state) {
+    sodium_memzero(obj->state, crypto_sign_statebytes());
+    enif_free(obj->state);
+  }
+
+  if (obj->mtx != NULL)
+    enif_mutex_destroy(obj->mtx);
+
+  return;
+}
+
+/*
+  int crypto_sign_init(crypto_sign_state *state)
+ */
+
+ERL_NIF_TERM enacl_crypto_sign_init(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]) {
+  ERL_NIF_TERM ret;
+  enacl_sign_ctx *obj = NULL;
+
+  if (argc != 0)
+    goto bad_arg;
+
+  if ((obj = enif_alloc_resource(enacl_sign_ctx_rtype,
+                                 sizeof(enacl_sign_ctx))) == NULL) {
+    ret = enacl_internal_error(env);
+    goto done;
+  }
+  obj->alive = 0;
+  obj->state = enif_alloc(crypto_sign_statebytes());
+  if (obj->state == NULL) {
+    ret = enacl_internal_error(env);
+    goto release;
+  }
+  obj->alive = 1;
+
+  if ((obj->mtx = enif_mutex_create("enacl.sign")) == NULL) {
+    goto free;
+  }
+
+  if (0 != crypto_sign_init(obj->state)) {
+    goto free;
+  }
+
+  // Create return values
+  ret = enif_make_resource(env, obj);
+
+  goto release;
+
+bad_arg:
+  return enif_make_badarg(env);
+free:
+  ret = enacl_internal_error(env);
+  if (obj->alive)
+    if (obj->state != NULL) {
+      sodium_memzero(obj->state, crypto_sign_statebytes());
+      enif_free(obj->state);
+      obj->state = NULL;
+    }
+release:
+  // This also frees the mutex via the destructor
+  enif_release_resource(obj);
+done:
+  return ret;
+}
+
+/*
+  int crypto_sign_update(crypto_sign_state *state,
+                        const unsigned char *m,
+                        unsigned long long mlen);
+ */
+
+ERL_NIF_TERM enacl_crypto_sign_update(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]) {
+  ERL_NIF_TERM ret;
+  enacl_sign_ctx *obj = NULL;
+  ErlNifBinary data;
+
+  // Validate the arguments
+  if (argc != 2)
+    goto bad_arg;
+  if (!enif_get_resource(env, argv[0], enacl_sign_ctx_rtype, (void **)&obj))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &data))
+    goto bad_arg;
+
+  enif_mutex_lock(obj->mtx);
+  if (!obj->alive) {
+    ret = enacl_error_finalized(env);
+    goto done;
+  }
+
+  if (0 != crypto_sign_update(obj->state, data.data, data.size)) {
+    ret = enacl_internal_error(env); // This should never be hit
+    goto done;
+  }
+
+  ret = argv[0];
+  goto done;
+
+bad_arg:
+  return enif_make_badarg(env);
+done:
+  enif_mutex_unlock(obj->mtx);
+  return ret;
+}
+
+ERL_NIF_TERM enacl_crypto_sign_final_create(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  ERL_NIF_TERM ret;
+  enacl_sign_ctx *obj = NULL;
+  ErlNifBinary sk, sig;
+  unsigned long long siglen;
+
+  if (argc != 2)
+    goto bad_arg;
+  if (!enif_get_resource(env, argv[0], enacl_sign_ctx_rtype, (void **)&obj))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &sk))
+    goto bad_arg;
+  if (sk.size != crypto_sign_SECRETKEYBYTES)
+    goto bad_arg;
+
+  enif_mutex_lock(obj->mtx);
+  if (!obj->alive) {
+    ret = enacl_error_finalized(env);
+    goto done;
+  }
+
+  if (!enif_alloc_binary(crypto_sign_BYTES, &sig)) {
+    ret = enacl_internal_error(env);
+    goto done;
+  }
+
+  crypto_sign_final_create(obj->state, sig.data, &siglen, sk.data);
+
+  ERL_NIF_TERM ok = enif_make_atom(env, ATOM_OK);
+  ERL_NIF_TERM signature = enif_make_binary(env, &sig);
+
+  ret = enif_make_tuple2(env, ok, signature);
+  goto cleanup;
+
+bad_arg:
+  return enif_make_badarg(env);
+cleanup:
+  obj->alive = 0;
+  sodium_memzero(obj->state, crypto_sign_statebytes());
+  enif_free(obj->state);
+  obj->state = NULL;
+done:
+  enif_mutex_unlock(obj->mtx);
+  return ret;
+}
+
+ERL_NIF_TERM enacl_crypto_sign_final_verify(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  ErlNifBinary pk, sig;
+  enacl_sign_ctx *obj = NULL;
+  ERL_NIF_TERM ret;
+
+  if (argc != 3)
+    goto bad_arg;
+  if (!enif_get_resource(env, argv[0], enacl_sign_ctx_rtype, (void **)&obj))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[1], &sig))
+    goto bad_arg;
+  if (!enif_inspect_binary(env, argv[2], &pk))
+    goto bad_arg;
+  if (pk.size != crypto_sign_PUBLICKEYBYTES)
+    goto bad_arg;
+
+  enif_mutex_lock(obj->mtx);
+  if (!obj->alive) {
+    ret = enacl_error_finalized(env);
+    goto done;
+  }
+
+  if (0 == crypto_sign_final_verify(obj->state, sig.data, pk.data)) {
+    ret = enif_make_atom(env, "true");
+  } else {
+    ret = enif_make_atom(env, "false");
+  }
+  // Mark as done
+  goto cleanup;
+
+bad_arg:
+  return enif_make_badarg(env);
+cleanup:
+  // Get rid of the context and mark it as dead
+  obj->alive = 0;
+  sodium_memzero(obj->state, crypto_sign_statebytes());
+  enif_free(obj->state);
+  obj->state = NULL;
+done:
+  enif_mutex_unlock(obj->mtx);
+  return ret;
+}
+
+/* Ed 25519 */
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_keypair(ErlNifEnv *env, int argc,
+                                  ERL_NIF_TERM const argv[]) {
+  ErlNifBinary pk, sk;
+
+  if (argc != 0) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_sign_ed25519_PUBLICKEYBYTES, &pk)) {
+    return enacl_internal_error(env);
+  }
+
+  if (!enif_alloc_binary(crypto_sign_ed25519_SECRETKEYBYTES, &sk)) {
+    enif_release_binary(&pk);
+    return enacl_internal_error(env);
+  }
+
+  crypto_sign_ed25519_keypair(pk.data, sk.data);
+
+  return enif_make_tuple2(env, enif_make_binary(env, &pk),
+                          enif_make_binary(env, &sk));
+}
+
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_sk_to_pk(ErlNifEnv *env, int argc,
+                                   ERL_NIF_TERM const argv[]) {
+  ErlNifBinary pk, sk;
+
+  if ((argc != 1) || (!enif_inspect_binary(env, argv[0], &sk)) ||
+      (sk.size != crypto_sign_ed25519_SECRETKEYBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_sign_ed25519_PUBLICKEYBYTES, &pk)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_sign_ed25519_sk_to_pk(pk.data, sk.data);
+
+  return enif_make_binary(env, &pk);
+}
+
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_public_to_curve25519(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]) {
+  ErlNifBinary curve25519_pk, ed25519_pk;
+
+  if ((argc != 1) || (!enif_inspect_binary(env, argv[0], &ed25519_pk)) ||
+      (ed25519_pk.size != crypto_sign_ed25519_PUBLICKEYBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_scalarmult_curve25519_BYTES, &curve25519_pk)) {
+    return enacl_internal_error(env);
+  }
+
+  if (crypto_sign_ed25519_pk_to_curve25519(curve25519_pk.data, ed25519_pk.data) != 0) {
+    return enacl_internal_error(env);
+  }
+
+  return enif_make_binary(env, &curve25519_pk);
+}
+
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_secret_to_curve25519(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]) {
+  ErlNifBinary curve25519_sk, ed25519_sk;
+
+  if ((argc != 1) || (!enif_inspect_binary(env, argv[0], &ed25519_sk)) ||
+      (ed25519_sk.size != crypto_sign_ed25519_SECRETKEYBYTES)) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_scalarmult_curve25519_BYTES, &curve25519_sk)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_sign_ed25519_sk_to_curve25519(curve25519_sk.data, ed25519_sk.data);
+
+  return enif_make_binary(env, &curve25519_sk);
+}
+
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_PUBLICKEYBYTES(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_sign_ed25519_PUBLICKEYBYTES);
+}
+
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_SECRETKEYBYTES(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_sign_ed25519_SECRETKEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_sign_PUBLICKEYBYTES(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_sign_PUBLICKEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_sign_SECRETKEYBYTES(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_sign_SECRETKEYBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_sign_SEEDBYTES(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]) {
+  return enif_make_int64(env, crypto_sign_SEEDBYTES);
+}
+
+ERL_NIF_TERM enacl_crypto_sign_keypair(ErlNifEnv *env, int argc,
+                                       ERL_NIF_TERM const argv[]) {
+  ErlNifBinary pk, sk;
+
+  if (argc != 0) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_sign_PUBLICKEYBYTES, &pk)) {
+    return enacl_internal_error(env);
+  }
+
+  if (!enif_alloc_binary(crypto_sign_SECRETKEYBYTES, &sk)) {
+    enif_release_binary(&pk);
+    return enacl_internal_error(env);
+  }
+
+  crypto_sign_keypair(pk.data, sk.data);
+
+  return enif_make_tuple2(env, enif_make_binary(env, &pk),
+                          enif_make_binary(env, &sk));
+}
+
+ERL_NIF_TERM enacl_crypto_sign_seed_keypair(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]) {
+  ErlNifBinary pk, sk, seed;
+
+  if ((argc != 1) || (!enif_inspect_binary(env, argv[0], &seed))) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_sign_PUBLICKEYBYTES, &pk)) {
+    return enacl_internal_error(env);
+  }
+
+  if (!enif_alloc_binary(crypto_sign_SECRETKEYBYTES, &sk)) {
+    enif_release_binary(&pk);
+    return enacl_internal_error(env);
+  }
+
+  crypto_sign_seed_keypair(pk.data, sk.data, seed.data);
+
+  return enif_make_tuple2(env, enif_make_binary(env, &pk),
+                          enif_make_binary(env, &sk));
+}
+
+ERL_NIF_TERM enacl_crypto_sign(ErlNifEnv *env, int argc,
+                               ERL_NIF_TERM const argv[]) {
+  ErlNifBinary m, sk, sm;
+  unsigned long long smlen;
+
+  if ((argc != 2) || (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &sk))) {
+    return enif_make_badarg(env);
+  }
+
+  if (sk.size != crypto_sign_SECRETKEYBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(m.size + crypto_sign_BYTES, &sm)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_sign(sm.data, &smlen, m.data, m.size, sk.data);
+
+  return enif_make_sub_binary(env, enif_make_binary(env, &sm), 0, smlen);
+}
+
+ERL_NIF_TERM enacl_crypto_sign_open(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]) {
+  ErlNifBinary m, sm, pk;
+  unsigned long long mlen;
+
+  if ((argc != 2) || (!enif_inspect_iolist_as_binary(env, argv[0], &sm)) ||
+      (!enif_inspect_binary(env, argv[1], &pk))) {
+    return enif_make_badarg(env);
+  }
+
+  if (pk.size != crypto_sign_PUBLICKEYBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(sm.size, &m)) {
+    return enacl_internal_error(env);
+  }
+
+  if (0 == crypto_sign_open(m.data, &mlen, sm.data, sm.size, pk.data)) {
+    ERL_NIF_TERM ret_ok = enif_make_atom(env, ATOM_OK);
+    ERL_NIF_TERM ret_bin =
+        enif_make_sub_binary(env, enif_make_binary(env, &m), 0, mlen);
+    return enif_make_tuple2(env, ret_ok, ret_bin);
+  } else {
+    enif_release_binary(&m);
+    return enacl_error_tuple(env, "failed_verification");
+  }
+}
+
+ERL_NIF_TERM enacl_crypto_sign_detached(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]) {
+  ErlNifBinary m, sk, sig;
+  unsigned long long siglen;
+
+  if ((argc != 2) || (!enif_inspect_iolist_as_binary(env, argv[0], &m)) ||
+      (!enif_inspect_binary(env, argv[1], &sk))) {
+    return enif_make_badarg(env);
+  }
+
+  if (sk.size != crypto_sign_SECRETKEYBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  if (!enif_alloc_binary(crypto_sign_BYTES, &sig)) {
+    return enacl_internal_error(env);
+  }
+
+  crypto_sign_detached(sig.data, &siglen, m.data, m.size, sk.data);
+
+  return enif_make_binary(env, &sig);
+}
+
+ERL_NIF_TERM
+enacl_crypto_sign_verify_detached(ErlNifEnv *env, int argc,
+                                  ERL_NIF_TERM const argv[]) {
+  ErlNifBinary m, sig, pk;
+
+  if ((argc != 3) || (!enif_inspect_binary(env, argv[0], &sig)) ||
+      (!enif_inspect_iolist_as_binary(env, argv[1], &m)) ||
+      (!enif_inspect_binary(env, argv[2], &pk))) {
+    return enif_make_badarg(env);
+  }
+
+  if (sig.size != crypto_sign_BYTES) {
+    return enif_make_badarg(env);
+  }
+
+  if (pk.size != crypto_sign_PUBLICKEYBYTES) {
+    return enif_make_badarg(env);
+  }
+
+  if (0 == crypto_sign_verify_detached(sig.data, m.data, m.size, pk.data)) {
+    return enif_make_atom(env, ATOM_TRUE);
+  } else {
+    return enif_make_atom(env, ATOM_FALSE);
+  }
+}

c_src/sign.h

@@ -0,0 +1,70 @@
+#ifndef ENACL_SIGN_H
+#define ENACL_SIGN_H
+
+#include <erl_nif.h>
+
+int enacl_init_sign_ctx(ErlNifEnv *env);
+
+ERL_NIF_TERM enacl_crypto_sign_init(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_update(ErlNifEnv *env, int argc,
+                                      ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_final_create(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_final_verify(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_ed25519_keypair(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_ed25519_sk_to_pk(ErlNifEnv *env, int argc,
+                                                ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_public_to_curve25519(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_secret_to_curve25519(ErlNifEnv *env, int argc,
+                                               ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_PUBLICKEYBYTES(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM
+enacl_crypto_sign_ed25519_SECRETKEYBYTES(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_PUBLICKEYBYTES(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_SECRETKEYBYTES(ErlNifEnv *env, int argc,
+                                              ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_SEEDBYTES(ErlNifEnv *env, int argc,
+                                         ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_keypair(ErlNifEnv *env, int argc,
+                                       ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_seed_keypair(ErlNifEnv *env, int argc,
+                                            ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign(ErlNifEnv *env, int argc,
+                               ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_open(ErlNifEnv *env, int argc,
+                                    ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM enacl_crypto_sign_detached(ErlNifEnv *env, int argc,
+                                        ERL_NIF_TERM const argv[]);
+
+ERL_NIF_TERM
+enacl_crypto_sign_verify_detached(ErlNifEnv *env, int argc,
+                                  ERL_NIF_TERM const argv[]);
+
+#endif

eqc_test/enacl_eqc.erl

@@ -1,6 +1,6 @@
 -module(enacl_eqc).
 -include_lib("eqc/include/eqc.hrl").
--compile(export_all).
+-compile([export_all, nowarn_export_all]).
 
 -ifndef(mini).
 -compile({parse_transform, eqc_parallelize}).
@@ -83,8 +83,8 @@ v_binary(_, _) -> false.
 
 
 %% Typical generators based on the binaries
-nonce() -> g_binary(enacl:box_nonce_size()).
-nonce_valid(N) -> v_binary(enacl:box_nonce_size(), N).
+nonce() -> g_binary(enacl:box_NONCEBYTES()).
+nonce_valid(N) -> v_binary(enacl:box_NONCEBYTES(), N).
 
 %% Generator of natural numbers
 g_nat() ->
@@ -111,10 +111,10 @@ keypair_bad() ->
         #{ public := PK, secret := SK} = enacl:box_keypair(),
         case X of
             pk ->
-              PKBytes = enacl:box_public_key_bytes(),
+              PKBytes = enacl:box_PUBLICKEYBYTES(),
               {oneof([return(a), nat(), ?SUCHTHAT(B, binary(), byte_size(B) /= PKBytes)]), SK};
             sk ->
-              SKBytes = enacl:box_secret_key_bytes(),
+              SKBytes = enacl:box_SECRETKEYBYTES(),
               {PK, oneof([return(a), nat(), ?SUCHTHAT(B, binary(), byte_size(B) /= SKBytes)])}
         end
       end).
@@ -122,6 +122,35 @@ keypair_bad() ->
 keypair() ->
     ?FAULT(keypair_bad(), keypair_good()).
 
+kx_keypair_good() ->
+  #{ public := PK, secret := SK} = enacl:kx_keypair(),
+  {PK, SK}.
+
+kx_keypair_bad() ->
+  ?LET(X, elements([pk, sk]),
+  begin
+    #{ public := PK, secret := SK} = enacl:box_keypair(),
+    case X of
+      pk ->
+        PKBytes = enacl:kx_public_key_size(),
+        {oneof([return(a), nat(), ?SUCHTHAT(B, binary(), byte_size(B) /= PKBytes)]), SK};
+      sk ->
+        SKBytes = enacl:kx_secret_key_size(),
+        {PK, oneof([return(a), nat(), ?SUCHTHAT(B, binary(), byte_size(B) /= SKBytes)])}
+    end
+  end).
+
+g_generichash_data() ->
+  binary().
+
+g_generichash_key() ->
+  ?LET({Min, Max}, {return(enacl_nif:crypto_generichash_KEYBYTES_MIN()), return(enacl_nif:crypto_generichash_KEYBYTES_MAX())},
+    largebinary({limit, Min, Max})).
+
+g_generichash_size() ->
+  ?LET({Min, Max}, {return(enacl_nif:crypto_generichash_BYTES_MIN()), return(enacl_nif:crypto_generichash_BYTES_MAX())},
+    choose(Min, Max)).
+
 %% CRYPTO BOX
 %% ---------------------------
 %% * box/4
@@ -130,8 +159,8 @@ keypair() ->
 %% * box_afternm/3
 %% * box_open_afternm/3
 keypair_valid(PK, SK) when is_binary(PK), is_binary(SK) ->
-    PKBytes = enacl:box_public_key_bytes(),
-    SKBytes = enacl:box_secret_key_bytes(),
+    PKBytes = enacl:box_PUBLICKEYBYTES(),
+    SKBytes = enacl:box_SECRETKEYBYTES(),
     byte_size(PK) == PKBytes andalso byte_size(SK) == SKBytes;
 keypair_valid(_PK, _SK) -> false.
 
@@ -235,11 +264,11 @@ beforenm_key() ->
                 oneof([
                   elements([a,b,c]),
                   real(),
-                  ?SUCHTHAT(X, binary(), byte_size(X) /= enacl:box_beforenm_bytes())
+                  ?SUCHTHAT(X, binary(), byte_size(X) /= enacl:box_BEFORENMBYTES())
                   ])
         end).
 
-v_key(K) when is_binary(K) -> byte_size(K) == enacl:box_beforenm_bytes();
+v_key(K) when is_binary(K) -> byte_size(K) == enacl:box_BEFORENMBYTES();
 v_key(_) -> false.
 
 prop_beforenm_correct() ->
@@ -295,11 +324,11 @@ sign_keypair_bad() ->
       KP = enacl:sign_keypair(),
       case X of
         pk ->
-          Sz = enacl:sign_keypair_public_size(),
+          Sz = enacl:sign_PUBLICBYTES(),
           ?LET(Wrong, oneof([a, int(), ?SUCHTHAT(B, binary(), byte_size(B) /= Sz)]),
             KP#{ public := Wrong });
         sk ->
-          Sz = enacl:sign_keypair_secret_size(),
+          Sz = enacl:sign_SECRETBYTES(),
           ?LET(Wrong, oneof([a, int(), ?SUCHTHAT(B, binary(), byte_size(B) /= Sz)]),
             KP#{ secret := Wrong })
       end
@@ -313,12 +342,12 @@ sign_keypair() ->
 
 sign_keypair_public_valid(#{ public := Public })
   when is_binary(Public) ->
-    byte_size(Public) == enacl:sign_keypair_public_size();
+    byte_size(Public) == enacl:sign_PUBLICBYTES();
 sign_keypair_public_valid(_) -> false.
 
 sign_keypair_secret_valid(#{ secret := Secret })
   when is_binary(Secret) ->
-    byte_size(Secret) == enacl:sign_keypair_secret_size();
+    byte_size(Secret) == enacl:sign_SECRETBYTES();
 sign_keypair_secret_valid(_) -> false.
 
 sign_keypair_valid(KP) ->
@@ -379,18 +408,18 @@ signed_message_good_d(M) ->
                end)}]).
 
 signed_message_bad() ->
-    Sz = enacl:sign_keypair_public_size(),
+    Sz = enacl:sign_PUBLICBYTES(),
     {binary(), oneof([a, int(), ?SUCHTHAT(B, binary(Sz), byte_size(B) /= Sz)])}.
 
 signed_message_bad_d() ->
-    Sz = enacl:sign_keypair_public_size(),
+    Sz = enacl:sign_PUBLICBYTES(),
     {binary(), oneof([a, int(), ?SUCHTHAT(B, binary(Sz), byte_size(B) /= Sz)])}.
 
 signed_message(M) ->
     ?FAULT(signed_message_bad(), signed_message_good(M)).
 
 signed_message_d(M) ->
-    ?FAULT(signed_message_bad(), signed_message_good(M)).
+    ?FAULT(signed_message_bad_d(), signed_message_good_d(M)).
 
 signed_message_valid({valid, _}, _) -> true;
 signed_message_valid({invalid, _}, _) -> true;
@@ -403,9 +432,9 @@ prop_sign_detached_open() ->
               true ->
                   case SignMsg of
                     {valid, Sig} ->
-                        equals({ok, Msg}, enacl:sign_verify_detached(Sig, Msg, PK));
+                        equals(true, enacl:sign_verify_detached(Sig, Msg, PK));
                     {invalid, Sig} ->
-                        equals({error, failed_verification}, enacl:sign_verify_detached(Sig, Msg, PK))
+                        equals(false, enacl:sign_verify_detached(Sig, Msg, PK))
                   end;
               false ->
                   badargs(fun() -> enacl:sign_verify_detached(SignMsg, Msg, PK) end)
@@ -467,19 +496,19 @@ prop_seal_box_correct() ->
 %% * secretbox/3
 %% * secretbo_open/3
 secret_key_good() ->
-	Sz = enacl:secretbox_key_size(),
+	Sz = enacl:secretbox_KEYBYTES(),
 	binary(Sz).
 
 secret_key_bad() ->
 	oneof([return(a),
 	       nat(),
-	       ?SUCHTHAT(B, binary(), byte_size(B) /= enacl:secretbox_key_size())]).
+	       ?SUCHTHAT(B, binary(), byte_size(B) /= enacl:secretbox_KEYBYTES())]).
 
 secret_key() ->
 	?FAULT(secret_key_bad(), secret_key_good()).
 
 secret_key_valid(SK) when is_binary(SK) ->
-	Sz = enacl:secretbox_key_size(),
+	Sz = enacl:secretbox_KEYBYTES(),
 	byte_size(SK) == Sz;
 secret_key_valid(_SK) -> false.
 
@@ -521,24 +550,87 @@ prop_secretbox_failure_integrity() ->
         equals(Err, {error, failed_verification})
       end).
 
+secretbox_easy(Msg, Nonce, Key) ->
+  try enacl:secretbox_easy(Msg, Nonce, Key)
+  catch error:badarg -> badarg
+  end.
+
+secretbox_open_easy(Msg, Nonce, Key) ->
+  try enacl:secretbox_open_easy(Msg, Nonce, Key)
+  catch error:badarg -> badarg
+  end.
+
+prop_secretbox_easy_correct() ->
+    ?FORALL({Msg, Nonce, Key},
+            {?FAULT_RATE(1, 40, g_iodata()),
+             ?FAULT_RATE(1, 40, nonce()),
+             ?FAULT_RATE(1, 40, secret_key())},
+      begin
+        case v_iodata(Msg) andalso nonce_valid(Nonce) andalso secret_key_valid(Key) of
+          true ->
+             CipherText = enacl:secretbox_easy(Msg, Nonce, Key),
+             {ok, DecodedMsg} = enacl:secretbox_open_easy(CipherText, Nonce, Key),
+             equals(iolist_to_binary(Msg), DecodedMsg);
+          false ->
+             case secretbox_easy(Msg, Nonce, Key) of
+               badarg -> true;
+               Res ->
+                 failure(secretbox_open_easy(Res, Nonce, Key))
+             end
+        end
+      end).
+
+prop_secretbox_easy_failure_integrity() ->
+    ?FORALL({Msg, Nonce, Key}, {g_iodata(), nonce(), secret_key()},
+      begin
+        CipherText = enacl:secretbox_easy(Msg, Nonce, Key),
+        Err = enacl:secretbox_open_easy([<<"x">>, CipherText], Nonce, Key),
+        equals(Err, {error, failed_verification})
+      end).
+
 %% AEAD ChaCha20Poly1305
 %% ------------------------------------------------------------
 %% * aead_chacha20poly1305_encrypt/4,
 %% * aead_chacha20poly1305_decrypt/4,
-prop_aead_chacha20poly1305() ->
+prop_aead_chacha20poly1305_ietf() ->
+  NPubBytes = enacl:aead_chacha20poly1305_ietf_NPUBBYTES(),
   ?FORALL({Key, Msg, AD, Nonce},
-          {binary(32), binary(), ?LET(ADBytes, choose(0,16), binary(ADBytes)), largeint()},
+          {binary(32), binary(), ?LET(ADBytes, choose(0,16), binary(ADBytes)), binary(NPubBytes)},
   begin
-    EncryptMsg = enacl:aead_chacha20poly1305_encrypt(Key, Nonce, AD, Msg),
-    equals(enacl:aead_chacha20poly1305_decrypt(Key, Nonce, AD, EncryptMsg), Msg)
+    EncryptMsg = enacl:aead_chacha20poly1305_ietf_encrypt(Msg, AD, Nonce, Key),
+    equals(enacl:aead_chacha20poly1305_ietf_decrypt(EncryptMsg, AD, Nonce, Key), Msg)
   end).
 
-prop_aead_chacha20poly1305_fail() ->
+prop_aead_chacha20poly1305_ietf_fail() ->
+  NPubBytes = enacl:aead_chacha20poly1305_ietf_NPUBBYTES(),
   ?FORALL({Key, Msg, AD, Nonce},
-          {binary(32), binary(), ?LET(ADBytes, choose(0,16), binary(ADBytes)), largeint()},
+          {binary(32), binary(), ?LET(ADBytes, choose(0,16), binary(ADBytes)), binary(NPubBytes)},
   begin
-    EncryptMsg = enacl:aead_chacha20poly1305_encrypt(Key, Nonce, AD, Msg),
-    case enacl:aead_chacha20poly1305_decrypt(Key, Nonce, AD, <<0:8, EncryptMsg/binary>>) of
+    EncryptMsg = enacl:aead_chacha20poly1305_ietf_encrypt(Msg, AD, Nonce, Key),
+    case enacl:aead_chacha20poly1305_ietf_decrypt(<<0:8, EncryptMsg/binary>>, AD, Nonce, Key) of
+        {error, _} -> true;
+        _          -> false
+    end
+  end).
+
+%% * aead_xchacha20poly1305_encrypt/4,
+%% * aead_xchacha20poly1305_decrypt/4,
+prop_aead_xchacha20poly1305_ietf() ->
+  NPubBytes = enacl:aead_xchacha20poly1305_ietf_NPUBBYTES(),
+  ?FORALL({Key, Msg, AD, Nonce},
+          {binary(32), binary(), ?LET(ADBytes, choose(0,16), binary(ADBytes)), binary(NPubBytes)},
+  begin
+    EncryptMsg = enacl:aead_xchacha20poly1305_ietf_encrypt(Msg, AD, Nonce, Key),
+    equals(enacl:aead_xchacha20poly1305_ietf_decrypt(EncryptMsg, AD, Nonce, Key), Msg)
+  end).
+
+prop_aead_xchacha20poly1305_ietf_fail() ->
+  NPubBytes = enacl:aead_xchacha20poly1305_ietf_NPUBBYTES(),
+  ?FORALL({Key, Msg, AD, Nonce},
+          {binary(32), binary(), ?LET(ADBytes, choose(0,16), binary(ADBytes)), binary(NPubBytes)},
+  begin
+    EncryptMsg = enacl:aead_xchacha20poly1305_ietf_encrypt(Msg, AD, Nonce, Key),
+    case enacl:aead_xchacha20poly1305_ietf_decrypt(<<0:8, EncryptMsg/binary>>, AD, Nonce, Key) of
         {error, _} -> true;
         _          -> false
     end
@@ -564,23 +656,26 @@ xor_bytes(<<A, As/binary>>, <<B, Bs/binary>>) ->
     [A bxor B | xor_bytes(As, Bs)];
 xor_bytes(<<>>, <<>>) -> [].
 
-%% prop_stream_xor_correct() ->
-%%     ?FORALL({Msg, Nonce, Key},
-%%             {?FAULT_RATE(1, 40, g_iodata()),
-%%              ?FAULT_RATE(1, 40, nonce()),
-%%              ?FAULT_RATE(1, 40, secret_key())},
-%%         case v_iodata(Msg) andalso nonce_valid(Nonce) andalso secret_key_valid(Key) of
-%%             true ->
-%%                 Stream = enacl:stream(iolist_size(Msg), Nonce, Key),
-%%                 CipherText = enacl:stream_xor(Msg, Nonce, Key),
-%%                 StreamXor = enacl:stream_xor(CipherText, Nonce, Key),
-%%                 conjunction([
-%%                     {'xor', equals(iolist_to_binary(Msg), StreamXor)},
-%%                     {stream, equals(iolist_to_binary(xor_bytes(Stream, iolist_to_binary(Msg))), CipherText)}
-%%                 ]);
-%%             false ->
-%%                 badargs(fun() -> enacl:stream_xor(Msg, Nonce, Key) end)
-%%         end).
+positive() ->
+  ?LET(N, nat(), N+1).
+
+chacha20_nonce() ->
+  Sz = enacl:stream_chacha20_NONCEBYTES(),
+  binary(Sz).
+
+chacha20_key() ->
+  Sz = enacl:stream_chacha20_KEYBYTES(),
+  binary(Sz).
+
+prop_stream_chacha20_correct() ->
+  ?FORALL(Len, positive(),
+    ?FORALL({Msg, Nonce, Key}, {binary(Len), chacha20_nonce(), chacha20_key()},
+      begin
+        CT = enacl:stream_chacha20_xor(Msg, Nonce, Key),
+        Stream = enacl:stream_chacha20(Len, Nonce, Key),
+        CT2 = list_to_binary(xor_bytes(Stream, Msg)),
+        equals(CT, CT2)
+      end)).
 
 %% CRYPTO AUTH
 %% ------------------------------------------------------------
@@ -599,19 +694,19 @@ prop_auth_correct() ->
        end).
 
 authenticator_bad() ->
-    oneof([a, int(), ?SUCHTHAT(X, binary(), byte_size(X) /= enacl:auth_size())]).
+    oneof([a, int(), ?SUCHTHAT(X, binary(), byte_size(X) /= enacl:auth_BYTES())]).
 
 authenticator_good(Msg, Key) when is_binary(Key) ->
-    Sz = enacl:secretbox_key_size(),
+    Sz = enacl:secretbox_KEYBYTES(),
     case v_iodata(Msg) andalso byte_size(Key) == Sz of
       true ->
-        frequency([{1, ?LAZY({invalid, binary(enacl:auth_size())})},
+        frequency([{1, ?LAZY({invalid, binary(enacl:auth_BYTES())})},
                    {3, return({valid, enacl:auth(Msg, Key)})}]);
       false ->
-        binary(enacl:auth_size())
+        binary(enacl:auth_BYTES())
     end;
 authenticator_good(_Msg, _Key) ->
-    binary(enacl:auth_size()).
+    binary(enacl:auth_BYTES()).
 
 authenticator(Msg, Key) ->
   ?FAULT(authenticator_bad(), authenticator_good(Msg, Key)).
@@ -654,19 +749,19 @@ prop_onetimeauth_correct() ->
        end).
 
 ot_authenticator_bad() ->
-    oneof([a, int(), ?SUCHTHAT(X, binary(), byte_size(X) /= enacl:onetime_auth_size())]).
+    oneof([a, int(), ?SUCHTHAT(X, binary(), byte_size(X) /= enacl:onetime_auth_BYTES())]).
 
 ot_authenticator_good(Msg, Key) when is_binary(Key) ->
-    Sz = enacl:secretbox_key_size(),
+    Sz = enacl:secretbox_KEYBYTES(),
     case v_iodata(Msg) andalso byte_size(Key) == Sz of
       true ->
-        frequency([{1, ?LAZY({invalid, binary(enacl:onetime_auth_size())})},
+        frequency([{1, ?LAZY({invalid, binary(enacl:onetime_auth_BYTES())})},
                    {3, return({valid, enacl:onetime_auth(Msg, Key)})}]);
       false ->
-        binary(enacl:onetime_auth_size())
+        binary(enacl:onetime_auth_BYTES())
     end;
 ot_authenticator_good(_Msg, _Key) ->
-    binary(enacl:auth_size()).
+    binary(enacl:auth_BYTES()).
 
 ot_authenticator(Msg, Key) ->
   ?FAULT(ot_authenticator_bad(), ot_authenticator_good(Msg, Key)).
@@ -704,6 +799,13 @@ pwhash(Passwd, Salt) ->
     error:badarg -> badarg
   end.
 
+pwhash(Password, Salt, Ops, Mem, Alg) ->
+  try
+    enacl:pwhsah(Password, Salt, Ops, Mem, Alg)
+  catch
+    error:badarg -> badarg
+  end.
+
 pwhash_str(Passwd) ->
   try
     enacl:pwhash_str(Passwd)
@@ -718,13 +820,29 @@ pwhash_str_verify(PasswdHash, Passwd) ->
     error:badarg -> badarg
   end.
 
+prop_pwhash() ->
+  ?FORALL({Password, Salt, OLimit, MLimit, Alg},
+          {binary(16),
+           binary(16),
+           elements([interactive, moderate]), %% These could add senstitive, but are too runtime-expensive
+           elements([interactive, moderate]), %% And that is for a reason.
+           elements([default, 'argon2id13'])}, %% Argon2I13 uses different limits, so it is kept out as
+                                               %% this would otherwise fail
+    begin
+       Bin1 = enacl:pwhash(Password, Salt, OLimit, MLimit, Alg),
+       Bin2 = enacl:pwhash(Password, Salt, OLimit, MLimit, Alg),
+       equals(Bin1, Bin2)
+    end).
+
 prop_pwhash_str_verify() ->
-    ?FORALL({Passwd},
-            {?FAULT_RATE(1, 40, g_iodata())},
+    ?FORALL({Passwd, OLimit, MLimit},
+            {?FAULT_RATE(1, 40, g_iodata()),
+             elements([interactive, moderate]),
+             elements([interactive, moderate])},
             begin
                 case v_iodata(Passwd) of
                     true ->
-                        {ok, Ascii} = enacl:pwhash_str(Passwd),
+                        Ascii = enacl:pwhash_str(Passwd, OLimit, MLimit),
                         S = enacl:pwhash_str_verify(Ascii, Passwd),
                         equals(S, true);
                     false ->
@@ -758,6 +876,41 @@ prop_crypto_hash_neq() ->
         enacl:hash(X) /= enacl:hash(Y)
     ).
 
+prop_crypto_shorthash_eq() ->
+  ?FORALL(X, g_iodata(),
+    case v_iodata(X) of
+      true -> equals(enacl:hash(X), enacl:hash(X));
+      false ->
+        try
+          enacl:hash(X),
+          false
+        catch
+          error:badarg -> true
+        end
+      end
+    ).
+prop_crypto_generichash_eq() ->
+  ?FORALL({Sz, X, Key}, {g_generichash_size(), g_generichash_data(), g_generichash_key()},
+      equals(enacl:generichash(Sz, X, Key), enacl:generichash(Sz, X, Key))).
+
+generichash_loop(S, []) -> S;
+generichash_loop(S, [M|Ms]) ->
+  S2 = enacl:generichash_update(S, M),
+  generichash_loop(S2, Ms).
+
+prop_crypto_generichash_multi_part_eq() ->
+  ?FORALL({Sz, Xs, Key}, {g_generichash_size(), list(g_generichash_data()), g_generichash_key()},
+  begin
+    S1 = generichash_loop(enacl:generichash_init(Sz, Key), Xs),
+    S2 = generichash_loop(enacl:generichash_init(Sz, Key), Xs),
+    equals(enacl:generichash_final(S1), enacl:generichash_final(S2))
+  end).
+
+prop_crypto_shorthash_neq() ->
+  ?FORALL({X, Y}, diff_pair(),
+    enacl:hash(X) /= enacl:hash(Y)
+  ).
+
 %% STRING COMPARISON
 %% -------------------------
 %% * verify_16/2,
@@ -817,7 +970,8 @@ prop_randombytes() ->
     ?FORALL(X, g_nat(),
         case is_nat(X) of
             true ->
-                is_binary(enacl:randombytes(X));
+              R = enacl:randombytes(X),
+              is_binary(R) andalso (byte_size(R) == X);
             false ->
                 try
                     enacl:randombytes(X),
@@ -828,8 +982,84 @@ prop_randombytes() ->
                 end
        end).
 
+prop_randombytes_uint32() ->
+  ?FORALL(_, return(x),
+    begin
+      V = enacl:randombytes_uint32(),
+      is_integer(V)
+    end).
+
+%% KX
+%% ---------------------------
+prop_kx() ->
+  ?FORALL({{CPK, CSK}, {SPK, SSK}}, {kx_keypair_good(), kx_keypair_good()},
+  begin
+    #{ client_tx := CTX, client_rx := CRX} = enacl:kx_client_session_keys(CPK, CSK, SPK),
+    #{ server_tx := STX, server_rx := SRX} = enacl:kx_server_session_keys(SPK, SSK, CPK),
+    %% This keypair must be shared in both directions
+    conjunction([{ctx_srx, equals(CTX, SRX)}, {stx_crx, equals(STX, CRX)}])
+  end).
+
+%% SCRAMBLING
+prop_scramble_block() ->
+    ?FORALL({Block, Key}, {binary(16), eqc_gen:largebinary(32)},
+        is_binary(enacl_ext:scramble_block_16(Block, Key))).
+
+%% Scala multiplication
+prop_scalarmult() ->
+  Bytes = 32,
+  ?FORALL({S1, S2, Basepoint}, {binary(Bytes), binary(Bytes), binary(Bytes)},
+          equals(enacl:curve25519_scalarmult(S1,
+                       enacl:curve25519_scalarmult(S2, Basepoint)),
+                 enacl:curve25519_scalarmult(S2,
+                       enacl:curve25519_scalarmult(S1, Basepoint)))
+         ).
+
+%% Secretstream
+secretstream_key() ->
+  ?LET(K, enacl:secretstream_xchacha20poly1305_keygen(), K).
+
+secretstream_msg() ->
+  ?LET({Tag, AD, Msg}, {oneof([message,rekey,push]), binary(), binary()},
+    {Tag, AD, Msg}).
+
+secretstream_msgs() ->
+  ?LET({Ms, {_, AD, Msg}}, {list(secretstream_msg()), secretstream_msg()},
+   Ms ++ [{final, AD, Msg}]).
+
+push_messages(_State, []) ->
+  [];
+push_messages(State, [{Tag, AD, Msg}|Next]) ->
+  Block = enacl:secretstream_xchacha20poly1305_push(State, Msg, AD, Tag),
+  [Block|push_messages(State, Next)].
+
+pull_messages(_State, [], []) ->
+  true;
+pull_messages(State, [B|Bs], [{_Tag, AD, _Msg}=Expect|Next]) ->
+  {Msgx, Tagx} = enacl:secretstream_xchacha20poly1305_pull(State, B, AD),
+  case equals(Expect, {Tagx, AD, Msgx}) of
+    true ->
+      pull_messages(State, Bs, Next);
+    R ->
+      R
+  end.
+
+prop_secretstream() ->
+  ?FORALL({Key, Msgs}, {secretstream_key(), secretstream_msgs()},
+    begin
+      %% Encrypt
+      {Header, State} = enacl:secretstream_xchacha20poly1305_init_push(Key),
+      Blocks = push_messages(State, Msgs),
+      %% Decrypt & Verify
+      DState = enacl:secretstream_xchacha20poly1305_init_pull(Header, Key),
+      pull_messages(DState, Blocks, Msgs)
+    end).
+
+%% HELPERS
+
 %% INTERNAL FUNCTIONS
 %% ------------------------------------------------------------
+
 badargs(Thunk) ->
   try
     Thunk(),

eqc_test/enacl_ext_eqc.erl

@@ -1,7 +1,8 @@
 -module(enacl_ext_eqc).
 
 -include_lib("eqc/include/eqc.hrl").
--compile(export_all).
+-compile({parse_transform, eqc_parallelize}).
+-compile([export_all, nowarn_export_all]).
 
 public_keypair() ->
     ?LET(#{ public := PK, secret := SK}, enacl_ext:curve25519_keypair(),

rebar.config

@@ -1,9 +1,39 @@
 {erl_opts, [debug_info]}.
 
-{pre_hooks, [{"freebsd", compile, "gmake -C c_src"},
-             {"freebsd", clean, "gmake -C c_src clean"},
-             {"netbsd", compile, "gmake -C c_src"},
-             {"netbsd", clean, "gmake -C c_src clean"},
-             {"(linux|darwin|solaris)", compile, "make -C c_src"},
-             {"(linux|darwin|solaris)", clean, "make -C c_src clean"}
+{plugins, [pc]}.
+
+{project_plugins, [rebar3_hex]}.
+
+{provider_hooks, [
+    {pre, [
+        {compile, {pc, compile}},
+        {clean,   {pc, clean}}
+    ]}
+]}.
+
+{port_specs, [
+    {"priv/enacl_nif.so", [
+        "c_src/*.c"
+    ]}
+]}.
+
+{port_env, [
+    {"darwin", "CFLAGS", "$CFLAGS -fPIC -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes"},
+    {"darwin", "CXXFLAGS", "$CXXFLAGS -fPIC -O3 -finline-functions -Wall"},
+    {"darwin", "LDFLAGS", "$LDFLAGS -flat_namespace -undefined suppress -lsodium"},
+
+    {"linux", "CFLAGS", "$CFLAGS -fPIC -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes"},
+    {"linux", "CXXFLAGS", "$CXXFLAGS -fPIC -O3 -finline-functions -Wall"},
+    {"linux", "LDFLAGS", "$LDFLAGS -lsodium"},
+
+    {"freebsd", "CFLAGS", "$CFLAGS -fPIC -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes -I /usr/local/include"},
+    {"freebsd", "CXXFLAGS", "$CXXFLAGS -fPIC -O3 -finline-functions -Wall"},
+    {"freebsd", "LDFLAGS", "$LDFLAGS -fPIC -L /usr/local/lib -lsodium"},
+
+    {"solaris", "CFLAGS", "$CFLAGS -fPIC -m64 -I/opt/local/include -O2 -std=c99 -finline-functions -Wall -Wmissing-prototypes"},
+    {"solaris", "CXXFLAGS", "$CXXFLAGS -fPIC -O2 -finline-function -Wall"},
+    {"solaris", "LDFLAGS", "$LDFLAGS -m64 -fPIC -L /opt/local/lib -lsodium"},
+
+    {"win32", "CFLAGS", "$CFLAGS /LD /O2 /DNDEBUG"},
+    {"win32", "LDFLAGS", "$LDFLAGS libsodium.dll.a"}
 ]}.

shell.nix

@@ -0,0 +1,12 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+pkgs.mkShell {
+  buildInputs = [
+    pkgs.hello
+
+    # keep this line if you use bash
+    pkgs.bashInteractive
+    pkgs.erlang
+    pkgs.libsodium
+  ];
+}

src/enacl.app.src

@@ -1,6 +1,6 @@
 {application,enacl,
              [{description,"Erlang libsodium (NaCl) bindings"},
-              {vsn,"0.17.1"},
+              {vsn,"1.2.1"},
               {registered,[]},
               {applications,[kernel,stdlib]},
               {env,[]},

src/enacl_nif.erl

@@ -25,8 +25,10 @@
 
          crypto_sign_PUBLICKEYBYTES/0,
          crypto_sign_SECRETKEYBYTES/0,
+         crypto_sign_SEEDBYTES/0,
 
          crypto_sign_keypair/0,
+         crypto_sign_seed_keypair/1,
 
          crypto_sign/2,
          crypto_sign_open/2,
@@ -34,6 +36,11 @@
          crypto_sign_detached/2,
          crypto_sign_verify_detached/3,
 
+         crypto_sign_init/0,
+         crypto_sign_update/2,
+         crypto_sign_final_create/2,
+         crypto_sign_final_verify/3,
+
          crypto_box_seal/2,
          crypto_box_seal_open/3,
          crypto_box_SEALBYTES/0
@@ -50,6 +57,10 @@
          crypto_secretbox_b/3,
          crypto_secretbox_open/3,
          crypto_secretbox_open_b/3,
+         crypto_secretbox_easy/3,
+         crypto_secretbox_easy_b/3,
+         crypto_secretbox_open_easy/3,
+         crypto_secretbox_open_easy_b/3,
 
          crypto_stream_chacha20_KEYBYTES/0,
          crypto_stream_chacha20_NONCEBYTES/0,
@@ -67,12 +78,19 @@
          crypto_stream_xor/3,
          crypto_stream_xor_b/3,
 
-         crypto_aead_chacha20poly1305_encrypt/4,
-         crypto_aead_chacha20poly1305_decrypt/4,
-         crypto_aead_chacha20poly1305_KEYBYTES/0,
-         crypto_aead_chacha20poly1305_NPUBBYTES/0,
-         crypto_aead_chacha20poly1305_ABYTES/0,
-         crypto_aead_chacha20poly1305_MESSAGEBYTES_MAX/0,
+         crypto_aead_chacha20poly1305_ietf_encrypt/4,
+         crypto_aead_chacha20poly1305_ietf_decrypt/4,
+         crypto_aead_chacha20poly1305_ietf_KEYBYTES/0,
+         crypto_aead_chacha20poly1305_ietf_NPUBBYTES/0,
+         crypto_aead_chacha20poly1305_ietf_ABYTES/0,
+         crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX/0,
+
+         crypto_aead_xchacha20poly1305_ietf_encrypt/4,
+         crypto_aead_xchacha20poly1305_ietf_decrypt/4,
+         crypto_aead_xchacha20poly1305_ietf_KEYBYTES/0,
+         crypto_aead_xchacha20poly1305_ietf_NPUBBYTES/0,
+         crypto_aead_xchacha20poly1305_ietf_ABYTES/0,
+         crypto_aead_xchacha20poly1305_ietf_MESSAGEBYTES_MAX/0,
 
          crypto_auth_BYTES/0,
          crypto_auth_KEYBYTES/0,
@@ -105,6 +123,7 @@
 %% Ed 25519
 -export([
          crypto_sign_ed25519_keypair/0,
+         crypto_sign_ed25519_sk_to_pk/1,
          crypto_sign_ed25519_public_to_curve25519/1,
          crypto_sign_ed25519_secret_to_curve25519/1,
          crypto_sign_ed25519_PUBLICKEYBYTES/0,
@@ -132,11 +151,19 @@
 
 %% Password Hashing - Argon2 Algorithm
 -export([
-         crypto_pwhash/2,
-         crypto_pwhash_str/1,
+         crypto_pwhash_SALTBYTES/0,
+         crypto_pwhash/5,
+         crypto_pwhash_str/3,
          crypto_pwhash_str_verify/2
         ]).
 
+%% Key Derivation
+-export([
+         crypto_kdf_KEYBYTES/0,
+         crypto_kdf_CONTEXTBYTES/0,
+         crypto_kdf_derive_from_key/3
+        ]).
+
 %% Generic hash
 -export([
          crypto_generichash_BYTES/0,
@@ -147,13 +174,33 @@
          crypto_generichash_KEYBYTES_MAX/0,
          crypto_generichash/3,
          crypto_generichash_init/2,
-         crypto_generichash_update/3,
-         crypto_generichash_final/2
+         crypto_generichash_update/2,
+         crypto_generichash_final/1
+        ]).
+
+%% Secretstream
+-export([
+         crypto_secretstream_xchacha20poly1305_ABYTES/0,
+         crypto_secretstream_xchacha20poly1305_HEADERBYTES/0,
+         crypto_secretstream_xchacha20poly1305_KEYBYTES/0,
+         crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX/0,
+         crypto_secretstream_xchacha20poly1305_TAG_MESSAGE/0,
+         crypto_secretstream_xchacha20poly1305_TAG_PUSH/0,
+         crypto_secretstream_xchacha20poly1305_TAG_REKEY/0,
+         crypto_secretstream_xchacha20poly1305_TAG_FINAL/0,
+         crypto_secretstream_xchacha20poly1305_keygen/0,
+         crypto_secretstream_xchacha20poly1305_init_push/1,
+         crypto_secretstream_xchacha20poly1305_push/4,
+         crypto_secretstream_xchacha20poly1305_init_pull/2,
+         crypto_secretstream_xchacha20poly1305_pull/3,
+         crypto_secretstream_xchacha20poly1305_rekey/1
         ]).
 
 %% Access to the RNG
 -export([
-         randombytes/1
+         randombytes/1,
+         randombytes_uint32/0,
+         randombytes_uniform/1
         ]).
 
 %% Undocumented features :>
@@ -185,13 +232,33 @@ crypto_generichash_KEYBYTES_MAX() -> erlang:nif_error(nif_not_loaded).
 crypto_generichash(_HashSize, _Message, _Key) -> erlang:nif_error(nif_not_loaded).
 
 crypto_generichash_init(_HashSize, _Key) ->  erlang:nif_error(nif_not_loaded).
-crypto_generichash_update(_HashSize, _HashState, _Message) ->  erlang:nif_error(nif_not_loaded).
-crypto_generichash_final(_HashSize, _HashState) ->  erlang:nif_error(nif_not_loaded).
+crypto_generichash_update(_HashState, _Message) ->  erlang:nif_error(nif_not_loaded).
+crypto_generichash_final(_HashState) ->  erlang:nif_error(nif_not_loaded).
 
-crypto_pwhash(_Password, _Salt) -> erlang:nif_error(nif_not_loaded).
-crypto_pwhash_str(_Password) -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_ABYTES() -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_HEADERBYTES() -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_KEYBYTES() -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX() -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_TAG_MESSAGE() -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_TAG_PUSH() -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_TAG_REKEY() -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_TAG_FINAL() -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_keygen() -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_init_push(_Key) -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_push(_Ref, _Message, _AD, _Tag) -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_init_pull(_Header, _Key) -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_pull(_Ref, _CipherText, _AD) -> erlang:nif_error(nif_not_loaded).
+crypto_secretstream_xchacha20poly1305_rekey(_Ref) -> erlang:nif_error(nif_not_loaded).
+
+crypto_pwhash_SALTBYTES() -> erlang:nif_error(nif_not_loaded).
+crypto_pwhash(_Password, _Salt, _Ops, _Mem, _Alg) -> erlang:nif_error(nif_not_loaded).
+crypto_pwhash_str(_Password, _Ops, _Mem) -> erlang:nif_error(nif_not_loaded).
 crypto_pwhash_str_verify(_HashedPassword, _Password) -> erlang:nif_error(nif_not_loaded).
 
+crypto_kdf_KEYBYTES() -> erlang:nif_error(nif_not_loaded).
+crypto_kdf_CONTEXTBYTES() -> erlang:nif_error(nif_not_loaded).
+crypto_kdf_derive_from_key(_MasterKey, _Context, _Id) -> erlang:nif_error(nif_not_loaded).
+
 crypto_box_NONCEBYTES() -> erlang:nif_error(nif_not_loaded).
 crypto_box_ZEROBYTES() -> erlang:nif_error(nif_not_loaded).
 crypto_box_BOXZEROBYTES() -> erlang:nif_error(nif_not_loaded).
@@ -211,8 +278,10 @@ crypto_box_open_afternm_b(_CipherText, _Nonce, _K) -> erlang:nif_error(nif_not_l
 
 crypto_sign_PUBLICKEYBYTES() -> erlang:nif_error(nif_not_loaded).
 crypto_sign_SECRETKEYBYTES() -> erlang:nif_error(nif_not_loaded).
+crypto_sign_SEEDBYTES() -> erlang:nif_error(nif_not_loaded).
 
 crypto_sign_keypair() -> erlang:nif_error(nif_not_loaded).
+crypto_sign_seed_keypair(_S) -> erlang:nif_error(nif_not_loaded).
 crypto_sign(_M, _SK) -> erlang:nif_error(nif_not_loaded).
 crypto_sign_open(_SignedMessage, _PK) -> erlang:nif_error(nif_not_loaded).
 
@@ -220,6 +289,11 @@ crypto_sign_detached(_M, _SK) -> erlang:nif_error(nif_not_loaded).
 
 crypto_sign_verify_detached(_Sig, _M, _PK) -> erlang:nif_error(nif_not_loaded).
 
+crypto_sign_init() -> erlang:nif_error(nif_not_loaded).
+crypto_sign_update(_S, _M) -> erlang:nif_error(nif_not_loaded).
+crypto_sign_final_create(_S, _SK) -> erlang:nif_error(nif_not_loaded).
+crypto_sign_final_verify(_State, _Sig, _PK) -> erlang:nif_error(nif_not_loaded).
+
 crypto_box_seal(_Msg, _PK) -> erlang:nif_error(nif_not_loaded).
 crypto_box_seal_open(_CipherText, _PK, _SK) -> erlang:nif_error(nif_not_loaded).
 crypto_box_SEALBYTES() -> erlang:nif_error(nif_not_loaded).
@@ -233,6 +307,10 @@ crypto_secretbox(_Msg, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
 crypto_secretbox_b(_Msg, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
 crypto_secretbox_open(_Msg, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
 crypto_secretbox_open_b(_Msg, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
+crypto_secretbox_easy(_Msg, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
+crypto_secretbox_easy_b(_Msg, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
+crypto_secretbox_open_easy(_Msg, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
+crypto_secretbox_open_easy_b(_Msg, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
 
 crypto_stream_chacha20_KEYBYTES() -> erlang:nif_error(nif_not_loaded).
 crypto_stream_chacha20_NONCEBYTES() -> erlang:nif_error(nif_not_loaded).
@@ -248,12 +326,19 @@ crypto_stream_b(_Bytes, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
 crypto_stream_xor(_M, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
 crypto_stream_xor_b(_M, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
 
-crypto_aead_chacha20poly1305_encrypt(_Key, _Nonce, _AD, _Message) -> erlang:nif_error(nif_not_loaded).
-crypto_aead_chacha20poly1305_decrypt(_Key, _Nonce, _AD, _Message) -> erlang:nif_error(nif_not_loaded).
-crypto_aead_chacha20poly1305_KEYBYTES()                           -> erlang:nif_error(nif_not_loaded).
-crypto_aead_chacha20poly1305_NPUBBYTES()                          -> erlang:nif_error(nif_not_loaded).
-crypto_aead_chacha20poly1305_ABYTES()                             -> erlang:nif_error(nif_not_loaded).
-crypto_aead_chacha20poly1305_MESSAGEBYTES_MAX()                   -> erlang:nif_error(nif_not_loaded).
+crypto_aead_chacha20poly1305_ietf_encrypt(_Message, _AD, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
+crypto_aead_chacha20poly1305_ietf_decrypt(_CipherText, _AD, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
+crypto_aead_chacha20poly1305_ietf_KEYBYTES()                           -> erlang:nif_error(nif_not_loaded).
+crypto_aead_chacha20poly1305_ietf_NPUBBYTES()                          -> erlang:nif_error(nif_not_loaded).
+crypto_aead_chacha20poly1305_ietf_ABYTES()                             -> erlang:nif_error(nif_not_loaded).
+crypto_aead_chacha20poly1305_ietf_MESSAGEBYTES_MAX()                   -> erlang:nif_error(nif_not_loaded).
+
+crypto_aead_xchacha20poly1305_ietf_encrypt(_Message, _AD, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
+crypto_aead_xchacha20poly1305_ietf_decrypt(_CipherText, _AD, _Nonce, _Key) -> erlang:nif_error(nif_not_loaded).
+crypto_aead_xchacha20poly1305_ietf_KEYBYTES()                           -> erlang:nif_error(nif_not_loaded).
+crypto_aead_xchacha20poly1305_ietf_NPUBBYTES()                          -> erlang:nif_error(nif_not_loaded).
+crypto_aead_xchacha20poly1305_ietf_ABYTES()                             -> erlang:nif_error(nif_not_loaded).
+crypto_aead_xchacha20poly1305_ietf_MESSAGEBYTES_MAX()                   -> erlang:nif_error(nif_not_loaded).
 
 crypto_auth_BYTES() -> erlang:nif_error(nif_not_loaded).
 crypto_auth_KEYBYTES() -> erlang:nif_error(nif_not_loaded).
@@ -277,6 +362,7 @@ crypto_curve25519_scalarmult(_Secret, _BasePoint) -> erlang:nif_error(nif_not_lo
 crypto_curve25519_scalarmult_base(_Secret) -> erlang:nif_error(nif_not_loaded).
 
 crypto_sign_ed25519_keypair() -> erlang:nif_error(nif_not_loaded).
+crypto_sign_ed25519_sk_to_pk(_SecretKey) -> erlang:nif_error(nif_not_loaded).
 crypto_sign_ed25519_public_to_curve25519(_PublicKey) -> erlang:nif_error(nif_not_loaded).
 crypto_sign_ed25519_secret_to_curve25519(_SecretKey) -> erlang:nif_error(nif_not_loaded).
 crypto_sign_ed25519_PUBLICKEYBYTES() -> erlang:nif_error(nif_not_loaded).
@@ -296,5 +382,7 @@ crypto_kx_PUBLICKEYBYTES() -> erlang:nif_error(nif_not_loaded).
 crypto_kx_SECRETKEYBYTES() -> erlang:nif_error(nif_not_loaded).
 
 randombytes(_RequestedSize) -> erlang:nif_error(nif_not_loaded).
+randombytes_uint32() -> erlang:nif_error(nif_not_loaded).
+randombytes_uniform(_UpperBound) -> erlang:nif_error(nif_not_loaded).
 
 scramble_block_16(_Block, _Key) -> erlang:nif_error(nif_not_loaded).

test/enacl_SUITE.erl

@@ -0,0 +1,196 @@
+-module(enacl_SUITE).
+-include_lib("common_test/include/ct.hrl").
+
+-compile([export_all, nowarn_export_all]).
+
+suite() ->
+    [{timetrap, {seconds, 30}}].
+
+init_per_group(_Group, Config) ->
+    Config.
+
+end_per_group(_Group, _Config) ->
+    ok.
+
+init_per_suite(Config) ->
+    application:ensure_all_started(enacl),
+    Config.
+
+end_per_suite(_Config) ->
+    application:stop(enacl),
+    ok.
+
+init_per_testcase(x, Config) ->
+    {ok, _} = dbg:tracer(),
+    dbg:p(all, c),
+    dbg:tpl(graphql_execute, lookup_field, '_', cx),
+    Config;
+init_per_testcase(_Case, Config) ->
+    Config.
+
+end_per_testcase(x, _Config) ->
+    dbg:stop_clear(),
+    ok;
+end_per_testcase(_Case, _Config) ->
+    ok.
+
+groups() ->
+    Neg = {negative, [shuffle, parallel],
+      [generichash_basic_neg]},
+    Pos = {positive, [shuffle, parallel],
+                    [
+                     aead_chacha20poly1305_ietf,
+                     aead_xchacha20poly1305,
+                     generichash_basic_pos,
+                     generichash_chunked,
+                     kx,
+                     pwhash,
+                     secretstream,
+                     sign,
+                     verify_detached
+                    ]},
+
+    [Neg, Pos].
+
+all() ->
+    [{group, negative},
+     {group, positive}].
+
+%% -- BASIC --------------------------------------
+generichash_basic_neg(_Config) ->
+    %% Negative generichash invocations
+    Msg = <<"I've seen things you people wouldn't believe: attack ships on fire off the shoulder of Orion. "
+            "I've watched C-beams glitter in the dark near the Tannhäuser Gate. "
+            "All those... moments... will be lost... in time, like... tears... in rain">>,
+    Key = <<"Hash Key 123456789">>,
+    {'EXIT', {badarg, _}} = (catch enacl:generichash(9, Msg, Key)),
+    {'EXIT', {badarg, _}} = (catch enacl:generichash(65, Msg, Key)),
+    {'EXIT', {badarg, _}} = (catch enacl:generichash(32, Msg, <<"Small">>)),
+    ok.
+
+generichash_basic_pos(_Config) ->
+    Msg = <<"I've seen things you people wouldn't believe: attack ships on fire off the shoulder of Orion. "
+            "I've watched C-beams glitter in the dark near the Tannhäuser Gate. "
+            "All those... moments... will be lost... in time, like... tears... in rain">>,
+    Key = <<"Hash Key 123456789">>,
+    <<189,104,45,187,170,229,212,4,121,43,137,74,241,173,181,77,
+          67,211,133,70,196,6,128,97>> = enacl:generichash(24, Msg, Key),
+    ok.
+
+generichash_chunked(_Config) ->
+    Msg = <<"I've seen things you people wouldn't believe: attack ships on fire off the shoulder of Orion. "
+            "I've watched C-beams glitter in the dark near the Tannhäuser Gate. "
+            "All those... moments... will be lost... in time, like... tears... in rain">>,
+    Key = <<"Hash Key 123456789">>,
+    State = enacl:generichash_init(24, Key),
+    State = generichash_chunked(State, Msg, 10000),
+    Expected = <<46,49,32,18,13,186,182,105,106,122,253,139,89,176,169,141,
+                 73,93,99,6,41,216,110,41>>,
+    Expected = enacl:generichash_final(State),
+    try enacl:generichash_final(State) of
+        _ -> ct:fail(must_finalize)
+    catch
+        error:enacl_finalized ->
+            ok
+    end,
+    try enacl:generichash_update(State, <<"x">>) of
+        _ -> ct:fail(must_finalize)
+    catch
+        error:enacl_finalized ->
+            ok
+    end,
+    ok.
+
+generichash_chunked(State, _Msg, 0) -> State;
+generichash_chunked(State, Msg, N) ->
+    State2 = enacl:generichash_update(State, Msg),
+    generichash_chunked(State2, Msg, N-1).
+
+aead_xchacha20poly1305(_Config) ->
+    NonceLen = enacl:aead_xchacha20poly1305_ietf_NPUBBYTES(),
+    KLen = enacl:aead_xchacha20poly1305_ietf_KEYBYTES(),
+    Key = binary:copy(<<"K">>, KLen),
+    Msg = <<"test">>,
+    AD = <<1,2,3,4,5,6>>,
+    Nonce = binary:copy(<<"N">>, NonceLen),
+
+    CipherText = enacl:aead_xchacha20poly1305_ietf_encrypt(Msg, AD, Nonce, Key),
+    Msg = enacl:aead_xchacha20poly1305_ietf_decrypt(CipherText, AD, Nonce, Key),
+    ok.
+
+aead_chacha20poly1305_ietf(_Config) ->
+    NonceLen = enacl:aead_chacha20poly1305_ietf_NPUBBYTES(),
+    KLen = enacl:aead_chacha20poly1305_ietf_KEYBYTES(),
+    Key = binary:copy(<<"K">>, KLen),
+    Msg = <<"test">>,
+    AD = <<1,2,3,4,5,6>>,
+    Nonce = binary:copy(<<"N">>, NonceLen),
+
+    CipherText = enacl:aead_chacha20poly1305_ietf_encrypt(Msg, AD, Nonce, Key),
+    Msg = enacl:aead_chacha20poly1305_ietf_decrypt(CipherText, AD, Nonce, Key),
+    ok.
+
+pwhash(_Config) ->
+    PW = <<"XYZZY">>,
+    Salt = <<"1234567890abcdef">>,
+    Hash1 = <<164,75,127,151,168,101,55,77,48,77,240,204,64,20,43,23,88,
+                 18,133,11,53,151,2,113,232,95,84,165,50,7,60,20>>,
+    Hash1 = enacl:pwhash(PW, Salt),
+    Str1 = enacl:pwhash_str(PW),
+    true = enacl:pwhash_str_verify(Str1, PW),
+    false = enacl:pwhash_str_verify(Str1, <<PW/binary, 1>>),
+    16 = enacl:pwhash_SALTBYTES(),
+    ok.
+
+sign(_Config) ->
+    #{public := PK, secret := SK} = enacl:sign_keypair(),
+    Msg = <<"Test">>,
+    State = enacl:sign_init(),
+    Create = sign_chunked(State, Msg, 10000),
+    {ok, Signature} = enacl:sign_final_create(Create, SK),
+    StateVerify = enacl:sign_init(),
+    Verify = sign_chunked(StateVerify, Msg, 10000),
+    true = enacl:sign_final_verify(Verify, Signature, PK),
+    ok.
+
+sign_chunked(S, _M, 0) -> S;
+sign_chunked(S, M, N) ->
+    S2 = enacl:sign_update(S, M),
+    sign_chunked(S2, M, N-1).
+
+kx(_Config) ->
+    #{ public := CPK, secret := CSK} = enacl:kx_keypair(),
+    #{ public := SPK, secret := SSK} = enacl:kx_keypair(),
+    #{ client_tx := CTX, client_rx := CRX} = enacl:kx_client_session_keys(CPK, CSK, SPK),
+    #{ server_tx := STX, server_rx := SRX} = enacl:kx_server_session_keys(SPK, SSK, CPK),
+    %% Verify we got a shared keypair
+    CTX = SRX,
+    STX = CRX,
+    ok.
+
+secretstream(_Config) ->
+    Part1 = <<"Arbitrary data to encrypt">>,
+    Part2 = <<"split into">>,
+    Part3 = <<"three messages">>,
+
+    Key = enacl:secretstream_xchacha20poly1305_keygen(),
+
+    %% Encrypt
+    {Header, State} = enacl:secretstream_xchacha20poly1305_init_push(Key),
+    Block1 = enacl:secretstream_xchacha20poly1305_push(State, Part1, <<"AD1">>, message),
+    Block2 = enacl:secretstream_xchacha20poly1305_push(State, Part2, <<>>, message),
+    Block3 = enacl:secretstream_xchacha20poly1305_push(State, Part3, <<"AD3">>, final),
+
+    %% Decrypt
+    DState = enacl:secretstream_xchacha20poly1305_init_pull(Header, Key),
+    {Part1, message} = enacl:secretstream_xchacha20poly1305_pull(DState, Block1, <<"AD1">>),
+    {Part2, message} = enacl:secretstream_xchacha20poly1305_pull(DState, Block2, <<>>),
+    {Part3, final} = enacl:secretstream_xchacha20poly1305_pull(DState, Block3, <<"AD3">>),
+    ok.
+
+verify_detached(_Config) ->
+    #{ public := PK, secret := SK} = enacl:sign_keypair(),
+    M = <<"Arbitrary data to encrypt">>,
+    Sig = enacl:sign_detached(M, SK),
+    true = enacl:sign_verify_detached(Sig, M, PK),
+    ok.