From c6de481b2e4c31f14bcfa02b7f9ebc72172feaec Mon Sep 17 00:00:00 2001
From: Technion <technion@lolware.net>
Date: Sun, 31 Dec 2017 02:40:22 +0000
Subject: [PATCH] Changed -spec on generichash/2 and generichash/3. Fixes #17.

---
 src/enacl.erl | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/enacl.erl b/src/enacl.erl
index b19ae55..563d603 100644
--- a/src/enacl.erl
+++ b/src/enacl.erl
@@ -285,7 +285,8 @@ unsafe_memzero(_) ->
 %% This function generates a hash of the message using a key. The hash size is
 %% either 16, 32 or 64 bytes
 %% @end
--spec generichash(iodata(), binary()) -> {ok, binary()} | {error, term()}.
+-type generichash_bytes() :: ?CRYPTO_GENERICHASH_BYTES_MIN..?CRYPTO_GENERICHASH_BYTES_MAX.
+-spec generichash(generichash_bytes(), iodata(), binary()) -> {ok, binary()} | {error, term()}.
 generichash(HashSize, Message, Key) ->
     enacl_nif:crypto_generichash(HashSize, Message, Key).
 
@@ -294,6 +295,7 @@ generichash(HashSize, Message, Key) ->
 %% This function generates a hash of the message. The hash size is
 %% either 16, 32 or 64 bytes
 %% @end
+-spec generichash(generichash_bytes(), iodata()) -> {ok, binary()} | {error, term()}.
 generichash(HashSize, Message) ->
     enacl_nif:crypto_generichash(HashSize, Message, <<>>).