From 1557a5a0df6c0c365167b816099c9c423aac2703 Mon Sep 17 00:00:00 2001
From: John Newby <john@newby.org>
Date: Thu, 1 Aug 2019 15:09:57 +0200
Subject: [PATCH] Initial commit

---
 Cargo.toml | 13 +++++++++++++
 src/lib.rs | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 Cargo.toml
 create mode 100644 src/lib.rs

diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a23edf5
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "ecrecover"
+version = "0.1.0"
+authors = ["John Newby <john@newby.org>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+c_vec = "1.3.3"
+libc = "0.2.60"
+parity-bytes = "0.1.0"
+ethcore-builtin = { path = "../parity-ethereum/ethcore/builtin" }
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..7dee6ee
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,36 @@
+extern crate c_vec;
+extern crate ethcore_builtin;
+extern crate libc;
+extern crate parity_bytes;
+
+use std::ffi::*;
+use ethcore_builtin::EcRecover;
+use crate::ethcore_builtin::Implementation;
+use c_vec::{CVec};
+use parity_bytes::BytesRef;
+use std::ptr::copy_nonoverlapping;
+
+const LENGTH: usize = 32;
+#[repr(C)]
+struct Buffer {
+    data: *mut [u8;LENGTH],
+}
+
+
+#[no_mangle]
+pub unsafe extern "C" fn ecrecover(input: *const libc::c_uchar, output: *mut libc::c_uchar) {
+    let ecrecover = EcRecover { };
+    let mut byte_ref = Vec::new();
+    ecrecover.execute(unsafe { std::slice::from_raw_parts(input as *const u8, LENGTH) },
+                      &mut BytesRef::Flexible(&mut byte_ref));
+    let mut ptr: &mut[u8] = unsafe { std::slice::from_raw_parts_mut(output as *mut u8, LENGTH) };
+    ptr.copy_from_slice(byte_ref.as_slice());
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}