Add support for deprecated signatures (#15)

Cargo.toml

@@ -11,7 +11,7 @@ name = "schnorrkel_crust"
 crate-type = ["cdylib", "staticlib"]
 
 [dependencies]
-schnorrkel = { version="0.9.1" }
+schnorrkel = { version="0.9.1", features = ["preaudit_deprecated"] }
 ed25519-dalek = { version="1.0.0" }
 rand_chacha = "0.2.2"
 merlin = { version = "2.0", default-features = false }

src/sr25519.rs

@@ -86,7 +86,7 @@ fn create_from_seed(seed: &[u8]) -> Keypair {
 fn create_from_pair(pair: &[u8]) -> Keypair {
     match Keypair::from_bytes(pair) {
         Ok(pair) => return pair,
-        Err(_) => panic!(format!("Provided pair is invalid: {:?}", pair)),
+        Err(_) => panic!("Provided pair is invalid: {:?}", pair),
     }
 }
 
@@ -249,6 +249,29 @@ pub unsafe extern "C" fn sr25519_sign(
     );
 }
 
+/// Verify a message and its corresponding against a public key;
+///
+/// * signature_ptr: verify this signature
+/// * message_ptr: Arbitrary message; input buffer of message_length bytes
+/// * message_length: Message size
+/// * public_ptr: verify with this public key; input buffer of SR25519_PUBLIC_SIZE bytes
+///
+/// * returned true if signature is valid, false otherwise
+#[allow(unused_attributes)]
+#[no_mangle]
+pub unsafe extern "C" fn sr25519_verify_deprecated(
+    signature_ptr: *const u8,
+    message_ptr: *const u8,
+    message_length: c_ulong,
+    public_ptr: *const u8,
+) -> bool {
+    let public = slice::from_raw_parts(public_ptr, SR25519_PUBLIC_SIZE as usize);
+    let signature = slice::from_raw_parts(signature_ptr, SR25519_SIGNATURE_SIZE as usize);
+    let message = slice::from_raw_parts(message_ptr, message_length as usize);
+
+    create_public(public).verify_simple_preaudit_deprecated(SIGNING_CTX, message, &signature).is_ok()
+}
+
 /// Verify a message and its corresponding against a public key;
 ///
 /// * signature_ptr: verify this signature
@@ -272,7 +295,6 @@ pub unsafe extern "C" fn sr25519_verify(
         Ok(signature) => signature,
         Err(_) => return false,
     };
-
     create_public(public).verify_simple(SIGNING_CTX, message, &signature).is_ok()
 }
 

test/ed25519/test.cpp

@@ -3,6 +3,8 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <array>
+
 #include <gtest/gtest.h>
 #include <gmock/gmock.h>