message: Add signature length check
diff: @@ -18,6 +18,12 @@ pub fn secp256k1_verify(
  message_hash.len()
  )));
  }
  + if signature.len() != 64 {
  + return Err(CryptoError::generic_err(format!(
  + "Wrong signature length: {}",
  + signature.len()
  + )));
  + }
  // Already hashed, just build Digest container
  let message_digest = Identity256::new().chain(message_hash);
  