verifySuiSignature function

VerifyResult verifySuiSignature(VerifySuiSignatureArgs args)

BLAKE2b-256 of the intent message (or the given hash) + Ed25519 verification.

Implementation

VerifyResult verifySuiSignature(VerifySuiSignatureArgs args) {
  Uint8List digest;
  final messageHash = args.messageHash;
  final intentMessage = args.intentMessage;
  if (messageHash != null) {
    if (messageHash.length != 32) return failed('messageHash must be 32 bytes');
    digest = messageHash;
  } else if (intentMessage != null) {
    digest = suiIntentDigest(intentMessage);
  } else {
    return failed('provide intentMessage or messageHash');
  }
  final expectedPublicKey = args.expectedPublicKey;
  if (expectedPublicKey != null &&
      !equalBytes(args.publicKey, expectedPublicKey)) {
    return failed('the reply public key is not the linked account key');
  }
  bool ok;
  try {
    ok = ed25519Verify(args.publicKey, digest, args.signature);
  } on Object catch (e) {
    return failed('Sui signature could not be checked: $e');
  }
  return ok
      ? verified
      : failed('the signature does not belong to this account');
}