getPublicKey static method

ECDSAPublicKey? getPublicKey(
  1. List<int> message,
  2. List<int> signature, {
  3. bool hashMessage = true,
  4. int? payloadLength,
})

Gets the recovered ECDSAPublicKey from a message and signature.

Parameters:

  • message: The message.
  • signature: The signature bytes.
  • hashMessage: Whether to hash the message before recovering the public key (default is true).
  • payloadLength: An optional payload length to include in the message prefix.

Returns:

  • The recovered ECDSAPublicKey.

Implementation

static ECDSAPublicKey? getPublicKey(List<int> message, List<int> signature,
    {bool hashMessage = true, int? payloadLength}) {
  final List<int> messagaeHash = _hashMessage(message,
      hashMessage: hashMessage, payloadLength: payloadLength);
  final ethSignature = ETHSignature.fromBytes(signature);
  final toBytes = ethSignature.toBytes(false);
  final recoverId = toBytes[CryptoSignerConst.ecdsaSignatureLength];
  final signatureBytes = ECDSASignature.fromBytes(
      toBytes.sublist(0, CryptoSignerConst.ecdsaSignatureLength),
      CryptoSignerConst.generatorSecp256k1);
  return signatureBytes.recoverPublicKey(
      messagaeHash, CryptoSignerConst.generatorSecp256k1, recoverId);
}