signMessage method

List<int> signMessage({ required List<int> message, bool hashMessage = true, String messagePrefix = BitcoinSignerUtils.signMessagePrefix, List<int> extraEntropy = const [], })

Signs a message using Bitcoin's message signing format.

This method produces a compact ECDSA signature for a given message, following the Bitcoin Signed Message standard.

• message: The raw message to be signed.
• messagePrefix: The prefix used for Bitcoin's message signing.
• extraEntropy: Optional extra entropy to modify the signature.

Implementation

List<int> signMessage(
    {required List<int> message,
    bool hashMessage = true,
    String messagePrefix = BitcoinSignerUtils.signMessagePrefix,
    List<int> extraEntropy = const []}) {
  List<int> messgaeHash = message;
  if (hashMessage) {
    messgaeHash = QuickCrypto.sha256Hash(
        BitcoinSignerUtils.magicMessage(message, messagePrefix));
  }
  final signature =
      _signingKey.sign(digest: messgaeHash, extraEntropy: extraEntropy);
  return [
    signature.item2 + 27,
    ...signature.item1.toBytes(BitcoinSignerUtils.baselen)
  ];
}