signDigest method
Signs a given digest using the private key and a specified value of 'k'.
Implementation
ECDSASignature signDigest({
required List<int> digest,
List<int>? entropy,
required BigInt k,
bool truncate = false,
}) {
final digestInt = _truncateAndConvertDigest(
digest,
generator,
truncate: truncate,
);
final sign = privateKey.sign(digestInt, k);
return sign;
}