ecdsaSign function
Implementation
List<int> ecdsaSign(List<int> privateKeyBytes, List<int> hash) {
final priv = PrivateKey.fromBytes(getP256(), privateKeyBytes);
final sig = signature(priv, hash);
// final encoded = ASN1Sequence(elements: [
// ASN1Integer(sig.R),
// ASN1Integer(sig.S),
// ]).encode();
final encoded = sig.toASN1();
return encoded;
}