signEd25519 function
Cryptographic signature methods.
Sign a message with a ed25519 private key and return signature
Implementation
///Sign a message with a ed25519 private key and return signature
Uint8List signEd25519(
{required Uint8List message, required Uint8List privateKey}) {
final signingKey = SigningKey(seed: privateKey);
final verifyKey = signingKey.verifyKey;
final signed = signingKey.sign(message);
if (signed.isEmpty) {
throw Exception('Signing the massage is failed');
}
if (!verifyKey.verify(signature: signed.signature, message: message)) {
throw Exception('verify massage failed');
}
// print("signed: ${signed.length}");
return signed.prefix.asTypedList;
}