verify method
Verify a signature against the original data
Implementation
@override
/// Verify a signature against the original data
bool verify(List<int> data, List<int> signature) {
final signer = RSASigner(SHA256Digest(), '0609608648016503040201');
signer.init(false, PublicKeyParameter<RSAPublicKey>(_pubKey));
final rsaSignature = RSASignature(Uint8List.fromList(signature));
return signer.verifySignature(Uint8List.fromList(data), rsaSignature);
}