verifySignature method
Verify the message
against the signature
.
Implementation
@override
bool verifySignature(Uint8List message, Signature signature) {
var isNormalized =
(signature as ECSignature).isNormalized(signer._pbkey!.parameters!);
var isVerified = signer.verifySignature(message, signature);
// Constant time.
return (isNormalized | !enforceNormalized) & isVerified;
}