publicVerify function
Implementation
bool publicVerify(String strPublicKey, String message, String strSignature) {
ECPublicKey publicKey = loadPublicKey(strPublicKey);
ECDSASigner verifySinger =
new ECDSASigner(SHA512Digest(), new Mac('SHA-512/HMAC'));
var pubkeyParam = new PublicKeyParameter(
new ECPublicKey(publicKey.Q, publicKey.parameters));
final str_r = strSignature.substring(0, 64);
final str_s = strSignature.substring(64, 128);
final r = BigInt.parse(str_r, radix: 16);
final s = BigInt.parse(str_s, radix: 16);
ECSignature signature = new ECSignature(r, s);
verifySinger.init(false, pubkeyParam);
return verifySinger.verifySignature(
Uint8List.fromList(convert.utf8.encode(message)), signature);
}