public bool VerifySignature(AsymmetricKeyParameter publicKey, byte[] data, byte[] signature)
{
Org.BouncyCastle.Crypto.ISigner signer = SignerUtilities.GetSigner(Algorithm);
signer.Init(false, publicKey);
signer.BlockUpdate(data, 0, data.Length);
return(signer.VerifySignature(signature));
}
public bool SignatureIsValid(string signature, string contents, string publicKey)
{
var curve = SecNamedCurves.GetByName("secp256k1");
var domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);
var publicKeyBytes = Base58Encoding.Decode(publicKey);
var q = curve.Curve.DecodePoint(publicKeyBytes);
var keyParameters = new ECPublicKeyParameters(q, domain);
Org.BouncyCastle.Crypto.ISigner signer = SignerUtilities.GetSigner("SHA-256withECDSA");
signer.Init(false, keyParameters);
signer.BlockUpdate(Encoding.ASCII.GetBytes(contents), 0, contents.Length);
var signatureBytes = Base58Encoding.Decode(signature);
return(signer.VerifySignature(signatureBytes));
}
