private bool isProcessingOkay(
RsaKeyParameters pub,
RsaKeyParameters prv,
byte[] data,
SecureRandom random)
{
RsaBlindingFactorGenerator blindFactorGen = new RsaBlindingFactorGenerator();
RsaBlindingEngine blindingEngine = new RsaBlindingEngine();
PssSigner blindSigner = new PssSigner(blindingEngine, new Sha1Digest(), 20);
PssSigner pssEng = new PssSigner(new RsaEngine(), new Sha1Digest(), 20);
random.NextBytes(data);
blindFactorGen.Init(pub);
BigInteger blindFactor = blindFactorGen.GenerateBlindingFactor();
RsaBlindingParameters parameters = new RsaBlindingParameters(pub, blindFactor);
// generate a blind signature
blindSigner.Init(true, new ParametersWithRandom(parameters, random));
blindSigner.BlockUpdate(data, 0, data.Length);
byte[] blindedData = blindSigner.GenerateSignature();
RsaEngine signerEngine = new RsaEngine();
signerEngine.Init(true, prv);
byte[] blindedSig = signerEngine.ProcessBlock(blindedData, 0, blindedData.Length);
// unblind the signature
blindingEngine.Init(false, parameters);
byte[] s = blindingEngine.ProcessBlock(blindedSig, 0, blindedSig.Length);
//verify signature with PssSigner
pssEng.Init(false, pub);
pssEng.BlockUpdate(data, 0, data.Length);
return pssEng.VerifySignature(s);
}
private void testSig(
int id,
RsaKeyParameters pub,
RsaKeyParameters prv,
byte[] slt,
byte[] msg,
byte[] sig)
{
RsaBlindingFactorGenerator blindFactorGen = new RsaBlindingFactorGenerator();
RsaBlindingEngine blindingEngine = new RsaBlindingEngine();
PssSigner blindSigner = new PssSigner(blindingEngine, new Sha1Digest(), 20);
PssSigner signer = new PssSigner(new RsaEngine(), new Sha1Digest(), 20);
blindFactorGen.Init(pub);
BigInteger blindFactor = blindFactorGen.GenerateBlindingFactor();
RsaBlindingParameters parameters = new RsaBlindingParameters(pub, blindFactor);
// generate a blind signature
blindSigner.Init(true, new ParametersWithRandom(parameters, new FixedRandom(slt)));
blindSigner.BlockUpdate(msg, 0, msg.Length);
byte[] blindedData = blindSigner.GenerateSignature();
RsaEngine signerEngine = new RsaEngine();
signerEngine.Init(true, prv);
byte[] blindedSig = signerEngine.ProcessBlock(blindedData, 0, blindedData.Length);
// unblind the signature
blindingEngine.Init(false, parameters);
byte[] s = blindingEngine.ProcessBlock(blindedSig, 0, blindedSig.Length);
//signature verification
if (!AreEqual(s, sig))
{
Fail("test " + id + " failed generation");
}
//verify signature with PssSigner
signer.Init(false, pub);
signer.BlockUpdate(msg, 0, msg.Length);
if (!signer.VerifySignature(s))
{
Fail("test " + id + " failed PssSigner verification");
}
}