private void button2_Click(object sender, EventArgs ea)
{
ECGost3410Signer signer = new ECGost3410Signer();
ECPublicKeyParameters pubKey = new ECPublicKeyParameters(
"ECGOST3410",
new FpPoint(curve,
new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicX)), // x
new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicY))), // y
parameters);
BigInteger H = TextBoxToBigInteger16(tbH);
BigInteger rs = TextBoxToBigInteger16(tbrs);
BigInteger ss = TextBoxToBigInteger16(tbss);
BigInteger q = parameters.N;
//FpPoint G = (FpPoint)parameters.G;
//FpPoint Q = new FpPoint(curve, new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicX)), new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicY)));
BigInteger e = H.Mod(q);
byte[] ee = e.ToByteArray();
byte[] message = H.ToByteArray();
Array.Reverse(message);
signer.Init(false, pubKey);
MessageBox.Show(signer.VerifySignature(message, rs, ss).ToString(), "Проверка подписи");
//FpPoint C = (FpPoint)(G.Multiply(e.ModInverse(q).Multiply(ss).Mod(q)).Subtract(Q.Multiply(e.ModInverse(q).Multiply(rs).Mod(q))));
//BigInteger x = C.X.ToBigInteger();
}
/// <summary>
/// Verifies a signature to be authentic
/// </summary>
/// <param name="originalSignature">The signature which is be verified</param>
/// <param name="publicKey">the public key used for the verification</param>
/// <param name="data">the data which is signed</param>
/// <returns>true if signature is authentic, false if not</returns>
public bool Verify(byte[] originalSignature, byte[] publicKey, byte[] data)
{
ECPublicKeyParameters pubKey = null;
try
{
pubKey = (ECPublicKeyParameters)CreateAsymmetricKeyParameterFromPublicKeyInfo(publicKey);
}
catch (InvalidCastException exception)
{
string message = "Public Key Import Failed!\n" +
$"{exception.Message}.\n" +
"The contents of the source do not represent a valid EC key parameter\n" +
"Verify that the key is not corrupted.\n" +
"- or - Verify that the correct key is selected.";
throw new CryptoException(message, exception);
}
var signer = new ECGost3410Signer();
signer.Init(false, pubKey);
var r = new byte[originalSignature.Length / 2];
var s = new byte[originalSignature.Length / 2];
Array.Copy(originalSignature, r, r.Length);
Array.Copy(originalSignature, r.Length, s, 0, s.Length);
var R = new BigInteger(1, r);
var S = new BigInteger(1, s);
return(signer.VerifySignature(data, R, S));
}
/**
* Test Sign and Verify with test parameters
* see: http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-01.txt
* gostR3410-2001-TestParamSet P.46
*/
private void ecGOST3410_TestParam()
{
SecureRandom random = new SecureRandom();
BigInteger mod_p = new BigInteger("57896044618658097711785492504343953926634992332820282019728792003956564821041"); //p
BigInteger mod_q = new BigInteger("57896044618658097711785492504343953927082934583725450622380973592137631069619");
FpCurve curve = new FpCurve(
mod_p, // p
new BigInteger("7"), // a
new BigInteger("43308876546767276905765904595650931995942111794451039583252968842033849580414"), // b
mod_q, BigInteger.One);
ECDomainParameters parameters = new ECDomainParameters(
curve,
curve.CreatePoint(
new BigInteger("2"), // x
new BigInteger("4018974056539037503335449422937059775635739389905545080690979365213431566280")), // y
mod_q);
ECKeyPairGenerator pGen = new ECKeyPairGenerator();
ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(
parameters,
random);
pGen.Init(genParam);
AsymmetricCipherKeyPair pair = pGen.GenerateKeyPair();
ParametersWithRandom param = new ParametersWithRandom(pair.Private, random);
ECGost3410Signer ecgost3410 = new ECGost3410Signer();
ecgost3410.Init(true, param);
//get hash message using the digest GOST3411.
byte[] message = Encoding.ASCII.GetBytes("Message for sign");
Gost3411Digest gost3411 = new Gost3411Digest();
gost3411.BlockUpdate(message, 0, message.Length);
byte[] hashmessage = new byte[gost3411.GetDigestSize()];
gost3411.DoFinal(hashmessage, 0);
BigInteger[] sig = ecgost3410.GenerateSignature(hashmessage);
ecgost3410.Init(false, pair.Public);
if (!ecgost3410.VerifySignature(hashmessage, sig[0], sig[1]))
{
Fail("signature fails");
}
}
/**
* Test Sign and Verify with C parameters
* see: http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-01.txt
* gostR3410-2001-CryptoPro-C-ParamSet P.48
*/
private void ecGOST3410_CParam()
{
SecureRandom random = new SecureRandom();
BigInteger mod_p = new BigInteger("70390085352083305199547718019018437841079516630045180471284346843705633502619"); //p
BigInteger mod_q = new BigInteger("70390085352083305199547718019018437840920882647164081035322601458352298396601");
FpCurve curve = new FpCurve(
mod_p, // p
new BigInteger("70390085352083305199547718019018437841079516630045180471284346843705633502616"), // a
new BigInteger("32858"), // b
mod_q, BigInteger.One);
ECDomainParameters parameters = new ECDomainParameters(
curve,
curve.CreatePoint(
new BigInteger("0"), // x
new BigInteger("29818893917731240733471273240314769927240550812383695689146495261604565990247")), // y
mod_q);
ECKeyPairGenerator pGen = new ECKeyPairGenerator("ECGOST3410");
ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(
parameters,
random);
pGen.Init(genParam);
AsymmetricCipherKeyPair pair = pGen.GenerateKeyPair();
ParametersWithRandom param = new ParametersWithRandom(pair.Private, random);
ECGost3410Signer ecgost3410 = new ECGost3410Signer();
ecgost3410.Init(true, param);
BigInteger[] sig = ecgost3410.GenerateSignature(hashmessage);
ecgost3410.Init(false, pair.Public);
if (!ecgost3410.VerifySignature(hashmessage, sig[0], sig[1]))
{
Fail("signature fails");
}
}
/**
* Test Sign and Verify with B parameters
* see: http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-01.txt
* gostR3410-2001-CryptoPro-B-ParamSet P.47-48
*/
private void ecGOST3410_BParam()
{
SecureRandom random = new SecureRandom();
BigInteger mod_p = new BigInteger("57896044618658097711785492504343953926634992332820282019728792003956564823193"); //p
BigInteger mod_q = new BigInteger("57896044618658097711785492504343953927102133160255826820068844496087732066703");
FpCurve curve = new FpCurve(
mod_p, // p
new BigInteger("57896044618658097711785492504343953926634992332820282019728792003956564823190"), // a
new BigInteger("28091019353058090096996979000309560759124368558014865957655842872397301267595"), // b
mod_q, BigInteger.One);
ECDomainParameters parameters = new ECDomainParameters(
curve,
curve.CreatePoint(
new BigInteger("1"), // x
new BigInteger("28792665814854611296992347458380284135028636778229113005756334730996303888124")), // y
mod_q);
ECKeyPairGenerator pGen = new ECKeyPairGenerator("ECGOST3410");
ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(
parameters,
random);
pGen.Init(genParam);
AsymmetricCipherKeyPair pair = pGen.GenerateKeyPair();
ParametersWithRandom param = new ParametersWithRandom(pair.Private, random);
ECGost3410Signer ecgost3410 = new ECGost3410Signer();
ecgost3410.Init(true, param);
BigInteger[] sig = ecgost3410.GenerateSignature(hashmessage);
ecgost3410.Init(false, pair.Public);
if (!ecgost3410.VerifySignature(hashmessage, sig[0], sig[1]))
{
Fail("signature fails");
}
}
/**
* Test Sign and Verify with A parameters
* see: http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-01.txt
* gostR3410-2001-CryptoPro-A-ParamSet P.47
*/
public void ecGOST3410_AParam()
{
SecureRandom random = new SecureRandom();
BigInteger mod_p = new BigInteger("115792089237316195423570985008687907853269984665640564039457584007913129639319"); //p
BigInteger mod_q = new BigInteger("115792089237316195423570985008687907853073762908499243225378155805079068850323");
FpCurve curve = new FpCurve(
mod_p, // p
new BigInteger("115792089237316195423570985008687907853269984665640564039457584007913129639316"), // a
new BigInteger("166"), // b
mod_q, BigInteger.One);
ECDomainParameters parameters = new ECDomainParameters(
curve,
curve.CreatePoint(
new BigInteger("1"), // x
new BigInteger("64033881142927202683649881450433473985931760268884941288852745803908878638612")), // y
mod_q);
ECKeyPairGenerator pGen = new ECKeyPairGenerator("ECGOST3410");
ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(
parameters,
random);
pGen.Init(genParam);
AsymmetricCipherKeyPair pair = pGen.GenerateKeyPair();
ParametersWithRandom param = new ParametersWithRandom(pair.Private, random);
ECGost3410Signer ecgost3410 = new ECGost3410Signer();
ecgost3410.Init(true, param);
BigInteger[] sig = ecgost3410.GenerateSignature(hashmessage);
ecgost3410.Init(false, pair.Public);
if (!ecgost3410.VerifySignature(hashmessage, sig[0], sig[1]))
{
Fail("signature fails");
}
}
private bool VerifyGost(byte[] buffer, int length, byte[] signature)
{
ECDomainParameters dParams = ECGost3410NamedCurves.GetByOid(CryptoProObjectIdentifiers.GostR3410x2001CryptoProA);
byte[] reversedPublicKey = PublicKey.Reverse().ToArray();
ECPoint q = dParams.Curve.CreatePoint(new BigInteger(1, reversedPublicKey, 32, 32), new BigInteger(1, reversedPublicKey, 0, 32), false);
ECPublicKeyParameters parameters = new ECPublicKeyParameters(q, dParams);
var signer = new ECGost3410Signer();
signer.Init(false, parameters);
var digest = new Gost3411Digest();
digest.BlockUpdate(buffer, 0, length);
byte[] hash = new byte[digest.GetDigestSize()];
digest.DoFinal(hash, 0);
return(signer.VerifySignature(hash, new BigInteger(1, signature, 32, 32), new BigInteger(1, signature, 0, 32)));
}
private void ecGOST3410_TEST()
{
BigInteger mod_p = new BigInteger("57896044618658097711785492504343953926634992332820282019728792003956564821041"); //p
BigInteger mod_q = new BigInteger("57896044618658097711785492504343953927082934583725450622380973592137631069619");
FpCurve curve = new FpCurve(
mod_p, // p
new BigInteger("7"), // a
new BigInteger("43308876546767276905765904595650931995942111794451039583252968842033849580414"), // b
mod_q, BigInteger.One);
ECDomainParameters parameters = new ECDomainParameters(
curve,
curve.CreatePoint(
new BigInteger("2"), // x
new BigInteger("4018974056539037503335449422937059775635739389905545080690979365213431566280")), // y
mod_q);
ECPrivateKeyParameters priKey = new ECPrivateKeyParameters(
"ECGOST3410",
new BigInteger("55441196065363246126355624130324183196576709222340016572108097750006097525544"), // d
parameters);
ParametersWithRandom param = new ParametersWithRandom(priKey, k);
ECGost3410Signer ecgost3410 = new ECGost3410Signer();
ecgost3410.Init(true, param);
byte[] mVal = new BigInteger("20798893674476452017134061561508270130637142515379653289952617252661468872421").ToByteArray();
byte[] message = new byte[mVal.Length];
for (int i = 0; i != mVal.Length; i++)
{
message[i] = mVal[mVal.Length - 1 - i];
}
BigInteger[] sig = ecgost3410.GenerateSignature(message);
if (!r.Equals(sig[0]))
{
Fail("r component wrong.", r, sig[0]);
}
if (!s.Equals(sig[1]))
{
Fail("s component wrong.", s, sig[1]);
}
// Verify the signature
ECPublicKeyParameters pubKey = new ECPublicKeyParameters(
"ECGOST3410",
curve.CreatePoint(
new BigInteger("57520216126176808443631405023338071176630104906313632182896741342206604859403"), // x
new BigInteger("17614944419213781543809391949654080031942662045363639260709847859438286763994")), // y
parameters);
ecgost3410.Init(false, pubKey);
if (!ecgost3410.VerifySignature(message, sig[0], sig[1]))
{
Fail("verification fails");
}
}
private void button2_Click(object sender, EventArgs ea)
{
FpPoint G = (FpPoint)parameters.G;
FpPoint Q = new FpPoint(curve, new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicX)), new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicY)));
FpPoint C = new FpPoint(curve, new FpFieldElement(mod_p, TextBoxToBigInteger16(tbCX)), new FpFieldElement(mod_p, TextBoxToBigInteger16(tbCY)));
BigInteger mu = TextBoxToBigInteger16(tbVoterMu);
BigInteger epsilon = TextBoxToBigInteger16(tbVoterEpsilon);
BigInteger delta = TextBoxToBigInteger16(tbVoterDelta);
BigInteger tau = TextBoxToBigInteger16(tbVoterTau);
BigInteger q = parameters.N;
FpPoint Cs = (FpPoint)G.Multiply(epsilon).Add(Q.Multiply(mu)).Add(C.Multiply(delta.ModInverse(q)));
tbCsX.Text = Cs.X.ToBigInteger().ToString(16);
tbCsY.Text = Cs.Y.ToBigInteger().ToString(16);
BigInteger H = TextBoxToBigInteger16(tbH);
//BigInteger q = parameters.N;
//BigInteger mu = TextBoxToBigInteger16(tbVoterMu);
//BigInteger delta = TextBoxToBigInteger16(tbVoterDelta);
//BigInteger tau = TextBoxToBigInteger16(tbVoterTau);
BigInteger csx = TextBoxToBigInteger16(tbCsX);
BigInteger rs = csx.Mod(q);
BigInteger es = H.Mod(q);
BigInteger r = (tau.Multiply(delta).Multiply(rs.Add(mu.Multiply(es)))).Mod(q);
BigInteger e = (es.Multiply(tau)).Mod(q);
tbrs.Text = rs.ToString(16);
tbr.Text = r.ToString(16);
tbes.Text = es.ToString(16);
tbe.Text = e.ToString(16);
BigInteger k = TextBoxToBigInteger16(tbk);
//BigInteger e = TextBoxToBigInteger16(tbe);
BigInteger d = TextBoxToBigInteger16(tbValPrivate);
//BigInteger r = TextBoxToBigInteger16(tbr);
//BigInteger q = parameters.N;
BigInteger s = (k.Multiply(e).Add(d.Multiply(r))).Mod(q);
tbs.Text = s.ToString(16);
BigInteger ss = (s.Multiply(delta.ModInverse(q)).Multiply(tau.ModInverse(q)).Mod(q).Add(epsilon.Multiply(es).Mod(q))).Mod(q);
tbss.Text = ss.ToString(16);
ECGost3410Signer signer = new ECGost3410Signer();
ECPublicKeyParameters pubKey = new ECPublicKeyParameters(
"ECGOST3410",
new FpPoint(curve,
new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicX)), // x
new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicY))), // y
parameters);
//BigInteger H = TextBoxToBigInteger16(tbH);
//BigInteger rs = TextBoxToBigInteger16(tbrs);
//BigInteger ss = TextBoxToBigInteger16(tbss);
//BigInteger q = parameters.N;
//FpPoint G = (FpPoint)parameters.G;
//FpPoint Q = new FpPoint(curve, new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicX)), new FpFieldElement(mod_p, TextBoxToBigInteger16(tbValPublicY)));
//BigInteger e = H.Mod(q);
byte[] ee = e.ToByteArray();
byte[] message = H.ToByteArray();
Array.Reverse(message);
signer.Init(false, pubKey);
MessageBox.Show(signer.VerifySignature(message, rs, ss).ToString(), "Проверка подписи");
//FpPoint C = (FpPoint)(G.Multiply(e.ModInverse(q).Multiply(ss).Mod(q)).Subtract(Q.Multiply(e.ModInverse(q).Multiply(rs).Mod(q))));
//BigInteger x = C.X.ToBigInteger();
}