public Signer GetSigner(Mode mode = Mode.Sign)
{
Signer result = null;
String input = inputText.Text;
switch (algorithmDrowdown.Text)
{
case "Цифровая подпись DSA":
if (dsaForm == null)
{
dsaForm = new DSAForm();
}
if (dsaForm.ShowDialog() == DialogResult.OK)
{
signKey = mode == Mode.Sign ? dsaForm.PrivateKey : dsaForm.PublicKey;
domain = dsaForm.Domain;
result = new DSASigner(dsaForm.Domain);
}
break;
default:
throw new ArgumentException("Выберите метод подписи");
}
return result;
}
public Signer GetSigner(Mode mode = Mode.Sign)
{
Signer result = null;
String input = inputText.Text;
switch (algorithmDrowdown.Text)
{
case "Цифровая подпись DSA":
if (dsaForm == null)
{
dsaForm = new DSAForm();
}
if (dsaForm.ShowDialog() == DialogResult.OK)
{
signKey = mode == Mode.Sign ? dsaForm.PrivateKey : dsaForm.PublicKey;
domain = dsaForm.Domain;
result = new DSASigner(dsaForm.Domain);
}
break;
default:
throw new ArgumentException("Выберите метод подписи");
}
return(result);
}
private void Generate()
{
int minQ = (int)sbMinQ.Value;
int maxQ = (int)sbMaxQ.Value;
Domain = DomainParameters.GenerateDomainParameters(minQ, maxQ);
generator = new DSAKeyGenerator(Domain);
PrivateKey = generator.PrivateKey;
PublicKey = generator.PublicKey;
}
public void GenerateKeys()
{
BigInteger x, y;
x = numbers.Next(0, Domain.Q);
y = BigInteger.ModPow(Domain.G, x, Domain.P);
PrivateKey = new SignKey(x);
PublicKey = new SignKey(y);
}
public BigInteger decryptedDigest(DSASignedString signedText, SignKey key)
{
BigInteger w = signedText.S.ModInverse(Domain.Q);
BigInteger d = digest(signedText.Text);
BigInteger u1 = (d * w) % Domain.Q;
BigInteger u2 = (signedText.R * w) % Domain.Q;
BigInteger v = ((BigInteger.ModPow(Domain.G, u1, Domain.P) * BigInteger.ModPow(key.Value, u2, Domain.P)) % Domain.P) % Domain.Q;
CheckSignatureIntermediateValues = String.Format("W: {0:D}, h(M'): {1:D}, u1: {2:D}, u2: {3:D}, V: {4:D}, R: {5:D}, S: {6:D}, Y: {7:D}", w, d, u1, u2, v, signedText.R, signedText.S, key.Value);
return(v);
}
public DSASignedString sign(string text, SignKey key)
{
BigInteger d;
do
{
K = numbers.Next(1, Domain.Q);
R = BigInteger.ModPow(Domain.G, K, Domain.P) % Domain.Q;
d = digest(text);
S = (K.ModInverse(Domain.Q) * (d + key.Value * R)) % Domain.Q;
} while (R == 0 || S == 0);
SignIntermediateValues = String.Format("K: {0:D}, R: {1:D}, S: {2:D}, h(M): {3:D}, X: {4:D}", K, R, S, d, key.Value);
return(new DSASignedString(text, R, S));
}
public DSASignedString sign(string text, SignKey key)
{
BigInteger d;
do
{
K = numbers.Next(1, Domain.Q);
R = BigInteger.ModPow(Domain.G, K, Domain.P) % Domain.Q;
d = digest(text);
S = (K.ModInverse(Domain.Q) * (d + key.Value * R)) % Domain.Q;
} while (R == 0 || S == 0);
SignIntermediateValues = String.Format("K: {0:D}, R: {1:D}, S: {2:D}, h(M): {3:D}, X: {4:D}", K, R, S, d, key.Value);
return new DSASignedString(text, R, S);
}
public BigInteger decryptedDigest(DSASignedString signedText, SignKey key)
{
BigInteger w = signedText.S.ModInverse(Domain.Q);
BigInteger d = digest(signedText.Text);
BigInteger u1 = (d * w) % Domain.Q;
BigInteger u2 = (signedText.R * w) % Domain.Q;
BigInteger v = ((BigInteger.ModPow(Domain.G, u1, Domain.P) * BigInteger.ModPow(key.Value, u2, Domain.P)) % Domain.P) % Domain.Q;
CheckSignatureIntermediateValues = String.Format("W: {0:D}, h(M'): {1:D}, u1: {2:D}, u2: {3:D}, V: {4:D}, R: {5:D}, S: {6:D}, Y: {7:D}", w, d, u1, u2, v, signedText.R, signedText.S, key.Value);
return v;
}
public bool checkSignature(DSASignedString signedText, SignKey key)
{
return decryptedDigest(signedText, key) == signedText.R;
}
public void GenerateKeys()
{
BigInteger x, y;
x = numbers.Next(0, Domain.Q);
y = BigInteger.ModPow(Domain.G, x, Domain.P);
PrivateKey = new SignKey(x);
PublicKey = new SignKey(y);
}
public bool checkSignature(DSASignedString signedText, SignKey key)
{
return(decryptedDigest(signedText, key) == signedText.R);
}