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 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 bool checkSignature(DSASignedString signedText, SignKey key)
{
return(decryptedDigest(signedText, key) == signedText.R);
}