private static BigInteger SignPrimative(BigInteger m, RSAPrivateKey key)
{
return DecryptPrimative(m, key);
}
public void Init(ICipherParameters parameters)
{
var pubKeyParams = parameters as PublicKeyParameter;
if (pubKeyParams != null)
{
SecurityAssert.SAssert(pubKeyParams.Key is RSAPublicKey);
pub = (RSAPublicKey)pubKeyParams.Key;
return;
}
var privKeyParams = parameters as PrivateKeyParameter;
if (privKeyParams != null)
{
SecurityAssert.SAssert(privKeyParams.Key is RSAPrivateKey);
priv = (RSAPrivateKey)privKeyParams.Key;
pub = (RSAPublicKey)priv.PublicKey;
return;
}
throw new InvalidCastException();
}
private static BigInteger DecryptPrimative(BigInteger c, RSAPrivateKey key)
{
SecurityAssert.SAssert(c >= 0 && c < key.Modulus);
return BigInteger.ModPow(c, key.PrivateExponent, key.Modulus);
}