public HKeyExchange(int exponent, string modulus, string privateExponent) :
this()
{
var keys = new RSAParameters();
Exponent = new BigInteger(exponent);
keys.Exponent = Exponent.ToByteArray();
Modulus = BigInteger.Parse("0" + modulus, NumberStyles.HexNumber);
keys.Modulus = Modulus.ToByteArray();
Array.Reverse(keys.Modulus);
if (!string.IsNullOrWhiteSpace(privateExponent))
{
PrivateExponent = BigInteger.Parse("0" + privateExponent, NumberStyles.HexNumber);
keys.D = PrivateExponent.ToByteArray();
Array.Reverse(keys.D);
GenerateDHPrimes(256);
GenerateDHKeys(DHPrime, DHGenerator);
}
RSA = new RSACryptoServiceProvider();
RSA.ImportParameters(keys);
_blockSize = (RSA.KeySize -
RSA.LegalKeySizes[0].SkipSize) / 8;
}
/// <summary>
/// Gets the signing stream.
/// </summary>
/// <returns></returns>
public HashingStream GetSigningStream(Keyczar keyczar)
{
var signer = PublicKey.GetSigner();
signer.Init(forSigning: true, parameters: new RsaPrivateCrtKeyParameters(
Utility.ToBouncyBigInteger(PublicKey.Modulus),
Utility.ToBouncyBigInteger(PublicKey.PublicExponent),
PrivateExponent.ToBouncyBigInteger(),
PrimeP.ToBouncyBigInteger(),
PrimeQ.ToBouncyBigInteger(),
PrimeExponentP.ToBouncyBigInteger(),
PrimeExponentQ.ToBouncyBigInteger(),
CrtCoefficient.ToBouncyBigInteger()));
return(new DigestStream(signer, Size / 8));
}
/// <summary>
/// Gets the decrypting stream.
/// </summary>
/// <param name="output">The output.</param>
/// <returns></returns>
public FinishingStream GetDecryptingStream(Stream output, Keyczar keyczar)
{
var rsa = new RsaEngine();
var oaep = PublicKey.UpdatePadding(rsa);
return(new AsymmetricStream(oaep, output,
(cipher, encrypt) => cipher.Init(encrypt, new RsaPrivateCrtKeyParameters(
PublicKey.Modulus
.ToBouncyBigInteger(),
PublicKey.PublicExponent
.ToBouncyBigInteger(),
PrivateExponent.ToBouncyBigInteger
(),
PrimeP.ToBouncyBigInteger(),
PrimeQ.ToBouncyBigInteger(),
PrimeExponentP.ToBouncyBigInteger(),
PrimeExponentQ.ToBouncyBigInteger(),
CrtCoefficient.ToBouncyBigInteger())),
encrypt: false));
}
public HKeyExchange(int exponent, string modulus, string privateExponent)
{
Exponent = new BigInteger(exponent);
Modulus = BigInteger.Parse("0" + modulus, NumberStyles.HexNumber);
var keys = new RSAParameters
{
Exponent = Exponent.ToByteArray(isBigEndian: true),
Modulus = Modulus.ToByteArray(isBigEndian: true)
};
if (!string.IsNullOrWhiteSpace(privateExponent))
{
PrivateExponent = BigInteger.Parse("0" + privateExponent, NumberStyles.HexNumber);
keys.D = PrivateExponent.ToByteArray(isBigEndian: true);
GenerateDHPrimes(256);
GenerateDHKeys(DHPrime, DHGenerator);
}
RSA = RSA.Create(keys);
}
