/// <summary>
/// Gets the signing stream.
/// </summary>
/// <returns></returns>
public HashingStream GetSigningStream(Keyczar keyczar)
{
var digest = PublicKey.GetDigest();
var signer = new DsaDigestSigner(new DsaSigner(), digest);
var param = new DsaPrivateKeyParameters(X.ToBouncyBigInteger(),
new DsaParameters(PublicKey.P.ToBouncyBigInteger(),
PublicKey.Q.ToBouncyBigInteger(),
PublicKey.G.ToBouncyBigInteger()));
signer.Init(forSigning: true, parameters: new ParametersWithRandom(param, Secure.Random));
return(new DigestStream(signer));
}