public RsaBlindingParameters(
RsaKeyParameters publicKey,
BigInteger blindingFactor)
{
if (publicKey.IsPrivate)
throw new ArgumentException("RSA parameters should be for a public key");
this.publicKey = publicKey;
this.blindingFactor = blindingFactor;
}
/**
* Initialise the factor generator
*
* @param param the necessary RSA key parameters.
*/
public void Init(
ICipherParameters param)
{
if (param is ParametersWithRandom)
{
ParametersWithRandom rParam = (ParametersWithRandom)param;
key = (RsaKeyParameters)rParam.Parameters;
random = rParam.Random;
}
else
{
key = (RsaKeyParameters)param;
random = new SecureRandom();
}
if (key.IsPrivate)
throw new ArgumentException("generator requires RSA public key");
}
public static RSAParameters ToRSAParameters(RsaKeyParameters rsaKey)
{
RSAParameters rp = new RSAParameters();
rp.Modulus = rsaKey.Modulus.ToByteArrayUnsigned();
if (rsaKey.IsPrivate)
rp.D = ConvertRSAParametersField(rsaKey.Exponent, rp.Modulus.Length);
else
rp.Exponent = rsaKey.Exponent.ToByteArrayUnsigned();
return rp;
}
public static RSA ToRSA(RsaKeyParameters rsaKey)
{
// TODO This appears to not work for private keys (when no CRT info)
return CreateRSAProvider(ToRSAParameters(rsaKey));
}
public static AsymmetricCipherKeyPair GetRsaKeyPair(
RSAParameters rp)
{
BigInteger modulus = new BigInteger(1, rp.Modulus);
BigInteger pubExp = new BigInteger(1, rp.Exponent);
RsaKeyParameters pubKey = new RsaKeyParameters(
false,
modulus,
pubExp);
RsaPrivateCrtKeyParameters privKey = new RsaPrivateCrtKeyParameters(
modulus,
pubExp,
new BigInteger(1, rp.D),
new BigInteger(1, rp.P),
new BigInteger(1, rp.Q),
new BigInteger(1, rp.DP),
new BigInteger(1, rp.DQ),
new BigInteger(1, rp.InverseQ));
return new AsymmetricCipherKeyPair(pubKey, privKey);
}
/**
* initialise the RSA engine.
*
* @param forEncryption true if we are encrypting, false otherwise.
* @param param the necessary RSA key parameters.
*/
public void Init(
bool forEncryption,
ICipherParameters parameters)
{
if (parameters is ParametersWithRandom)
{
parameters = ((ParametersWithRandom) parameters).Parameters;
}
if (!(parameters is RsaKeyParameters))
throw new InvalidKeyException("Not an RSA key");
this.key = (RsaKeyParameters) parameters;
this.forEncryption = forEncryption;
this.bitSize = key.Modulus.BitLength;
}
/**
* Initialise the blinding engine.
*
* @param forEncryption true if we are encrypting (blinding), false otherwise.
* @param param the necessary RSA key parameters.
*/
public void Init(
bool forEncryption,
ICipherParameters param)
{
RsaBlindingParameters p;
if (param is ParametersWithRandom)
{
ParametersWithRandom rParam = (ParametersWithRandom)param;
p = (RsaBlindingParameters)rParam.Parameters;
}
else
{
p = (RsaBlindingParameters)param;
}
core.Init(forEncryption, p.PublicKey);
this.forEncryption = forEncryption;
this.key = p.PublicKey;
this.blindingFactor = p.BlindingFactor;
}
/**
* initialise the RSA engine.
*
* @param forEncryption true if we are encrypting, false otherwise.
* @param param the necessary RSA key parameters.
*/
public void Init(
bool forEncryption,
ICipherParameters param)
{
core.Init(forEncryption, param);
if (param is ParametersWithRandom)
{
ParametersWithRandom rParam = (ParametersWithRandom)param;
key = (RsaKeyParameters)rParam.Parameters;
random = rParam.Random;
}
else
{
key = (RsaKeyParameters)param;
random = new SecureRandom();
}
}
