/// <summary>
/// Low level RSA Process function for use with private key.
/// Should never be used; Because without padding RSA is vulnerable to attacks. Use with caution.
/// </summary>
/// <param name="PlainText">Data to encrypt. Length must be less than Modulus size in octets.</param>
/// <param name="usePrivate">True to use Private key, else Public.</param>
/// <returns>Encrypted Data</returns>
public byte[] RSAProcess(byte[] PlainText, bool usePrivate)
{
if (usePrivate && !rsaParams.Has_PRIVATE_Info)
{
throw new CryptographicException("RSA Process: Incomplete Private Key Info");
}
if ((usePrivate == false) && !rsaParams.Has_PUBLIC_Info)
{
throw new CryptographicException("RSA Process: Incomplete Public Key Info");
}
BigInteger _E;
if (usePrivate)
{
_E = rsaParams.D;
}
else
{
_E = rsaParams.E;
}
var PT = RSAProviderUtils.OS2IP(PlainText, false);
var M = BigInteger.ModPow(PT, _E, rsaParams.N);
if (M.Sign == -1)
{
return(RSAProviderUtils.I2OSP(M + rsaParams.N, rsaParams.OctetsInModulus, false));
}
return(RSAProviderUtils.I2OSP(M, rsaParams.OctetsInModulus, false));
}
/// <summary>
/// Low level RSA Decryption function for use with private key. Uses CRT and is Much faster.
/// Should never be used; Because without padding RSA is vulnerable to attacks. Use with caution.
/// </summary>
/// <param name="Data">Data to encrypt. Length must be less than Modulus size in octets.</param>
/// <returns>Encrypted Data</returns>
public byte[] RSADecryptPrivateCRT(byte[] Data)
{
if (rsaParams.Has_PRIVATE_Info && rsaParams.HasCRTInfo)
{
BigInteger C = RSAProviderUtils.OS2IP(Data, false);
BigInteger M1 = BigInteger.ModPow(C, rsaParams.DP, rsaParams.P);
BigInteger M2 = BigInteger.ModPow(C, rsaParams.DQ, rsaParams.Q);
BigInteger H = ((M1 - M2) * rsaParams.InverseQ) % rsaParams.P;
BigInteger M = (M2 + (rsaParams.Q * H));
if (M.Sign == -1)
{
return(RSAProviderUtils.I2OSP(M + rsaParams.N, rsaParams.OctetsInModulus, false));
}
else
{
return(RSAProviderUtils.I2OSP(M, rsaParams.OctetsInModulus, false));
}
}
else
{
throw new CryptographicException("RSA Decrypt CRT: Incomplete Key Info");
}
}
/// <summary>
/// Initialize the RSA class. Only the public parameters.
/// </summary>
/// <param name="Modulus">Modulus of the RSA key.</param>
/// <param name="Exponent">Exponent of the RSA key</param>
/// <param name="ModulusSize">Modulus size in number of bits. Ex: 512, 1024, 2048, 4096 etc.</param>
public RSAProviderParameters(byte[] Modulus, byte[] Exponent, int ModulusSize)
{
// rsaParams;
OctetsInModulus = ModulusSize / 8;
E = RSAProviderUtils.OS2IP(Exponent, false);
N = RSAProviderUtils.OS2IP(Modulus, false);
Has_PUBLIC_Info = true;
}
/// <summary>
/// Initialize the RSA class.
/// </summary>
/// <param name="Modulus">Modulus of the RSA key.</param>
/// <param name="Exponent">Exponent of the RSA key</param>
/// /// <param name="D">Exponent of the RSA key</param>
/// <param name="ModulusSize">Modulus size in number of bits. Ex: 512, 1024, 2048, 4096 etc.</param>
public RSAProviderParameters(byte[] Modulus, byte[] Exponent, byte [] D, int ModulusSize)
{
// rsaParams;
_ModulusOctets = ModulusSize / 8;
_E = RSAProviderUtils.OS2IP(Exponent, false);
_N = RSAProviderUtils.OS2IP(Modulus, false);
_D = RSAProviderUtils.OS2IP(D, false);
_Has_PUBLIC_Info = true;
_Has_PRIVATE_Info = true;
}
/// <summary>
/// Initialize the RSA class. It's assumed that both the Public and Extended Private info are there.
/// </summary>
/// <param name="rsaParams">Preallocated RSAParameters containing the required keys.</param>
/// <param name="ModulusSize">Modulus size in bits</param>
public RSAProviderParameters(RSAParameters rsaParams, int ModulusSize)
{
// rsaParams;
OctetsInModulus = ModulusSize / 8;
E = RSAProviderUtils.OS2IP(rsaParams.Exponent, false);
D = RSAProviderUtils.OS2IP(rsaParams.D, false);
N = RSAProviderUtils.OS2IP(rsaParams.Modulus, false);
P = RSAProviderUtils.OS2IP(rsaParams.P, false);
Q = RSAProviderUtils.OS2IP(rsaParams.Q, false);
DP = RSAProviderUtils.OS2IP(rsaParams.DP, false);
DQ = RSAProviderUtils.OS2IP(rsaParams.DQ, false);
InverseQ = RSAProviderUtils.OS2IP(rsaParams.InverseQ, false);
HasCRTInfo = true;
Has_PUBLIC_Info = true;
Has_PRIVATE_Info = true;
}
/// <summary>
/// Initialize the RSA class. For CRT.
/// </summary>
/// <param name="Modulus">Modulus of the RSA key.</param>
/// <param name="Exponent">Exponent of the RSA key</param>
/// /// <param name="D">Exponent of the RSA key</param>
/// <param name="P">P paramater of RSA Algorithm.</param>
/// <param name="Q">Q paramater of RSA Algorithm.</param>
/// <param name="DP">DP paramater of RSA Algorithm.</param>
/// <param name="DQ">DQ paramater of RSA Algorithm.</param>
/// <param name="InverseQ">InverseQ paramater of RSA Algorithm.</param>
/// <param name="ModulusSize">Modulus size in number of bits. Ex: 512, 1024, 2048, 4096 etc.</param>
public RSAProviderParameters(byte[] Modulus, byte[] Exponent, byte[] D, byte[] P, byte [] Q, byte [] DP, byte [] DQ, byte [] InverseQ, int ModulusSize)
{
// rsaParams;
_ModulusOctets = ModulusSize / 8;
_E = RSAProviderUtils.OS2IP(Exponent, false);
_N = RSAProviderUtils.OS2IP(Modulus, false);
_D = RSAProviderUtils.OS2IP(D, false);
_P = RSAProviderUtils.OS2IP(P, false);
_Q = RSAProviderUtils.OS2IP(Q, false);
_DP = RSAProviderUtils.OS2IP(DP, false);
_DQ = RSAProviderUtils.OS2IP(DQ, false);
_InverseQ = RSAProviderUtils.OS2IP(InverseQ, false);
_Has_CRT_Info = true;
_Has_PUBLIC_Info = true;
_Has_PRIVATE_Info = true;
}
/// <summary>
/// Initialize the RSA class. It's assumed that both the Public and Extended Private info are there.
/// </summary>
/// <param name="rsaParams">Preallocated RSAParameters containing the required keys.</param>
/// <param name="ModulusSize">Modulus size in bits</param>
public RSAProviderParameters(RSAParameters rsaParams, int ModulusSize)
{
// rsaParams;
_ModulusOctets = ModulusSize / 8;
_E = RSAProviderUtils.OS2IP(rsaParams.Exponent, false);
_D = RSAProviderUtils.OS2IP(rsaParams.D, false);
_N = RSAProviderUtils.OS2IP(rsaParams.Modulus, false);
_P = RSAProviderUtils.OS2IP(rsaParams.P, false);
_Q = RSAProviderUtils.OS2IP(rsaParams.Q, false);
_DP = RSAProviderUtils.OS2IP(rsaParams.DP, false);
_DQ = RSAProviderUtils.OS2IP(rsaParams.DQ, false);
_InverseQ = RSAProviderUtils.OS2IP(rsaParams.InverseQ, false);
_Has_CRT_Info = true;
_Has_PUBLIC_Info = true;
_Has_PRIVATE_Info = true;
}
/// <summary>
/// Initialize the RSA class. For CRT.
/// </summary>
/// <param name="Modulus">Modulus of the RSA key.</param>
/// <param name="Exponent">Exponent of the RSA key</param>
/// ///
/// <param name="D">Exponent of the RSA key</param>
/// <param name="P">P paramater of RSA Algorithm.</param>
/// <param name="Q">Q paramater of RSA Algorithm.</param>
/// <param name="DP">DP paramater of RSA Algorithm.</param>
/// <param name="DQ">DQ paramater of RSA Algorithm.</param>
/// <param name="InverseQ">InverseQ paramater of RSA Algorithm.</param>
/// <param name="ModulusSize">Modulus size in number of bits. Ex: 512, 1024, 2048, 4096 etc.</param>
public RSAProviderParameters(byte[] Modulus, byte[] Exponent, byte[] D, byte[] P, byte[] Q, byte[] DP, byte[] DQ,
byte[] InverseQ, int ModulusSize)
{
// rsaParams;
OctetsInModulus = ModulusSize / 8;
E = RSAProviderUtils.OS2IP(Exponent, false);
N = RSAProviderUtils.OS2IP(Modulus, false);
this.D = RSAProviderUtils.OS2IP(D, false);
this.P = RSAProviderUtils.OS2IP(P, false);
this.Q = RSAProviderUtils.OS2IP(Q, false);
this.DP = RSAProviderUtils.OS2IP(DP, false);
this.DQ = RSAProviderUtils.OS2IP(DQ, false);
this.InverseQ = RSAProviderUtils.OS2IP(InverseQ, false);
HasCRTInfo = true;
Has_PUBLIC_Info = true;
Has_PRIVATE_Info = true;
}
