public override void ImportParameters(RSAParameters parameters)
{
if (parameters.Exponent == null || parameters.Modulus == null)
{
throw new ArgumentException(SR.GetString(SR.Cryptography_InvalidRsaParameters));
}
bool publicOnly = parameters.P == null || parameters.Q == null;
//
// We need to build a key blob structured as follows:
// BCRYPT_RSAKEY_BLOB header
// byte[cbPublicExp] publicExponent - Exponent
// byte[cbModulus] modulus - Modulus
// -- Private only --
// byte[cbPrime1] prime1 - P
// byte[cbPrime2] prime2 - Q
//
int blobSize = Marshal.SizeOf(typeof(BCryptNative.BCRYPT_RSAKEY_BLOB)) +
parameters.Exponent.Length +
parameters.Modulus.Length;
if (!publicOnly)
{
blobSize += parameters.P.Length +
parameters.Q.Length;
}
byte[] rsaBlob = new byte[blobSize];
unsafe
{
fixed(byte *pRsaBlob = rsaBlob)
{
// Build the header
BCryptNative.BCRYPT_RSAKEY_BLOB *pBcryptBlob = (BCryptNative.BCRYPT_RSAKEY_BLOB *)pRsaBlob;
pBcryptBlob->Magic = publicOnly ? BCryptNative.KeyBlobMagicNumber.RsaPublic :
BCryptNative.KeyBlobMagicNumber.RsaPrivate;
pBcryptBlob->BitLength = parameters.Modulus.Length * 8;
pBcryptBlob->cbPublicExp = parameters.Exponent.Length;
pBcryptBlob->cbModulus = parameters.Modulus.Length;
if (!publicOnly)
{
pBcryptBlob->cbPrime1 = parameters.P.Length;
pBcryptBlob->cbPrime2 = parameters.Q.Length;
}
int offset = Marshal.SizeOf(typeof(BCryptNative.BCRYPT_RSAKEY_BLOB));
// Copy the exponent
Buffer.BlockCopy(parameters.Exponent, 0, rsaBlob, offset, parameters.Exponent.Length);
offset += parameters.Exponent.Length;
// Copy the modulus
Buffer.BlockCopy(parameters.Modulus, 0, rsaBlob, offset, parameters.Modulus.Length);
offset += parameters.Modulus.Length;
if (!publicOnly)
{
// Copy P
Buffer.BlockCopy(parameters.P, 0, rsaBlob, offset, parameters.P.Length);
offset += parameters.P.Length;
// Copy Q
Buffer.BlockCopy(parameters.Q, 0, rsaBlob, offset, parameters.Q.Length);
offset += parameters.Q.Length;
}
}
}
Key = CngKey.Import(rsaBlob, publicOnly ? s_rsaPublicBlob : s_rsaPrivateBlob);
}
internal static Exception HashAlgorithmNameNullOrEmpty()
{
return(new ArgumentException(SR.GetString(SR.Cryptography_HashAlgorithmNameNullOrEmpty), "hashAlgorithm"));
}
private static Exception DerivedClassMustOverride()
{
return(new NotImplementedException(SR.GetString(SR.NotSupported_SubclassOverride)));
}
/// <summary>
/// When overridden in a derived class, generates a new public/private keypair for the specified curve.
/// </summary>
/// <param name="curve">The curve to use.</param>
public virtual void GenerateKey(ECCurve curve)
{
throw new NotSupportedException(SR.GetString(SR.NotSupported_SubclassOverride));
}
/// <summary>
/// When overridden in a derived class, imports the specified ECParameters.
/// </summary>
/// <param name="parameters">The curve parameters.</param>
public virtual void ImportParameters(ECParameters parameters)
{
throw new NotSupportedException(SR.GetString(SR.NotSupported_SubclassOverride));
}
/// <summary>
/// When overridden in a derived class, exports the explicit ECParameters for an ECCurve.
/// </summary>
/// <param name="includePrivateParameters">true to include private parameters, otherwise, false.</param>
/// <returns>The ECParameters representing the point on the curve for this key, using the explicit curve format.</returns>
public virtual ECParameters ExportExplicitParameters(bool includePrivateParameters)
{
throw new NotSupportedException(SR.GetString(SR.NotSupported_SubclassOverride));
}
