/// <summary>
/// <para>
/// ImportParameters will replace the existing key that Gost3410Cng is working with by creating a
/// new CngKey for the parameters structure.
/// </para>
/// </summary>
/// <exception cref="ArgumentException">
/// if <paramref name="parameters" /> contains neither an exponent nor a modulus.
/// </exception>
/// <exception cref="CryptographicException">
/// if <paramref name="parameters" /> is not a valid RSA key or if <paramref name="parameters"
/// /> is a full key pair and the default KSP is used.
/// </exception>
public override void ImportParameters(Gost3410Parameters parameters) ///!!!!!!
{
unsafe
{
bool includePrivate = true;
int blobSize = sizeof(BCRYPT_GOSTKEY_BLOB);
byte[] gostBlob = new byte[blobSize];
fixed(byte *pgostBlob = &gostBlob[0])
{
// Build the header
BCRYPT_GOSTKEY_BLOB *pBcryptBlob = (BCRYPT_GOSTKEY_BLOB *)pgostBlob;
pBcryptBlob->PublicKeyParamSet = parameters.PublicKeyParamSet.Length;
pBcryptBlob->DigestParamSet = parameters.DigestParamSet.Length;
pBcryptBlob->EncryptionParamSet = parameters.EncryptionParamSet.Length;
pBcryptBlob->PublicKey = parameters.PublicKey.Length * 8;
pBcryptBlob->PrivateKey = parameters.PrivateKey.Length * 8;
int offset = sizeof(BCRYPT_GOSTKEY_BLOB);
Interop.BCrypt.Emit(gostBlob, ref offset, parameters.PublicKeyParamSet);
Interop.BCrypt.Emit(gostBlob, ref offset, parameters.DigestParamSet);
Interop.BCrypt.Emit(gostBlob, ref offset, parameters.EncryptionParamSet);
Interop.BCrypt.Emit(gostBlob, ref offset, parameters.PublicKey);
Interop.BCrypt.Emit(gostBlob, ref offset, parameters.PrivateKey);
// We better have computed the right allocation size above!
Debug.Assert(offset == blobSize, "offset == blobSize");
}
ImportKeyBlob(gostBlob, includePrivate);
}
}
private static void ExportParameters(ref Gost3410Parameters gostParams, byte[] gostBlob, bool includePrivateParameters)
{
unsafe
{
// Fail-fast if a rogue provider gave us a blob that isn't even the size of the blob header.
if (gostBlob.Length < sizeof(BCRYPT_GOSTKEY_BLOB))
throw new CryptographicException(ErrorCode.E_FAIL.ToString());
fixed(byte *pGostBlob = &gostBlob[0])
{
BCRYPT_GOSTKEY_BLOB *pBcryptBlob = (BCRYPT_GOSTKEY_BLOB *)pGostBlob;
int offset = sizeof(BCRYPT_GOSTKEY_BLOB);
gostParams.PublicKeyParamSet = Interop.BCrypt.Consume(gostBlob, ref offset, pBcryptBlob->PublicKeyParamSet);
gostParams.DigestParamSet = Interop.BCrypt.Consume(gostBlob, ref offset, pBcryptBlob->DigestParamSet);
gostParams.EncryptionParamSet = Interop.BCrypt.Consume(gostBlob, ref offset, pBcryptBlob->EncryptionParamSet);
gostParams.PublicKey = Interop.BCrypt.Consume(gostBlob, ref offset, pBcryptBlob->PublicKey);
gostParams.PrivateKey = Interop.BCrypt.Consume(gostBlob, ref offset, pBcryptBlob->PrivateKey);
}
}
}
