public override void ImportParameters(DSAParameters parameters)
{
if (parameters.P == null || parameters.Q == null || parameters.G == null || parameters.Y == null)
{
throw new ArgumentException(SR.Cryptography_InvalidDsaParameters_MissingFields);
}
// J is not required and is not even used on CNG blobs. It should however be less than P (J == (P-1) / Q). This validation check
// is just to maintain parity with DSACryptoServiceProvider, which also performs this check.
if (parameters.J != null && parameters.J.Length >= parameters.P.Length)
{
throw new ArgumentException(SR.Cryptography_InvalidDsaParameters_MismatchedPJ);
}
bool hasPrivateKey = parameters.X != null;
int keySizeInBytes = parameters.P.Length;
int keySizeInBits = keySizeInBytes * 8;
if (parameters.G.Length != keySizeInBytes || parameters.Y.Length != keySizeInBytes)
{
throw new ArgumentException(SR.Cryptography_InvalidDsaParameters_MismatchedPGY);
}
if (hasPrivateKey && parameters.X.Length != parameters.Q.Length)
{
throw new ArgumentException(SR.Cryptography_InvalidDsaParameters_MismatchedQX);
}
using (MemoryStream ms = new MemoryStream())
{
using (BinaryWriter bw = new BinaryWriter(ms))
{
if (keySizeInBits <= MaxV1KeySize)
{
GenerateV1DsaBlob(bw, parameters, keySizeInBytes, hasPrivateKey);
}
else
{
GenerateV2DsaBlob(bw, parameters, keySizeInBytes, hasPrivateKey);
}
}
ms.Flush();
byte[] blob = ms.ToArray();
CngKey cngKey = CngKey.Import(blob, hasPrivateKey ? CngKeyBlobFormat.GenericPrivateBlob : CngKeyBlobFormat.GenericPublicBlob);
CngExportPolicies exportPolicy = cngKey.ExportPolicy | CngExportPolicies.AllowPlaintextExport;
cngKey.SetProperty(new CngProperty(NCryptNative.KeyPropertyName.ExportPolicy, BitConverter.GetBytes((int)exportPolicy), CngPropertyOptions.None));
Key = cngKey;
}
}
public BasicSymmetricCipherLiteNCrypt(
Func <CngKey> cngKeyFactory,
CipherMode cipherMode,
int blockSizeInBytes,
ReadOnlySpan <byte> iv,
bool encrypting,
int paddingSizeInBytes)
{
BlockSizeInBytes = blockSizeInBytes;
PaddingSizeInBytes = paddingSizeInBytes;
_encrypting = encrypting;
_key = cngKeyFactory();
CngProperty chainingModeProperty = cipherMode switch
{
CipherMode.ECB => s_ECBMode,
CipherMode.CBC => s_CBCMode,
CipherMode.CFB => s_CFBMode,
_ => throw new CryptographicException(SR.Cryptography_InvalidCipherMode),
};
_key.SetProperty(chainingModeProperty);
Reset(iv);
}