internal MagmaManagedTransform(
byte[] rgbKey,
byte[] rgbIV,
int blockSize,
CipherMode cipherMode,
PaddingMode paddingMode,
SymmetricTransformMode transformMode)
: base(rgbKey, rgbIV, blockSize, cipherMode, paddingMode, transformMode)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="SymmetricTransform" /> class.
/// </summary>
/// <param name="key">
/// The secret key to be used for the symmetric algorithm.
/// </param>
/// <param name="iv">
/// The initialization vector (<see cref="SymmetricAlgorithm.IV" />) to be used
/// for the symmetric algorithm.
/// </param>
/// <param name="blockSize">
/// The block size, in bits, of the cryptographic operation.
/// </param>
/// <param name="cipherMode">
/// The mode for operation of the symmetric transform.
/// </param>
/// <param name="paddingMode">
/// The padding mode used in the symmetric transform.
/// </param>
/// <param name="transformMode">
/// The direction mode of the symmetric transform.
/// </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="key"/> parameter is <see langword="null"/>.
/// </exception>
/// <exception cref="ArgumentNullException">
/// <paramref name="iv"/> parameter is <see langword="null"/> when <paramref name="cipherMode"/> value is
/// <see cref="CipherMode.CBC"/>, <see cref="CipherMode.CFB"/> or <see cref="CipherMode.OFB"/>.
/// </exception>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="blockSize"/> parameter is non-positive.
/// </exception>
/// <exception cref="CryptographicException">
/// <paramref name="cipherMode"/> parameter value is not supported.
/// </exception>
protected SymmetricTransform(
byte[] key,
byte[]?iv,
int blockSize,
CipherMode cipherMode,
PaddingMode paddingMode,
SymmetricTransformMode transformMode)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
if (blockSize <= 0)
{
throw new ArgumentOutOfRangeException(nameof(blockSize),
CryptographyStrings.ArgumentOutOfRangeNeedPositiveNum);
}
_transformMode = transformMode;
InputBlockSize = blockSize / 8;
_cipherMode = cipherMode;
_paddingMode = paddingMode;
switch (_cipherMode)
{
case CipherMode.ECB:
break;
case CipherMode.CBC:
case CipherMode.CFB:
case CipherMode.OFB:
if (iv == null)
{
throw new ArgumentNullException(nameof(iv));
}
_rgbIV = (byte[])iv.Clone();
_stateBuffer = new byte[_rgbIV.Length];
_tempBuffer = new byte[InputBlockSize];
Reset();
break;
default:
throw new CryptographicException(CryptographyStrings.CryptographicInvalidCipherMode);
}
_rgbKey = (byte[])key.Clone();
}
private ICryptoTransform CreateTransform(byte[] rgbKey, byte[] rgbIV, SymmetricTransformMode transformMode) => new SimpleSymmetricTransform(rgbKey, rgbIV, BlockSizeValue, ModeValue, PaddingValue, transformMode);
