| protected static DesFunc ( int wKey, byte input, int inOff, byte outBytes, int outOff ) : void | ||
| wKey | int | The w key. |
| input | byte | The input. |
| inOff | int | The in off. |
| outBytes | byte | The out bytes. |
| outOff | int | The out off. |
| return | void | |
/// <summary>
/// Encrypts the specified region of the input byte array and copies the encrypted data to the specified region of the output byte array.
/// </summary>
/// <param name="inputBuffer">The input data to encrypt.</param>
/// <param name="inputOffset">The offset into the input byte array from which to begin using data.</param>
/// <param name="inputCount">The number of bytes in the input byte array to use as data.</param>
/// <param name="outputBuffer">The output to which to write encrypted data.</param>
/// <param name="outputOffset">The offset into the output byte array from which to begin writing data.</param>
/// <returns>
/// The number of bytes encrypted.
/// </returns>
public override int EncryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
if ((inputOffset + this.BlockSize) > inputBuffer.Length)
{
throw new IndexOutOfRangeException("input buffer too short");
}
if ((outputOffset + this.BlockSize) > outputBuffer.Length)
{
throw new IndexOutOfRangeException("output buffer too short");
}
if (this._encryptionKey1 == null || this._encryptionKey2 == null || this._encryptionKey3 == null)
{
var part1 = new byte[8];
var part2 = new byte[8];
Buffer.BlockCopy(this.Key, 0, part1, 0, 8);
Buffer.BlockCopy(this.Key, 8, part2, 0, 8);
this._encryptionKey1 = this.GenerateWorkingKey(true, part1);
this._encryptionKey2 = this.GenerateWorkingKey(false, part2);
if (this.Key.Length == 24)
{
var part3 = new byte[8];
Buffer.BlockCopy(this.Key, 16, part3, 0, 8);
this._encryptionKey3 = this.GenerateWorkingKey(true, part3);
}
else
{
this._encryptionKey3 = this._encryptionKey1;
}
}
byte[] temp = new byte[this.BlockSize];
DesCipher.DesFunc(this._encryptionKey1, inputBuffer, inputOffset, temp, 0);
DesCipher.DesFunc(this._encryptionKey2, temp, 0, temp, 0);
DesCipher.DesFunc(this._encryptionKey3, temp, 0, outputBuffer, outputOffset);
return(this.BlockSize);
}
/// <summary>
/// Decrypts the specified region of the input byte array and copies the decrypted data to the specified region of the output byte array.
/// </summary>
/// <param name="inputBuffer">The input data to decrypt.</param>
/// <param name="inputOffset">The offset into the input byte array from which to begin using data.</param>
/// <param name="inputCount">The number of bytes in the input byte array to use as data.</param>
/// <param name="outputBuffer">The output to which to write decrypted data.</param>
/// <param name="outputOffset">The offset into the output byte array from which to begin writing data.</param>
/// <returns>
/// The number of bytes decrypted.
/// </returns>
public override int DecryptBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
if ((inputOffset + this.BlockSize) > inputBuffer.Length)
{
throw new IndexOutOfRangeException("input buffer too short");
}
if ((outputOffset + this.BlockSize) > outputBuffer.Length)
{
throw new IndexOutOfRangeException("output buffer too short");
}
if (this._decryptionKey == null)
{
this._decryptionKey = GenerateWorkingKey(false, this.Key);
}
DesCipher.DesFunc(this._decryptionKey, inputBuffer, inputOffset, outputBuffer, outputOffset);
return(this.BlockSize);
}
