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using System;
using Org.BouncyCastle.Crypto.Parameters;
namespace Org.BouncyCastle.Crypto.Engines
{
/**
* The no-op engine that just copies bytes through, irrespective of whether encrypting and decrypting.
* Provided for the sake of completeness.
*/
public class NullEngine
: IBlockCipher
{
private bool initialised;
private const int BlockSize = 1;
public NullEngine()
{
}
public void Init(
bool forEncryption,
ICipherParameters parameters)
{
// we don't mind any parameters that may come in
initialised = true;
}
public string AlgorithmName
{
get { return "Null"; }
}
public bool IsPartialBlockOkay
{
get { return true; }
}
public int GetBlockSize()
{
return BlockSize;
}
public int ProcessBlock(
byte[] input,
int inOff,
byte[] output,
int outOff)
{
if (!initialised)
throw new InvalidOperationException("Null engine not initialised");
if ((inOff + BlockSize) > input.Length)
throw new DataLengthException("input buffer too short");
if ((outOff + BlockSize) > output.Length)
throw new DataLengthException("output buffer too short");
for (int i = 0; i < BlockSize; ++i)
{
output[outOff + i] = input[inOff + i];
}
return BlockSize;
}
public void Reset()
{
// nothing needs to be done
}
}
}
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