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