?? nullengine.java
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package org.bouncycastle.crypto.engines;import org.bouncycastle.crypto.BlockCipher;import org.bouncycastle.crypto.CipherParameters;import org.bouncycastle.crypto.DataLengthException;/** * The no-op engine that just copies bytes through, irrespective of whether encrypting and decrypting. * Provided for the sake of completeness. */public class NullEngine implements BlockCipher{ protected static final int BLOCK_SIZE = 1; /** * Standard constructor. */ public NullEngine() { super(); } /* (non-Javadoc) * @see org.bouncycastle.crypto.BlockCipher#init(boolean, org.bouncycastle.crypto.CipherParameters) */ public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException { // we don't mind any parameters that may come in } /* (non-Javadoc) * @see org.bouncycastle.crypto.BlockCipher#getAlgorithmName() */ public String getAlgorithmName() { return "Null"; } /* (non-Javadoc) * @see org.bouncycastle.crypto.BlockCipher#getBlockSize() */ public int getBlockSize() { return BLOCK_SIZE; } /* (non-Javadoc) * @see org.bouncycastle.crypto.BlockCipher#processBlock(byte[], int, byte[], int) */ public int processBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, IllegalStateException { if ((inOff + BLOCK_SIZE) > in.length) { throw new DataLengthException("input buffer too short"); } if ((outOff + BLOCK_SIZE) > out.length) { throw new DataLengthException("output buffer too short"); } for (int i = 0; i < BLOCK_SIZE; ++i) { out[outOff + i] = in[inOff + i]; } return BLOCK_SIZE; } /* (non-Javadoc) * @see org.bouncycastle.crypto.BlockCipher#reset() */ public void reset() { // nothing needs to be done }}?? 快捷鍵說明
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