package org.bouncycastle.shaded.crypto;
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/**
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* Block cipher engines are expected to conform to this interface.
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*/
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public interface BlockCipher
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{
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/**
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* Initialise the cipher.
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*
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* @param forEncryption if true the cipher is initialised for
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* encryption, if false for decryption.
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* @param params the key and other data required by the cipher.
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* @exception IllegalArgumentException if the params argument is
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* inappropriate.
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*/
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public void init(boolean forEncryption, CipherParameters params)
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throws IllegalArgumentException;
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/**
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* Return the name of the algorithm the cipher implements.
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*
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* @return the name of the algorithm the cipher implements.
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*/
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public String getAlgorithmName();
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/**
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* Return the block size for this cipher (in bytes).
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*
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* @return the block size for this cipher in bytes.
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*/
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public int getBlockSize();
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/**
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* Process one block of input from the array in and write it to
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* the out array.
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*
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* @param input the array containing the input data.
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* @param inOff offset into the in array the data starts at.
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* @param output the array the output data will be copied into.
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* @param outOff the offset into the out array the output will start at.
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* @exception DataLengthException if there isn't enough data in input , or
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* space in out.
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* @exception IllegalStateException if the cipher isn't initialised.
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* @return the number of bytes processed and produced.
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*/
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public int processBlock(byte[] input, int inOff, byte[] output, int outOff)
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throws DataLengthException, IllegalStateException;
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/**
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* Reset the cipher. After resetting the cipher is in the same state
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* as it was after the last init (if there was one).
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*/
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public void reset();
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}
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