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