org.bouncycastle.crypto.engines

Class NullEngine

Implemented Interfaces:
BlockCipher

public class NullEngine
extends java.lang.Object
implements BlockCipher

The no-op engine that just copies bytes through, irrespective of whether encrypting and decrypting. Provided for the sake of completeness.

Field Summary

protected static int
BLOCK_SIZE

Constructor Summary

NullEngine()
Standard constructor.

Method Summary

String
getAlgorithmName()
Return the name of the algorithm the cipher implements.
int
getBlockSize()
Return the block size for this cipher (in bytes).
void
init(boolean forEncryption, CipherParameters params)
Initialise the cipher.
int
processBlock(byte[] in, int inOff, byte[] out, int outOff)
Process one block of input from the array in and write it to the out array.
void
reset()
Reset the cipher.

Field Details

BLOCK_SIZE

protected static final int BLOCK_SIZE

Field Value:
1

Constructor Details

NullEngine

public NullEngine()
Standard constructor.

Method Details

getAlgorithmName

public String getAlgorithmName()
Return the name of the algorithm the cipher implements.
Specified by:
getAlgorithmName in interface BlockCipher

Returns:
the name of the algorithm the cipher implements.


getBlockSize

public int getBlockSize()
Return the block size for this cipher (in bytes).
Specified by:
getBlockSize in interface BlockCipher

Returns:
the block size for this cipher in bytes.


init

public void init(boolean forEncryption,
                 CipherParameters params)
            throws IllegalArgumentException
Initialise the cipher.
Specified by:
init in interface BlockCipher

Parameters:
forEncryption - if true the cipher is initialised for encryption, if false for decryption.
params - the key and other data required by the cipher.


processBlock

public int processBlock(byte[] in,
                        int inOff,
                        byte[] out,
                        int outOff)
            throws DataLengthException,
                   IllegalStateException
Process one block of input from the array in and write it to the out array.
Specified by:
processBlock in interface BlockCipher

Parameters:
in - the array containing the input data.
inOff - offset into the in array the data starts at.
out - the array the output data will be copied into.
outOff - the offset into the out array the output will start at.

Returns:
the number of bytes processed and produced.

Throws:
DataLengthException - if there isn't enough data in in, or space in out.


reset

public void reset()
Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).
Specified by:
reset in interface BlockCipher