org.bouncycastle.crypto.engines

Class DESEngine

Implemented Interfaces:
BlockCipher
Known Direct Subclasses:
DESedeEngine

public class DESEngine
extends java.lang.Object
implements BlockCipher

a class that provides a basic DES engine.

Field Summary

protected static int
BLOCK_SIZE

Constructor Summary

DESEngine()
standard constructor.

Method Summary

protected void
desFunc(int[] wKey, byte[] in, int inOff, byte[] out, int outOff)
the DES engine.
protected int[]
generateWorkingKey(boolean encrypting, byte[] key)
generate an integer based working key based on our secret key and what we processing we are planning to do.
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 encrypting, CipherParameters params)
initialise a DES 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:
8

Constructor Details

DESEngine

public DESEngine()
standard constructor.

Method Details

desFunc

protected void desFunc(int[] wKey,
                       byte[] in,
                       int inOff,
                       byte[] out,
                       int outOff)
the DES engine.


generateWorkingKey

protected int[] generateWorkingKey(boolean encrypting,
                                   byte[] key)
generate an integer based working key based on our secret key and what we processing we are planning to do. Acknowledgements for this routine go to James Gillogly & Phil Karn. (whoever, and wherever they are!).


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 encrypting,
                 CipherParameters params)
initialise a DES cipher.
Specified by:
init in interface BlockCipher

Parameters:
encrypting - whether or not we are for encryption.
params - the parameters required to set up the cipher.


processBlock

public 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.
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.


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