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Bouncy Castle Cryptography 1.11 API Specification: Class DESEngine
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Bouncy Castle Cryptography 1.11
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org.bouncycastle.crypto.engines
Class DESEngine

java.lang.Object
  |
  +--org.bouncycastle.crypto.engines.DESEngine
All Implemented Interfaces:
BlockCipher
Direct Known 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.
 java.lang.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.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

BLOCK_SIZE

protected static final int BLOCK_SIZE
Constructor Detail

DESEngine

public DESEngine()
standard constructor.
Method Detail

init

public void init(boolean encrypting,
                 CipherParameters params)
initialise a DES cipher.
Specified by:
init in interface BlockCipher
Parameters:
forEncryption - whether or not we are for encryption.
params - the parameters required to set up the cipher.
Throws:
java.lang.IllegalArgumentException - if the params argument is inappropriate.

getAlgorithmName

public java.lang.String getAlgorithmName()
Description copied from interface: BlockCipher
Return the name of the algorithm the cipher implements.
Specified by:
getAlgorithmName in interface BlockCipher
Following copied from interface: org.bouncycastle.crypto.BlockCipher
Returns:
the name of the algorithm the cipher implements.

getBlockSize

public int getBlockSize()
Description copied from interface: BlockCipher
Return the block size for this cipher (in bytes).
Specified by:
getBlockSize in interface BlockCipher
Following copied from interface: org.bouncycastle.crypto.BlockCipher
Returns:
the block size for this cipher in bytes.

processBlock

public int processBlock(byte[] in,
                        int inOff,
                        byte[] out,
                        int outOff)
Description copied from interface: BlockCipher
Process one block of input from the array in and write it to the out array.
Specified by:
processBlock in interface BlockCipher
Following copied from interface: org.bouncycastle.crypto.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.
java.lang.IllegalStateException - if the cipher isn't initialised.

reset

public void reset()
Description copied from interface: BlockCipher
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

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!).

desFunc

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