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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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