Package 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 Object
implements BlockCipher
a class that provides a basic DES engine.

  • Field Summary

    Fields
    Modifier and Type Field Description
    protected static int BLOCK_SIZE  

  • Constructor Summary

    Constructors
    Constructor Description
    DESEngine()
    standard constructor.

  • Method Summary

    Modifier and Type Method Description
    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.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

  • Constructor Details

    • DESEngine

      public DESEngine()
      standard constructor.

  • Method Details

    • 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.
      Throws:
      IllegalArgumentException - if the params argument is inappropriate.

    • getAlgorithmName

      public String getAlgorithmName()
      Description copied from interface: BlockCipher
      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()
      Description copied from interface: BlockCipher
      Return the block size for this cipher (in bytes).
      Specified by:
      getBlockSize in interface 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
      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()
      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.