Class DES

java.lang.Object
com.trilead.ssh2.crypto.cipher.DES
All Implemented Interfaces:
BlockCipher
Direct Known Subclasses:
DESede
public class DES extends Object implements BlockCipher
DES.
Version:
$Id: DES.java,v 1.1 2007/10/15 12:49:55 cplattne Exp $

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    (package private) static int[]
    bigbyte
     
    (package private) static short[]
    bytebit
     
    (package private) static short[]
    Df_Key
    what follows is mainly taken from "Applied Cryptography", by Bruce Schneier, however it also bears great resemblance to Richard Outerbridge's D3DES...
    (package private) static byte[]
    pc1
     
    (package private) static byte[]
    pc2
     
    (package private) static int[]
    SP1
     
    (package private) static int[]
    SP2
     
    (package private) static int[]
    SP3
     
    (package private) static int[]
    SP4
     
    (package private) static int[]
    SP5
     
    (package private) static int[]
    SP6
     
    (package private) static int[]
    SP7
     
    (package private) static int[]
    SP8
     
    (package private) static byte[]
    totrot
     
    private int[]
    workingKey
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    DES()
    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, int off)
    generate an integer based working key based on our secret key and what we processing we are planning to do.
    String
    getAlgorithmName()
     
    int
    getBlockSize()
     
    void
    init(boolean encrypting, byte[] key)
    initialise a DES cipher.
    void
    reset()
     
    void
    transformBlock(byte[] in, int inOff, byte[] out, int outOff)
     

    Methods inherited from class Object

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

  • Field Details

    • workingKey

      private int[] workingKey

    • Df_Key

      static short[] Df_Key
      what follows is mainly taken from "Applied Cryptography", by Bruce Schneier, however it also bears great resemblance to Richard Outerbridge's D3DES...

    • bytebit

      static short[] bytebit

    • bigbyte

      static int[] bigbyte

    • pc1

      static byte[] pc1

    • totrot

      static byte[] totrot

    • pc2

      static byte[] pc2

    • SP1

      static int[] SP1

    • SP2

      static int[] SP2

    • SP3

      static int[] SP3

    • SP4

      static int[] SP4

    • SP5

      static int[] SP5

    • SP6

      static int[] SP6

    • SP7

      static int[] SP7

    • SP8

      static int[] SP8

  • Constructor Details

    • DES

      public DES()
      standard constructor.

  • Method Details

    • init

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

    • getAlgorithmName

      public String getAlgorithmName()

    • getBlockSize

      public int getBlockSize()
      Specified by:
      getBlockSize in interface BlockCipher

    • transformBlock

      public void transformBlock(byte[] in, int inOff, byte[] out, int outOff)
      Specified by:
      transformBlock in interface BlockCipher

    • reset

      public void reset()

    • generateWorkingKey

      protected int[] generateWorkingKey(boolean encrypting, byte[] key, int off)
      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!).

      Parameters:
      encrypting - the encrypting
      key - the key
      off - the off
      Returns:
      the int [ ]

    • desFunc

      protected void desFunc(int[] wKey, byte[] in, int inOff, byte[] out, int outOff)
      the DES engine.
      Parameters:
      wKey - the w key
      in - the in
      inOff - the in off
      out - the out
      outOff - the out off