Package com.trilead.ssh2.crypto.cipher

Class DES

  • All Implemented Interfaces:
    BlockCipher
    Direct Known Subclasses:
    DESede
    public class DES
extends java.lang.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

      All Methods Instance Methods Concrete Methods 
      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.
      java.lang.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 java.lang.Object

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

    • Field Detail

      • 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 Detail

      • DES

        public DES()
        standard constructor.

    • Method Detail

      • 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:
        java.lang.IllegalArgumentException - if the params argument is inappropriate.

      • getAlgorithmName

        public java.lang.String getAlgorithmName()

      • 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!).

      • desFunc

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