Package org.bouncycastle.crypto.engines

Class 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

      Fields 
      Modifier and Type Field Description
      protected static int BLOCK_SIZE  

    • Constructor Summary

      Constructors 
      Constructor Description
      DESEngine()
      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)
      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

    • 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:
        encrypting - 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
        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.