desengine.java

来自「jtds的源码 是你学习java的好东西」· Java 代码 · 共 518 行 · 第 1/2 页

/*******************************************************************************
 * Class:   : DESEngine
 * Author   : mbrinkley
 * Creation : Nov 11, 2003 2:59:23 PM
 * $Header: /cvsroot/jtds/jtds/src/main/net/sourceforge/jtds/util/DESEngine.java,v 1.3 2004/09/16 20:40:51 matt_brinkley Exp $
 *
 * Version: $Id: DESEngine.java,v 1.3 2004/09/16 20:40:51 matt_brinkley Exp $
 ******************************************************************************/

package net.sourceforge.jtds.util;

/*
import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.DataLengthException;
import org.bouncycastle.crypto.params.KeyParameter;
*/

/**
 * a class that provides a basic DES engine.
 * Modified by Matt Brinkley (mdb) ... mainly just removed depends on external classes.
 *
 * @version $Id: DESEngine.java,v 1.3 2004/09/16 20:40:51 matt_brinkley Exp $
 */
public class DESEngine
//    implements BlockCipher  //mdb
{
    protected static final int  BLOCK_SIZE = 8;

    private int[]               workingKey = null;

    /**
     * standard constructor.
     */
    public DESEngine()
    {
    }

    /**
     * mdb: convenient constructor
     */
    public DESEngine( boolean encrypting, byte[] key )
    {
        init( encrypting, key );
    }

    /**
     * initialise a DES cipher.
     *
     * @param encrypting whether or not we are for encryption.
     * @param key the parameters required to set up the cipher.
     * @exception IllegalArgumentException if the params argument is
     * inappropriate.
     */
    public void init(
        boolean encrypting,
        byte[]  key) //mdb: changed parameter from CipherParameters to byte[]
    {
        workingKey = generateWorkingKey(encrypting, key);

        //mdb: original:
        /*
        if (params instanceof KeyParameter)
        {
            workingKey = generateWorkingKey(encrypting,
                                  ((KeyParameter)params).getKey());

            return;
        }
        throw new IllegalArgumentException("invalid parameter passed to DES init - " + params.getClass().getName());
        */
    }

    public String getAlgorithmName()
    {
        return "DES";
    }

    public int getBlockSize()
    {
        return BLOCK_SIZE;
    }

    public int processBlock(
        byte[] in,
        int inOff,
        byte[] out,
        int outOff)
    {
        if (workingKey == null)
        {
            throw new IllegalStateException("DES engine not initialised");
        }

        if ((inOff + BLOCK_SIZE) > in.length)
        {
            //mdb: used to be DataLengthException
            throw new IllegalArgumentException("input buffer too short");
        }

        if ((outOff + BLOCK_SIZE) > out.length)
        {
            //mdb: used to be DataLengthException
            throw new IllegalArgumentException("output buffer too short");
        }

        desFunc(workingKey, in, inOff, out, outOff);

        return BLOCK_SIZE;
    }

    public void reset()
    {
    }

    /**
     * what follows is mainly taken from "Applied Cryptography", by
     * Bruce Schneier, however it also bears great resemblance to Richard
     * Outerbridge's D3DES...
     */

    static short[]    Df_Key =
        {
            0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,
            0xfe,0xdc,0xba,0x98,0x76,0x54,0x32,0x10,
            0x89,0xab,0xcd,0xef,0x01,0x23,0x45,0x67
        };

    static short[]    bytebit =
        {
            0200, 0100, 040, 020, 010, 04, 02, 01
        };

    static int[]    bigbyte =
        {
            0x800000, 0x400000, 0x200000, 0x100000,
            0x80000,  0x40000,  0x20000,  0x10000,
            0x8000,      0x4000,   0x2000,   0x1000,
            0x800,    0x400,    0x200,    0x100,
            0x80,      0x40,        0x20,     0x10,
            0x8,      0x4,      0x2,      0x1
        };

    /*
     * Use the key schedule specified in the Standard (ANSI X3.92-1981).
     */

    static byte[]    pc1 =
        {
            56, 48, 40, 32, 24, 16,  8,   0, 57, 49, 41, 33, 25, 17,
             9,  1, 58, 50, 42, 34, 26,  18, 10,  2, 59, 51, 43, 35,
            62, 54, 46, 38, 30, 22, 14,   6, 61, 53, 45, 37, 29, 21,
            13,  5, 60, 52, 44, 36, 28,  20, 12,  4, 27, 19, 11,  3
        };

    static byte[] totrot =
        {
            1, 2, 4, 6, 8, 10, 12, 14,
            15, 17, 19, 21, 23, 25, 27, 28
        };

    static byte[] pc2 =
        {
            13, 16, 10, 23,  0,  4,  2, 27, 14,  5, 20,  9,
            22, 18, 11,  3, 25,  7, 15,  6, 26, 19, 12,  1,
            40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
            43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
        };

    static int[] SP1 = {
        0x01010400, 0x00000000, 0x00010000, 0x01010404,
        0x01010004, 0x00010404, 0x00000004, 0x00010000,
        0x00000400, 0x01010400, 0x01010404, 0x00000400,
        0x01000404, 0x01010004, 0x01000000, 0x00000004,
        0x00000404, 0x01000400, 0x01000400, 0x00010400,
        0x00010400, 0x01010000, 0x01010000, 0x01000404,
        0x00010004, 0x01000004, 0x01000004, 0x00010004,
        0x00000000, 0x00000404, 0x00010404, 0x01000000,
        0x00010000, 0x01010404, 0x00000004, 0x01010000,
        0x01010400, 0x01000000, 0x01000000, 0x00000400,
        0x01010004, 0x00010000, 0x00010400, 0x01000004,
        0x00000400, 0x00000004, 0x01000404, 0x00010404,
        0x01010404, 0x00010004, 0x01010000, 0x01000404,
        0x01000004, 0x00000404, 0x00010404, 0x01010400,
        0x00000404, 0x01000400, 0x01000400, 0x00000000,
        0x00010004, 0x00010400, 0x00000000, 0x01010004
    };

    static int[] SP2 = {
        0x80108020, 0x80008000, 0x00008000, 0x00108020,
        0x00100000, 0x00000020, 0x80100020, 0x80008020,
        0x80000020, 0x80108020, 0x80108000, 0x80000000,
        0x80008000, 0x00100000, 0x00000020, 0x80100020,
        0x00108000, 0x00100020, 0x80008020, 0x00000000,
        0x80000000, 0x00008000, 0x00108020, 0x80100000,
        0x00100020, 0x80000020, 0x00000000, 0x00108000,
        0x00008020, 0x80108000, 0x80100000, 0x00008020,
        0x00000000, 0x00108020, 0x80100020, 0x00100000,
        0x80008020, 0x80100000, 0x80108000, 0x00008000,
        0x80100000, 0x80008000, 0x00000020, 0x80108020,
        0x00108020, 0x00000020, 0x00008000, 0x80000000,
        0x00008020, 0x80108000, 0x00100000, 0x80000020,
        0x00100020, 0x80008020, 0x80000020, 0x00100020,
        0x00108000, 0x00000000, 0x80008000, 0x00008020,
        0x80000000, 0x80100020, 0x80108020, 0x00108000
    };

    static int[] SP3 = {
        0x00000208, 0x08020200, 0x00000000, 0x08020008,
        0x08000200, 0x00000000, 0x00020208, 0x08000200,
        0x00020008, 0x08000008, 0x08000008, 0x00020000,
        0x08020208, 0x00020008, 0x08020000, 0x00000208,
        0x08000000, 0x00000008, 0x08020200, 0x00000200,
        0x00020200, 0x08020000, 0x08020008, 0x00020208,
        0x08000208, 0x00020200, 0x00020000, 0x08000208,
        0x00000008, 0x08020208, 0x00000200, 0x08000000,
        0x08020200, 0x08000000, 0x00020008, 0x00000208,
        0x00020000, 0x08020200, 0x08000200, 0x00000000,
        0x00000200, 0x00020008, 0x08020208, 0x08000200,
        0x08000008, 0x00000200, 0x00000000, 0x08020008,
        0x08000208, 0x00020000, 0x08000000, 0x08020208,
        0x00000008, 0x00020208, 0x00020200, 0x08000008,
        0x08020000, 0x08000208, 0x00000208, 0x08020000,
        0x00020208, 0x00000008, 0x08020008, 0x00020200
    };

    static int[] SP4 = {
        0x00802001, 0x00002081, 0x00002081, 0x00000080,
        0x00802080, 0x00800081, 0x00800001, 0x00002001,
        0x00000000, 0x00802000, 0x00802000, 0x00802081,
        0x00000081, 0x00000000, 0x00800080, 0x00800001,
        0x00000001, 0x00002000, 0x00800000, 0x00802001,
        0x00000080, 0x00800000, 0x00002001, 0x00002080,
        0x00800081, 0x00000001, 0x00002080, 0x00800080,
        0x00002000, 0x00802080, 0x00802081, 0x00000081,
        0x00800080, 0x00800001, 0x00802000, 0x00802081,
        0x00000081, 0x00000000, 0x00000000, 0x00802000,
        0x00002080, 0x00800080, 0x00800081, 0x00000001,
        0x00802001, 0x00002081, 0x00002081, 0x00000080,
        0x00802081, 0x00000081, 0x00000001, 0x00002000,
        0x00800001, 0x00002001, 0x00802080, 0x00800081,
        0x00002001, 0x00002080, 0x00800000, 0x00802001,
        0x00000080, 0x00800000, 0x00002000, 0x00802080
    };

    static int[] SP5 = {
        0x00000100, 0x02080100, 0x02080000, 0x42000100,
        0x00080000, 0x00000100, 0x40000000, 0x02080000,
        0x40080100, 0x00080000, 0x02000100, 0x40080100,
        0x42000100, 0x42080000, 0x00080100, 0x40000000,
        0x02000000, 0x40080000, 0x40080000, 0x00000000,
        0x40000100, 0x42080100, 0x42080100, 0x02000100,
        0x42080000, 0x40000100, 0x00000000, 0x42000000,
        0x02080100, 0x02000000, 0x42000000, 0x00080100,
        0x00080000, 0x42000100, 0x00000100, 0x02000000,
        0x40000000, 0x02080000, 0x42000100, 0x40080100,
        0x02000100, 0x40000000, 0x42080000, 0x02080100,
        0x40080100, 0x00000100, 0x02000000, 0x42080000,
        0x42080100, 0x00080100, 0x42000000, 0x42080100,