cast5engine.java

来自「《移动Agent技术》一书的所有章节源代码。」· Java 代码 · 共 835 行 · 第 1/3 页

0x264f620f, 0x24b8d2bf, 0x15c1b79e, 0x46a52564, 0xf8d7e54e, 0x3e378160, 0x7895cda5, 0x859c15a5,
0xe6459788, 0xc37bc75f, 0xdb07ba0c, 0x0676a3ab, 0x7f229b1e, 0x31842e7b, 0x24259fd7, 0xf8bef472,
0x835ffcb8, 0x6df4c1f2, 0x96f5b195, 0xfd0af0fc, 0xb0fe134c, 0xe2506d3d, 0x4f9b12ea, 0xf215f225,
0xa223736f, 0x9fb4c428, 0x25d04979, 0x34c713f8, 0xc4618187, 0xea7a6e98, 0x7cd16efc, 0x1436876c,
0xf1544107, 0xbedeee14, 0x56e9af27, 0xa04aa441, 0x3cf7c899, 0x92ecbae6, 0xdd67016d, 0x151682eb,
0xa842eedf, 0xfdba60b4, 0xf1907b75, 0x20e3030f, 0x24d8c29e, 0xe139673b, 0xefa63fb8, 0x71873054,
0xb6f2cf3b, 0x9f326442, 0xcb15a4cc, 0xb01a4504, 0xf1e47d8d, 0x844a1be5, 0xbae7dfdc, 0x42cbda70,
0xcd7dae0a, 0x57e85b7a, 0xd53f5af6, 0x20cf4d8c, 0xcea4d428, 0x79d130a4, 0x3486ebfb, 0x33d3cddc,
0x77853b53, 0x37effcb5, 0xc5068778, 0xe580b3e6, 0x4e68b8f4, 0xc5c8b37e, 0x0d809ea2, 0x398feb7c,
0x132a4f94, 0x43b7950e, 0x2fee7d1c, 0x223613bd, 0xdd06caa2, 0x37df932b, 0xc4248289, 0xacf3ebc3,
0x5715f6b7, 0xef3478dd, 0xf267616f, 0xc148cbe4, 0x9052815e, 0x5e410fab, 0xb48a2465, 0x2eda7fa4,
0xe87b40e4, 0xe98ea084, 0x5889e9e1, 0xefd390fc, 0xdd07d35b, 0xdb485694, 0x38d7e5b2, 0x57720101,
0x730edebc, 0x5b643113, 0x94917e4f, 0x503c2fba, 0x646f1282, 0x7523d24a, 0xe0779695, 0xf9c17a8f,
0x7a5b2121, 0xd187b896, 0x29263a4d, 0xba510cdf, 0x81f47c9f, 0xad1163ed, 0xea7b5965, 0x1a00726e,
0x11403092, 0x00da6d77, 0x4a0cdd61, 0xad1f4603, 0x605bdfb0, 0x9eedc364, 0x22ebe6a8, 0xcee7d28a,
0xa0e736a0, 0x5564a6b9, 0x10853209, 0xc7eb8f37, 0x2de705ca, 0x8951570f, 0xdf09822b, 0xbd691a6c,
0xaa12e4f2, 0x87451c0f, 0xe0f6a27a, 0x3ada4819, 0x4cf1764f, 0x0d771c2b, 0x67cdb156, 0x350d8384,
0x5938fa0f, 0x42399ef3, 0x36997b07, 0x0e84093d, 0x4aa93e61, 0x8360d87b, 0x1fa98b0c, 0x1149382c,
0xe97625a5, 0x0614d1b7, 0x0e25244b, 0x0c768347, 0x589e8d82, 0x0d2059d1, 0xa466bb1e, 0xf8da0a82,
0x04f19130, 0xba6e4ec0, 0x99265164, 0x1ee7230d, 0x50b2ad80, 0xeaee6801, 0x8db2a283, 0xea8bf59e 
			};

    //====================================
    // Useful constants
    //====================================

    protected static final int    MAX_ROUNDS = 16;
    protected static final int    RED_ROUNDS = 12;

    protected static final int    BLOCK_SIZE = 8;  // bytes = 64 bits

	protected int _Kr[] = new int[17];		// the rotating round key
	protected int _Km[] = new int[17];		// the masking round key

    private boolean isInit = false;
    private boolean _encrypting = false;

    private byte[] 	_workingKey = null;
	private int		_rounds = MAX_ROUNDS;

    public CAST5Engine()
    {
    }

    /**
     * initialise a CAST cipher.
     *
     * @param forEncryption whether or not we are for encryption.
     * @param params the parameters required to set up the cipher.
     * @exception IllegalArgumentException if the params argument is
     * inappropriate.
     */
    public void init(
        boolean             encrypting,
        CipherParameters    params)
    {
        if (params instanceof KeyParameter)
        {
            _encrypting = encrypting;
            _workingKey = ((KeyParameter)params).getKey();

            setKey(_workingKey);

            return;
        }

        throw new IllegalArgumentException("Invalid parameter passed to "+getAlgorithmName()+" init - " + params.getClass().getName());
    }

    public String getAlgorithmName()
    {
        return "CAST5";
    }

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

        if ((inOff + BLOCK_SIZE) > in.length)
        {
            throw new DataLengthException("Input buffer too short");
        }

        if ((outOff + BLOCK_SIZE) > out.length)
        {
            throw new DataLengthException("Output buffer too short");
        }

        if (_encrypting)
        {
            return encryptBlock(in, inOff, out, outOff);
        }
        else
        {    
            return decryptBlock(in, inOff, out, outOff);
        }
    }

    public void reset()
    {
    }

    public int getBlockSize()
    {
        return BLOCK_SIZE;
    }

    //==================================
    // Private Implementation
    //==================================

	/*
	 * Creates the subkeys using the same nomenclature
	 * as described in RFC2144.
	 *
	 * See section 2.4
	 */
    protected void setKey(byte[] key)
    {
		/* 
		 * Determine the key size here, if required
		 *
		 * if keysize <= 80bits, use 12 rounds instead of 16
		 * if keysize < 128bits, pad with 0
		 *
		 * Typical key sizes => 40, 64, 80, 128
		 */

		if (key.length < 11)
		{
			_rounds = RED_ROUNDS;
		}

		int z[] = new int[16];
		int x[] = new int[16];

		int z03, z47, z8B, zCF;
		int x03, x47, x8B, xCF;

		/* copy the key into x */
		for (int i=0; i< key.length; i++) 
		{ 
			x[i] = (int)(key[i] & 0xff); 
		}

		/*
		 * This will look different because the selection of
		 * bytes from the input key I've already chosen the
		 * correct int.
		 */
		x03 = IntsTo32bits(x, 0x0);
		x47 = IntsTo32bits(x, 0x4);
		x8B = IntsTo32bits(x, 0x8);
		xCF = IntsTo32bits(x, 0xC);

		z03 = x03 ^S5[x[0xD]] ^S6[x[0xF]] ^S7[x[0xC]] ^S8[x[0xE]] ^S7[x[0x8]];

		Bits32ToInts(z03, z, 0x0);
		z47 = x8B ^S5[z[0x0]] ^S6[z[0x2]] ^S7[z[0x1]] ^S8[z[0x3]] ^S8[x[0xA]];
		Bits32ToInts(z47, z, 0x4);
		z8B = xCF ^S5[z[0x7]] ^S6[z[0x6]] ^S7[z[0x5]] ^S8[z[0x4]] ^S5[x[0x9]];
		Bits32ToInts(z8B, z, 0x8);
		zCF = x47 ^S5[z[0xA]] ^S6[z[0x9]] ^S7[z[0xB]] ^S8[z[0x8]] ^S6[x[0xB]];
		Bits32ToInts(zCF, z, 0xC);
		_Km[ 1]= S5[z[0x8]] ^ S6[z[0x9]] ^ S7[z[0x7]] ^ S8[z[0x6]] ^ S5[z[0x2]];
		_Km[ 2]= S5[z[0xA]] ^ S6[z[0xB]] ^ S7[z[0x5]] ^ S8[z[0x4]] ^ S6[z[0x6]];
		_Km[ 3]= S5[z[0xC]] ^ S6[z[0xD]] ^ S7[z[0x3]] ^ S8[z[0x2]] ^ S7[z[0x9]];
		_Km[ 4]= S5[z[0xE]] ^ S6[z[0xF]] ^ S7[z[0x1]] ^ S8[z[0x0]] ^ S8[z[0xC]];

		z03 = IntsTo32bits(z, 0x0);
		z47 = IntsTo32bits(z, 0x4);
		z8B = IntsTo32bits(z, 0x8);
		zCF = IntsTo32bits(z, 0xC);
		x03 = z8B ^S5[z[0x5]] ^S6[z[0x7]] ^S7[z[0x4]] ^S8[z[0x6]] ^S7[z[0x0]];
		Bits32ToInts(x03, x, 0x0);
		x47 = z03 ^S5[x[0x0]] ^S6[x[0x2]] ^S7[x[0x1]] ^S8[x[0x3]] ^S8[z[0x2]];
		Bits32ToInts(x47, x, 0x4);
		x8B = z47 ^S5[x[0x7]] ^S6[x[0x6]] ^S7[x[0x5]] ^S8[x[0x4]] ^S5[z[0x1]];
		Bits32ToInts(x8B, x, 0x8);
		xCF = zCF ^S5[x[0xA]] ^S6[x[0x9]] ^S7[x[0xB]] ^S8[x[0x8]] ^S6[z[0x3]];
		Bits32ToInts(xCF, x, 0xC);
		_Km[ 5]= S5[x[0x3]] ^ S6[x[0x2]] ^ S7[x[0xC]] ^ S8[x[0xD]] ^ S5[x[0x8]];
		_Km[ 6]= S5[x[0x1]] ^ S6[x[0x0]] ^ S7[x[0xE]] ^ S8[x[0xF]] ^ S6[x[0xD]];
		_Km[ 7]= S5[x[0x7]] ^ S6[x[0x6]] ^ S7[x[0x8]] ^ S8[x[0x9]] ^ S7[x[0x3]];
		_Km[ 8]= S5[x[0x5]] ^ S6[x[0x4]] ^ S7[x[0xA]] ^ S8[x[0xB]] ^ S8[x[0x7]];

		x03 = IntsTo32bits(x, 0x0);
		x47 = IntsTo32bits(x, 0x4);
		x8B = IntsTo32bits(x, 0x8);
		xCF = IntsTo32bits(x, 0xC);
		z03 = x03 ^S5[x[0xD]] ^S6[x[0xF]] ^S7[x[0xC]] ^S8[x[0xE]] ^S7[x[0x8]];
		Bits32ToInts(z03, z, 0x0);
		z47 = x8B ^S5[z[0x0]] ^S6[z[0x2]] ^S7[z[0x1]] ^S8[z[0x3]] ^S8[x[0xA]];
		Bits32ToInts(z47, z, 0x4);
		z8B = xCF ^S5[z[0x7]] ^S6[z[0x6]] ^S7[z[0x5]] ^S8[z[0x4]] ^S5[x[0x9]];
		Bits32ToInts(z8B, z, 0x8);
		zCF = x47 ^S5[z[0xA]] ^S6[z[0x9]] ^S7[z[0xB]] ^S8[z[0x8]] ^S6[x[0xB]];
		Bits32ToInts(zCF, z, 0xC);
		_Km[ 9]= S5[z[0x3]] ^ S6[z[0x2]] ^ S7[z[0xC]] ^ S8[z[0xD]] ^ S5[z[0x9]];
		_Km[10]= S5[z[0x1]] ^ S6[z[0x0]] ^ S7[z[0xE]] ^ S8[z[0xF]] ^ S6[z[0xc]];
		_Km[11]= S5[z[0x7]] ^ S6[z[0x6]] ^ S7[z[0x8]] ^ S8[z[0x9]] ^ S7[z[0x2]];
		_Km[12]= S5[z[0x5]] ^ S6[z[0x4]] ^ S7[z[0xA]] ^ S8[z[0xB]] ^ S8[z[0x6]];

		z03 = IntsTo32bits(z, 0x0);
		z47 = IntsTo32bits(z, 0x4);
		z8B = IntsTo32bits(z, 0x8);
		zCF = IntsTo32bits(z, 0xC);
		x03 = z8B ^S5[z[0x5]] ^S6[z[0x7]] ^S7[z[0x4]] ^S8[z[0x6]] ^S7[z[0x0]];
		Bits32ToInts(x03, x, 0x0);
		x47 = z03 ^S5[x[0x0]] ^S6[x[0x2]] ^S7[x[0x1]] ^S8[x[0x3]] ^S8[z[0x2]];
		Bits32ToInts(x47, x, 0x4);
		x8B = z47 ^S5[x[0x7]] ^S6[x[0x6]] ^S7[x[0x5]] ^S8[x[0x4]] ^S5[z[0x1]];
		Bits32ToInts(x8B, x, 0x8);
		xCF = zCF ^S5[x[0xA]] ^S6[x[0x9]] ^S7[x[0xB]] ^S8[x[0x8]] ^S6[z[0x3]];
		Bits32ToInts(xCF, x, 0xC);
		_Km[13]= S5[x[0x8]] ^ S6[x[0x9]] ^ S7[x[0x7]] ^ S8[x[0x6]] ^ S5[x[0x3]];
		_Km[14]= S5[x[0xA]] ^ S6[x[0xB]] ^ S7[x[0x5]] ^ S8[x[0x4]] ^ S6[x[0x7]];
		_Km[15]= S5[x[0xC]] ^ S6[x[0xD]] ^ S7[x[0x3]] ^ S8[x[0x2]] ^ S7[x[0x8]];
		_Km[16]= S5[x[0xE]] ^ S6[x[0xF]] ^ S7[x[0x1]] ^ S8[x[0x0]] ^ S8[x[0xD]];

		x03 = IntsTo32bits(x, 0x0);
		x47 = IntsTo32bits(x, 0x4);
		x8B = IntsTo32bits(x, 0x8);
		xCF = IntsTo32bits(x, 0xC);
		z03 = x03 ^S5[x[0xD]] ^S6[x[0xF]] ^S7[x[0xC]] ^S8[x[0xE]] ^S7[x[0x8]];
		Bits32ToInts(z03, z, 0x0);
		z47 = x8B ^S5[z[0x0]] ^S6[z[0x2]] ^S7[z[0x1]] ^S8[z[0x3]] ^S8[x[0xA]];
		Bits32ToInts(z47, z, 0x4);
		z8B = xCF ^S5[z[0x7]] ^S6[z[0x6]] ^S7[z[0x5]] ^S8[z[0x4]] ^S5[x[0x9]];
		Bits32ToInts(z8B, z, 0x8);
		zCF = x47 ^S5[z[0xA]] ^S6[z[0x9]] ^S7[z[0xB]] ^S8[z[0x8]] ^S6[x[0xB]];
		Bits32ToInts(zCF, z, 0xC);
		_Kr[ 1]=(S5[z[0x8]]^S6[z[0x9]]^S7[z[0x7]]^S8[z[0x6]] ^ S5[z[0x2]])&0x1f;
		_Kr[ 2]=(S5[z[0xA]]^S6[z[0xB]]^S7[z[0x5]]^S8[z[0x4]] ^ S6[z[0x6]])&0x1f;
		_Kr[ 3]=(S5[z[0xC]]^S6[z[0xD]]^S7[z[0x3]]^S8[z[0x2]] ^ S7[z[0x9]])&0x1f;
		_Kr[ 4]=(S5[z[0xE]]^S6[z[0xF]]^S7[z[0x1]]^S8[z[0x0]] ^ S8[z[0xC]])&0x1f;

		z03 = IntsTo32bits(z, 0x0);
		z47 = IntsTo32bits(z, 0x4);
		z8B = IntsTo32bits(z, 0x8);
		zCF = IntsTo32bits(z, 0xC);
		x03 = z8B ^S5[z[0x5]] ^S6[z[0x7]] ^S7[z[0x4]] ^S8[z[0x6]] ^S7[z[0x0]];
		Bits32ToInts(x03, x, 0x0);
		x47 = z03 ^S5[x[0x0]] ^S6[x[0x2]] ^S7[x[0x1]] ^S8[x[0x3]] ^S8[z[0x2]];
		Bits32ToInts(x47, x, 0x4);
		x8B = z47 ^S5[x[0x7]] ^S6[x[0x6]] ^S7[x[0x5]] ^S8[x[0x4]] ^S5[z[0x1]];
		Bits32ToInts(x8B, x, 0x8);
		xCF = zCF ^S5[x[0xA]] ^S6[x[0x9]] ^S7[x[0xB]] ^S8[x[0x8]] ^S6[z[0x3]];
		Bits32ToInts(xCF, x, 0xC);
		_Kr[ 5]=(S5[x[0x3]]^S6[x[0x2]]^S7[x[0xC]]^S8[x[0xD]]^S5[x[0x8]])&0x1f;
		_Kr[ 6]=(S5[x[0x1]]^S6[x[0x0]]^S7[x[0xE]]^S8[x[0xF]]^S6[x[0xD]])&0x1f;
		_Kr[ 7]=(S5[x[0x7]]^S6[x[0x6]]^S7[x[0x8]]^S8[x[0x9]]^S7[x[0x3]])&0x1f;
		_Kr[ 8]=(S5[x[0x5]]^S6[x[0x4]]^S7[x[0xA]]^S8[x[0xB]]^S8[x[0x7]])&0x1f;

		x03 = IntsTo32bits(x, 0x0);
		x47 = IntsTo32bits(x, 0x4);
		x8B = IntsTo32bits(x, 0x8);
		xCF = IntsTo32bits(x, 0xC);
		z03 = x03 ^S5[x[0xD]] ^S6[x[0xF]] ^S7[x[0xC]] ^S8[x[0xE]] ^S7[x[0x8]];
		Bits32ToInts(z03, z, 0x0);
		z47 = x8B ^S5[z[0x0]] ^S6[z[0x2]] ^S7[z[0x1]] ^S8[z[0x3]] ^S8[x[0xA]];
		Bits32ToInts(z47, z, 0x4);
		z8B = xCF ^S5[z[0x7]] ^S6[z[0x6]] ^S7[z[0x5]] ^S8[z[0x4]] ^S5[x[0x9]];
		Bits32ToInts(z8B, z, 0x8);
		zCF = x47 ^S5[z[0xA]] ^S6[z[0x9]] ^S7[z[0xB]] ^S8[z[0x8]] ^S6[x[0xB]];
		Bits32ToInts(zCF, z, 0xC);
		_Kr[ 9]=(S5[z[0x3]]^S6[z[0x2]]^S7[z[0xC]]^S8[z[0xD]]^S5[z[0x9]])&0x1f;
		_Kr[10]=(S5[z[0x1]]^S6[z[0x0]]^S7[z[0xE]]^S8[z[0xF]]^S6[z[0xc]])&0x1f;
		_Kr[11]=(S5[z[0x7]]^S6[z[0x6]]^S7[z[0x8]]^S8[z[0x9]]^S7[z[0x2]])&0x1f;
		_Kr[12]=(S5[z[0x5]]^S6[z[0x4]]^S7[z[0xA]]^S8[z[0xB]]^S8[z[0x6]])&0x1f;

		z03 = IntsTo32bits(z, 0x0);