package com.enterprisej2me.HttpConnections;/** * implementation of MD5 as outlined in  * "Handbook of Applied Cryptography", pages 346 - 347. * * Adopted from Bouncy Castle v1.16 */public class MD5Digest extends GeneralDigest{    private static final int    DIGEST_LENGTH = 16;    private int     H1, H2, H3, H4;         // IV's    private int[]   X = new int[16];    private int     xOff;	/**	 * Standard constructor	 */    public MD5Digest()    {        reset();    }	/**	 * Copy constructor.  This will copy the state of the provided	 * message digest.	 */	public MD5Digest(MD5Digest t)	{		super(t);		H1 = t.H1;		H2 = t.H2;		H3 = t.H3;		H4 = t.H4;		System.arraycopy(t.X, 0, X, 0, t.X.length);		xOff = t.xOff;	}    public String getAlgorithmName()    {        return "MD5";    }    public int getDigestSize()    {        return DIGEST_LENGTH;    }    protected void processWord(        byte[]  in,        int     inOff)    {        X[xOff++] = (in[inOff] & 0xff) | ((in[inOff + 1] & 0xff) << 8)            | ((in[inOff + 2] & 0xff) << 16) | ((in[inOff + 3] & 0xff) << 24);         if (xOff == 16)        {            processBlock();        }    }    protected void processLength(        long    bitLength)    {        if (xOff > 14)        {            processBlock();        }        X[14] = (int)(bitLength & 0xffffffff);        X[15] = (int)(bitLength >>> 32);    }    private void unpackWord(        int     word,        byte[]  out,        int     outOff)    {        out[outOff]     = (byte)word;        out[outOff + 1] = (byte)(word >>> 8);        out[outOff + 2] = (byte)(word >>> 16);        out[outOff + 3] = (byte)(word >>> 24);    }    public int doFinal(        byte[]  out,        int     outOff)    {        finish();        unpackWord(H1, out, outOff);        unpackWord(H2, out, outOff + 4);        unpackWord(H3, out, outOff + 8);        unpackWord(H4, out, outOff + 12);        reset();        return DIGEST_LENGTH;    }    /**     * reset the chaining variables to the IV values.     */    public void reset()    {        super.reset();        H1 = 0x67452301;        H2 = 0xefcdab89;        H3 = 0x98badcfe;        H4 = 0x10325476;        xOff = 0;        for (int i = 0; i != X.length; i++)        {            X[i] = 0;        }    }    //    // round 1 left rotates    //    private static final int S11 = 7;    private static final int S12 = 12;    private static final int S13 = 17;    private static final int S14 = 22;    //    // round 2 left rotates    //    private static final int S21 = 5;    private static final int S22 = 9;    private static final int S23 = 14;    private static final int S24 = 20;    //    // round 3 left rotates    //    private static final int S31 = 4;    private static final int S32 = 11;    private static final int S33 = 16;    private static final int S34 = 23;    //    // round 4 left rotates    //    private static final int S41 = 6;    private static final int S42 = 10;    private static final int S43 = 15;    private static final int S44 = 21;    /*     * rotate int x left n bits.     */    private int rotateLeft(        int x,        int n)    {        return (x << n) | (x >>> (32 - n));    }    /*     * F, G, H and I are the basic MD5 functions.     */    private int F(        int u,        int v,        int w)    {        return (u & v) | (~u & w);    }    private int G(        int u,        int v,        int w)    {        return (u & w) | (v & ~w);    }    private int H(        int u,        int v,        int w)    {        return u ^ v ^ w;    }    private int K(        int u,        int v,        int w)    {        return v ^ (u | ~w);    }    protected void processBlock()    {        int a = H1;        int b = H2;        int c = H3;        int d = H4;        //        // Round 1 - F cycle, 16 times.        //        a = rotateLeft((a + F(b, c, d) + X[ 0] + 0xd76aa478), S11) + b;        d = rotateLeft((d + F(a, b, c) + X[ 1] + 0xe8c7b756), S12) + a;        c = rotateLeft((c + F(d, a, b) + X[ 2] + 0x242070db), S13) + d;        b = rotateLeft((b + F(c, d, a) + X[ 3] + 0xc1bdceee), S14) + c;        a = rotateLeft((a + F(b, c, d) + X[ 4] + 0xf57c0faf), S11) + b;        d = rotateLeft((d + F(a, b, c) + X[ 5] + 0x4787c62a), S12) + a;        c = rotateLeft((c + F(d, a, b) + X[ 6] + 0xa8304613), S13) + d;        b = rotateLeft((b + F(c, d, a) + X[ 7] + 0xfd469501), S14) + c;        a = rotateLeft((a + F(b, c, d) + X[ 8] + 0x698098d8), S11) + b;        d = rotateLeft((d + F(a, b, c) + X[ 9] + 0x8b44f7af), S12) + a;        c = rotateLeft((c + F(d, a, b) + X[10] + 0xffff5bb1), S13) + d;        b = rotateLeft((b + F(c, d, a) + X[11] + 0x895cd7be), S14) + c;        a = rotateLeft((a + F(b, c, d) + X[12] + 0x6b901122), S11) + b;        d = rotateLeft((d + F(a, b, c) + X[13] + 0xfd987193), S12) + a;        c = rotateLeft((c + F(d, a, b) + X[14] + 0xa679438e), S13) + d;        b = rotateLeft((b + F(c, d, a) + X[15] + 0x49b40821), S14) + c;        //        // Round 2 - G cycle, 16 times.        //        a = rotateLeft((a + G(b, c, d) + X[ 1] + 0xf61e2562), S21) + b;        d = rotateLeft((d + G(a, b, c) + X[ 6] + 0xc040b340), S22) + a;        c = rotateLeft((c + G(d, a, b) + X[11] + 0x265e5a51), S23) + d;        b = rotateLeft((b + G(c, d, a) + X[ 0] + 0xe9b6c7aa), S24) + c;        a = rotateLeft((a + G(b, c, d) + X[ 5] + 0xd62f105d), S21) + b;        d = rotateLeft((d + G(a, b, c) + X[10] + 0x02441453), S22) + a;        c = rotateLeft((c + G(d, a, b) + X[15] + 0xd8a1e681), S23) + d;        b = rotateLeft((b + G(c, d, a) + X[ 4] + 0xe7d3fbc8), S24) + c;        a = rotateLeft((a + G(b, c, d) + X[ 9] + 0x21e1cde6), S21) + b;        d = rotateLeft((d + G(a, b, c) + X[14] + 0xc33707d6), S22) + a;        c = rotateLeft((c + G(d, a, b) + X[ 3] + 0xf4d50d87), S23) + d;        b = rotateLeft((b + G(c, d, a) + X[ 8] + 0x455a14ed), S24) + c;        a = rotateLeft((a + G(b, c, d) + X[13] + 0xa9e3e905), S21) + b;        d = rotateLeft((d + G(a, b, c) + X[ 2] + 0xfcefa3f8), S22) + a;        c = rotateLeft((c + G(d, a, b) + X[ 7] + 0x676f02d9), S23) + d;        b = rotateLeft((b + G(c, d, a) + X[12] + 0x8d2a4c8a), S24) + c;        //        // Round 3 - H cycle, 16 times.        //        a = rotateLeft((a + H(b, c, d) + X[ 5] + 0xfffa3942), S31) + b;        d = rotateLeft((d + H(a, b, c) + X[ 8] + 0x8771f681), S32) + a;        c = rotateLeft((c + H(d, a, b) + X[11] + 0x6d9d6122), S33) + d;        b = rotateLeft((b + H(c, d, a) + X[14] + 0xfde5380c), S34) + c;        a = rotateLeft((a + H(b, c, d) + X[ 1] + 0xa4beea44), S31) + b;        d = rotateLeft((d + H(a, b, c) + X[ 4] + 0x4bdecfa9), S32) + a;        c = rotateLeft((c + H(d, a, b) + X[ 7] + 0xf6bb4b60), S33) + d;        b = rotateLeft((b + H(c, d, a) + X[10] + 0xbebfbc70), S34) + c;        a = rotateLeft((a + H(b, c, d) + X[13] + 0x289b7ec6), S31) + b;        d = rotateLeft((d + H(a, b, c) + X[ 0] + 0xeaa127fa), S32) + a;        c = rotateLeft((c + H(d, a, b) + X[ 3] + 0xd4ef3085), S33) + d;        b = rotateLeft((b + H(c, d, a) + X[ 6] + 0x04881d05), S34) + c;        a = rotateLeft((a + H(b, c, d) + X[ 9] + 0xd9d4d039), S31) + b;        d = rotateLeft((d + H(a, b, c) + X[12] + 0xe6db99e5), S32) + a;        c = rotateLeft((c + H(d, a, b) + X[15] + 0x1fa27cf8), S33) + d;        b = rotateLeft((b + H(c, d, a) + X[ 2] + 0xc4ac5665), S34) + c;        //        // Round 4 - K cycle, 16 times.        //        a = rotateLeft((a + K(b, c, d) + X[ 0] + 0xf4292244), S41) + b;        d = rotateLeft((d + K(a, b, c) + X[ 7] + 0x432aff97), S42) + a;        c = rotateLeft((c + K(d, a, b) + X[14] + 0xab9423a7), S43) + d;        b = rotateLeft((b + K(c, d, a) + X[ 5] + 0xfc93a039), S44) + c;        a = rotateLeft((a + K(b, c, d) + X[12] + 0x655b59c3), S41) + b;        d = rotateLeft((d + K(a, b, c) + X[ 3] + 0x8f0ccc92), S42) + a;        c = rotateLeft((c + K(d, a, b) + X[10] + 0xffeff47d), S43) + d;        b = rotateLeft((b + K(c, d, a) + X[ 1] + 0x85845dd1), S44) + c;        a = rotateLeft((a + K(b, c, d) + X[ 8] + 0x6fa87e4f), S41) + b;        d = rotateLeft((d + K(a, b, c) + X[15] + 0xfe2ce6e0), S42) + a;        c = rotateLeft((c + K(d, a, b) + X[ 6] + 0xa3014314), S43) + d;        b = rotateLeft((b + K(c, d, a) + X[13] + 0x4e0811a1), S44) + c;        a = rotateLeft((a + K(b, c, d) + X[ 4] + 0xf7537e82), S41) + b;        d = rotateLeft((d + K(a, b, c) + X[11] + 0xbd3af235), S42) + a;        c = rotateLeft((c + K(d, a, b) + X[ 2] + 0x2ad7d2bb), S43) + d;        b = rotateLeft((b + K(c, d, a) + X[ 9] + 0xeb86d391), S44) + c;        H1 += a;        H2 += b;        H3 += c;        H4 += d;        //        // reset the offset and clean out the word buffer.        //        xOff = 0;        for (int i = 0; i != X.length; i++)        {            X[i] = 0;        }    }}