package com.ntsky.note;/** * <p>Title: NTsky新聞發布v1.0正式版</p> * <p>Description: 數據加密</p> * <p>Copyright: Copyright (c) 2003</p> * <p>Company: NTsky</p> * @authory 姚君林 * @version 1.0 */public class MD5 {        /* 下面這些S11-S44實際上是一個4*4的矩陣，在原始的C實現中是用#define 實現的，        這里把它們實現成為static final是表示了只讀，切能在同一個進程空間內的多個        Instance間共享*/        static final int S11 = 7;        static final int S12 = 12;        static final int S13 = 17;        static final int S14 = 22;        static final int S21 = 5;        static final int S22 = 9;        static final int S23 = 14;        static final int S24 = 20;        static final int S31 = 4;        static final int S32 = 11;        static final int S33 = 16;        static final int S34 = 23;        static final int S41 = 6;        static final int S42 = 10;        static final int S43 = 15;        static final int S44 = 21;        static final byte[] PADDING = { -128, 0, 0, 0, 0, 0, 0, 0, 0,        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };        /* 下面的三個成員是MD5計算過程中用到的3個核心數據，在原始的C實現中           被定義到MD5_CTX結構中         */        private long[] state = new long[4];  // state (ABCD)        private long[] count = new long[2];  // number of bits, modulo 2^64 (lsb first)        private byte[] buffer = new byte[64]; // input buffer        /* digestHexStr是MD5的唯一一個公共成員，是最新一次計算結果的        　 16進制ASCII表示.        */        public String digestHexStr;        /* digest,是最新一次計算結果的2進制內部表示，表示128bit的MD5值.        */        private byte[] digest = new byte[16];        /*          getMD5ofStr是類MD5最主要的公共方法，入口參數是你想要進行MD5變換的字符串          返回的是變換完的結果，這個結果是從公共成員digestHexStr取得的．        */        public String getMD5ofStr(String inbuf) {                md5Init();                md5Update(inbuf.getBytes(), inbuf.length());                md5Final();                digestHexStr = "";                for (int i = 0; i < 16; i++) {                        digestHexStr += byteHEX(digest[i]);                }                return digestHexStr;        }        // 這是MD5這個類的標準構造函數，JavaBean要求有一個public的并且沒有參數的構造函數        public MD5() {                md5Init();                return;        }        /* md5Init是一個初始化函數，初始化核心變量，裝入標準的幻數 */        private void md5Init() {                count[0] = 0L;                count[1] = 0L;                ///* Load magic initialization constants.                state[0] = 0x67452301L;                state[1] = 0xefcdab89L;                state[2] = 0x98badcfeL;                state[3] = 0x10325476L;                return;        }        /* F, G, H ,I 是4個基本的MD5函數，在原始的MD5的C實現中，由于它們是        簡單的位運算，可能出于效率的考慮把它們實現成了宏，在java中，我們把它們     　　實現成了private方法，名字保持了原來C中的。 */        private long F(long x, long y, long z) {                return (x & y) | ((~x) & z);        }        private long G(long x, long y, long z) {                return (x & z) | (y & (~z));        }        private long H(long x, long y, long z) {                return x ^ y ^ z;        }        private long I(long x, long y, long z) {                return y ^ (x | (~z));        }       /*          FF,GG,HH和II將調用F,G,H,I進行近一步變換          FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.          Rotation is separate from addition to prevent recomputation.       */        private long FF(long a, long b, long c, long d, long x, long s,                long ac) {                a += F (b, c, d) + x + ac;                a = ((int) a << s) | ((int) a >>> (32 - s));                a += b;                return a;        }        private long GG(long a, long b, long c, long d, long x, long s,                long ac) {                a += G (b, c, d) + x + ac;                a = ((int) a << s) | ((int) a >>> (32 - s));                a += b;                return a;        }        private long HH(long a, long b, long c, long d, long x, long s,                long ac) {                a += H (b, c, d) + x + ac;                a = ((int) a << s) | ((int) a >>> (32 - s));                a += b;                return a;        }        private long II(long a, long b, long c, long d, long x, long s,                long ac) {                a += I (b, c, d) + x + ac;                a = ((int) a << s) | ((int) a >>> (32 - s));                a += b;                return a;        }        /*         md5Update是MD5的主計算過程，inbuf是要變換的字節串，inputlen是長度，這個         函數由getMD5ofStr調用，調用之前需要調用md5init，因此把它設計成private的        */        private void md5Update(byte[] inbuf, int inputLen) {                int i, index, partLen;                byte[] block = new byte[64];                index = (int)(count[0] >>> 3) & 0x3F;                // /* Update number of bits */                if ((count[0] += (inputLen << 3)) < (inputLen << 3))                        count[1]++;                count[1] += (inputLen >>> 29);                partLen = 64 - index;                // Transform as many times as possible.                if (inputLen >= partLen) {                        md5Memcpy(buffer, inbuf, index, 0, partLen);                        md5Transform(buffer);                        for (i = partLen; i + 63 < inputLen; i += 64) {                                md5Memcpy(block, inbuf, 0, i, 64);                                md5Transform (block);                        }                        index = 0;                } else                        i = 0;                ///* Buffer remaining input */                md5Memcpy(buffer, inbuf, index, i, inputLen - i);        }        /*          md5Final整理和填寫輸出結果        */        private void md5Final () {                byte[] bits = new byte[8];                int index, padLen;                ///* Save number of bits */                Encode (bits, count, 8);                ///* Pad out to 56 mod 64.                index = (int)(count[0] >>> 3) & 0x3f;                padLen = (index < 56) ? (56 - index) : (120 - index);                md5Update (PADDING, padLen);                ///* Append length (before padding) */                md5Update(bits, 8);                ///* Store state in digest */                Encode (digest, state, 16);        }        /* md5Memcpy是一個內部使用的byte數組的塊拷貝函數，從input的inpos開始把len長度的　　　　　 字節拷貝到output的outpos位置開始        */        private void md5Memcpy (byte[] output, byte[] input,                int outpos, int inpos, int len)        {                int i;                for (i = 0; i < len; i++)                        output[outpos + i] = input[inpos + i];        }        /*           md5Transform是MD5核心變換程序，有md5Update調用，block是分塊的原始字節        */        private void md5Transform (byte block[]) {                long a = state[0], b = state[1], c = state[2], d = state[3];                long[] x = new long[16];                Decode (x, block, 64);                /* Round 1 */                a = FF (a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */                d = FF (d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */                c = FF (c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */                b = FF (b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */                a = FF (a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */                d = FF (d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */                c = FF (c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */                b = FF (b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */                a = FF (a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */                d = FF (d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */                c = FF (c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */                b = FF (b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */                a = FF (a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */                d = FF (d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */                c = FF (c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */                b = FF (b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */                /* Round 2 */                a = GG (a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */                d = GG (d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */                c = GG (c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */                b = GG (b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */                a = GG (a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */                d = GG (d, a, b, c, x[10], S22, 0x2441453L); /* 22 */                c = GG (c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */                b = GG (b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */                a = GG (a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */                d = GG (d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */                c = GG (c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */                b = GG (b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */                a = GG (a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */                d = GG (d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */                c = GG (c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */                b = GG (b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */                /* Round 3 */                a = HH (a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */                d = HH (d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */                c = HH (c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */                b = HH (b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */                a = HH (a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */                d = HH (d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */                c = HH (c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */                b = HH (b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */                a = HH (a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */                d = HH (d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */                c = HH (c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */                b = HH (b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */                a = HH (a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */                d = HH (d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */                c = HH (c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */                b = HH (b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */                /* Round 4 */                a = II (a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */                d = II (d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */                c = II (c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */                b = II (b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */                a = II (a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */                d = II (d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */                c = II (c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */                b = II (b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */                a = II (a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */                d = II (d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */                c = II (c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */                b = II (b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */                a = II (a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */                d = II (d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */                c = II (c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */                b = II (b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */                state[0] += a;                state[1] += b;                state[2] += c;                state[3] += d;        }        /*Encode把long數組按順序拆成byte數組，因為java的long類型是64bit的，          只拆低32bit，以適應原始C實現的用途        */        private void Encode (byte[] output, long[] input, int len) {                int i, j;                for (i = 0, j = 0; j < len; i++, j += 4) {                        output[j] = (byte)(input[i] & 0xffL);                        output[j + 1] = (byte)((input[i] >>> 8) & 0xffL);                        output[j + 2] = (byte)((input[i] >>> 16) & 0xffL);                        output[j + 3] = (byte)((input[i] >>> 24) & 0xffL);                }        }        /*Decode把byte數組按順序合成成long數組，因為java的long類型是64bit的，          只合成低32bit，高32bit清零，以適應原始C實現的用途        */        private void Decode (long[] output, byte[] input, int len) {                int i, j;                for (i = 0, j = 0; j < len; i++, j += 4)                        output[i] = b2iu(input[j]) |                                (b2iu(input[j + 1]) << 8) |                                (b2iu(input[j + 2]) << 16) |                                (b2iu(input[j + 3]) << 24);                return;        }        /*          b2iu是我寫的一個把byte按照不考慮正負號的原則的＂升位＂程序，因為java沒有unsigned運算        */        public static long b2iu(byte b) {                return b < 0 ? b & 0x7F + 128 : b;        }        /*byteHEX()，用來把一個byte類型的數轉換成十六進制的ASCII表示，        　因為java中的byte的toString無法實現這一點，我們又沒有C語言中的          sprintf(outbuf,"%02X",ib)        */        public static String byteHEX(byte ib) {                char[] Digit = { '0','1','2','3','4','5','6','7','8','9',                'A','B','C','D','E','F' };                char [] ob = new char[2];                ob[0] = Digit[(ib >>> 4) & 0X0F];                ob[1] = Digit[ib & 0X0F];                String s = new String(ob);                return s;        }        public static String toMD5(String source){                MD5 md5 = new MD5();                return md5.getMD5ofStr(source);        }}