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          MD5算法是將數(shù)據(jù)進(jìn)行不可逆加密的算法有較好的安全性,在國(guó)內(nèi)如壽信的安全支付平臺(tái)就采用此算法。
          源代碼如下
          /************************************************
          MD5 算法的Java Bean
          Last Modified:10,Mar,2001
          *************************************************/

          import java.lang.reflect.*;

          /*************************************************
          md5 類(lèi)實(shí)現(xiàn)了RSA Data Security, Inc.在提交給IETF
          的RFC1321中的MD5 message-digest 算法。
          *************************************************/

          public class MD5 {
          /* 下面這些S11-S44實(shí)際上是一個(gè)4*4的矩陣,在原始的C實(shí)現(xiàn)中是用#define 實(shí)現(xiàn)的,
          這里把它們實(shí)現(xiàn)成為static final是表示了只讀,切能在同一個(gè)進(jìn)程空間內(nèi)的多個(gè)
          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(gè)成員是MD5計(jì)算過(guò)程中用到的3個(gè)核心數(shù)據(jù),在原始的C實(shí)現(xiàn)中
          ???被定義到MD5_CTX結(jié)構(gòu)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(gè)公共成員,是最新一次計(jì)算結(jié)果的
            16進(jìn)制ASCII表示.
          */
          public String digestHexStr;

          /* digest,是最新一次計(jì)算結(jié)果的2進(jìn)制內(nèi)部表示,表示128bit的MD5值.
          */
          private byte[] digest = new byte[16];

          /*
          ??getMD5ofStr是類(lèi)MD5最主要的公共方法,入口參數(shù)是你想要進(jìn)行MD5變換的字符串
          ??返回的是變換完的結(jié)果,這個(gè)結(jié)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(gè)類(lèi)的標(biāo)準(zhǔn)構(gòu)造函數(shù),JavaBean要求有一個(gè)public的并且沒(méi)有參數(shù)的構(gòu)造函數(shù)
          public MD5() {
          md5Init();

          return;
          }



          /* md5Init是一個(gè)初始化函數(shù),初始化核心變量,裝入標(biāo)準(zhǔn)的幻數(shù) */
          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(gè)基本的MD5函數(shù),在原始的MD5的C實(shí)現(xiàn)中,由于它們是
          簡(jiǎn)單的位運(yùn)算,可能出于效率的考慮把它們實(shí)現(xiàn)成了宏,在java中,我們把它們
            實(shí)現(xiàn)成了private方法,名字保持了原來(lái)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(diào)用F,G,H,I進(jìn)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(jì)算過(guò)程,inbuf是要變換的字節(jié)串,inputlen是長(zhǎng)度,這個(gè)
          函數(shù)由getMD5ofStr調(diào)用,調(diào)用之前需要調(diào)用md5init,因此把它設(shè)計(jì)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(xiě)輸出結(jié)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(gè)內(nèi)部使用的byte數(shù)組的塊拷貝函數(shù),從input的inpos開(kāi)始把len長(zhǎng)度的
                字節(jié)拷貝到output的outpos位置開(kāi)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(diào)用,block是分塊的原始字節(jié)
          */
          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(shù)組按順序拆成byte數(shù)組,因?yàn)閖ava的long類(lèi)型是64bit的,
          ??只拆低32bit,以適應(yīng)原始C實(shí)現(xiàn)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(shù)組按順序合成成long數(shù)組,因?yàn)閖ava的long類(lèi)型是64bit的,
          ??只合成低32bit,高32bit清零,以適應(yīng)原始C實(shí)現(xiàn)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(xiě)的一個(gè)把byte按照不考慮正負(fù)號(hào)的原則的"升位"程序,因?yàn)閖ava沒(méi)有unsigned運(yùn)算
          */
          public static long b2iu(byte b) {
          return b < 0 ? b & 0x7F + 128 : b;
          }

          /*byteHEX(),用來(lái)把一個(gè)byte類(lèi)型的數(shù)轉(zhuǎn)換成十六進(jìn)制的ASCII表示,
           因?yàn)閖ava中的byte的toString無(wú)法實(shí)現(xiàn)這一點(diǎn),我們又沒(méi)有C語(yǔ)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;
          }
          }
          posted on 2006-09-28 14:09 圣域飛俠 閱讀(4727) 評(píng)論(2)  編輯  收藏

          FeedBack:
          # re: java的md5加密類(lèi)
          2006-09-29 08:41 | 祥子
          /**
          * Alipay.com Inc. Copyright (c) 2004-2005 All Rights Reserved.
          *
          * <p>
          * Created on 2005-7-9
          * </p>
          */

          import java.security.MessageDigest;
          import java.security.NoSuchAlgorithmException;

          /**
          * MD5加密算法
          */
          public class Md5Encrypt {
          /**
          * 對(duì)字符串進(jìn)行MD5加密
          *
          * @param text 明文
          *
          * @return 密文
          */
          public static String md5(String text) {
          MessageDigest msgDigest = null;

          try {
          msgDigest = MessageDigest.getInstance("MD5");
          } catch (NoSuchAlgorithmException e) {
          throw new IllegalStateException("System doesn't support MD5 algorithm.");
          }

          msgDigest.update(text.getBytes());

          byte[] bytes = msgDigest.digest();

          byte tb;
          char low;
          char high;
          char tmpChar;

          String md5Str = new String();

          for (int i = 0; i < bytes.length; i++) {
          tb = bytes[i];

          tmpChar = (char) ((tb >>> 4) & 0x000f);

          if (tmpChar >= 10) {
          high = (char) (('a' + tmpChar) - 10);
          } else {
          high = (char) ('0' + tmpChar);
          }

          md5Str += high;
          tmpChar = (char) (tb & 0x000f);

          if (tmpChar >= 10) {
          low = (char) (('a' + tmpChar) - 10);
          } else {
          low = (char) ('0' + tmpChar);
          }

          md5Str += low;
          }

          return md5Str;
          }
          }  回復(fù)  更多評(píng)論
            
          # re: java的md5加密類(lèi)
          2006-09-29 14:28 | 蠻哥♂楓
          現(xiàn)在國(guó)外都有一些網(wǎng)站可以來(lái)破MD5密碼啦,不過(guò),不是全部的都可以破,只不過(guò)比較常見(jiàn)的密碼都可以破的

          例:
          http://md5.rednoize.com/  回復(fù)  更多評(píng)論
            

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