JavaScript实现的MD5算法完整实例

本文实例讲述了JavaScript实现MD5算法的方法。分享给大家供大家参考，具体如下：

/**
*
* MD5 (Message-Digest Algorithm)
* http://www.webtoolkit.info/
*
**/
var MD5 = function (string) {
 function RotateLeft(lValue, iShiftBits) {
  return (lValue<>>(32-iShiftBits));
 }
 function AddUnsigned(lX,lY) {
  var lX4,lY4,lX8,lY8,lResult;
  lX8 = (lX & 0x80000000);
  lY8 = (lY & 0x80000000);
  lX4 = (lX & 0x40000000);
  lY4 = (lY & 0x40000000);
  lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
  if (lX4 & lY4) {
   return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
  }
  if (lX4 | lY4) {
   if (lResult & 0x40000000) {
    return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
   } else {
    return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
   }
  } else {
   return (lResult ^ lX8 ^ lY8);
  }
  }
  function F(x,y,z) { return (x & y) | ((~x) & z); }
  function G(x,y,z) { return (x & z) | (y & (~z)); }
  function H(x,y,z) { return (x ^ y ^ z); }
 function I(x,y,z) { return (y ^ (x | (~z))); }
 function FF(a,b,c,d,x,s,ac) {
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
  return AddUnsigned(RotateLeft(a, s), b);
 };
 function GG(a,b,c,d,x,s,ac) {
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
  return AddUnsigned(RotateLeft(a, s), b);
 };
 function HH(a,b,c,d,x,s,ac) {
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
  return AddUnsigned(RotateLeft(a, s), b);
 };
 function II(a,b,c,d,x,s,ac) {
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
  return AddUnsigned(RotateLeft(a, s), b);
 };
 function ConvertToWordArray(string) {
  var lWordCount;
  var lMessageLength = string.length;
  var lNumberOfWords_temp1=lMessageLength + 8;
  var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
  var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
  var lWordArray=Array(lNumberOfWords-1);
  var lBytePosition = 0;
  var lByteCount = 0;
  while ( lByteCount < lMessageLength ) {
   lWordCount = (lByteCount-(lByteCount % 4))/4;
   lBytePosition = (lByteCount % 4)*8;
   lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount)<>>29;
  return lWordArray;
 };
 function WordToHex(lValue) {
  var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
  for (lCount = 0;lCount<=3;lCount++) {
   lByte = (lValue>>>(lCount*8)) & 255;
   WordToHexValue_temp = "0" + lByte.toString(16);
   WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
  }
  return WordToHexValue;
 };
 function Utf8Encode(string) {
  string = string.replace(/\r\n/g,"\n");
  var utftext = "";
  for (var n = 0; n < string.length; n++) {
   var c = string.charCodeAt(n);
   if (c < 128) {
    utftext += String.fromCharCode(c);
   }
   else if((c > 127) && (c < 2048)) {
    utftext += String.fromCharCode((c >> 6) | 192);
    utftext += String.fromCharCode((c & 63) | 128);
   }
   else {
    utftext += String.fromCharCode((c >> 12) | 224);
    utftext += String.fromCharCode(((c >> 6) & 63) | 128);
    utftext += String.fromCharCode((c & 63) | 128);
   }
  }
  return utftext;
 };
 var x=Array();
 var k,AA,BB,CC,DD,a,b,c,d;
 var S11=7, S12=12, S13=17, S14=22;
 var S21=5, S22=9 , S23=14, S24=20;
 var S31=4, S32=11, S33=16, S34=23;
 var S41=6, S42=10, S43=15, S44=21;
 string = Utf8Encode(string);
 x = ConvertToWordArray(string);
 a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
 for (k=0;k 
 

PS：这里再为大家提供2款MD5加密工具，需要的朋友可以参考一下：

MD5在线加密工具：

http://tools.jb51.net/password/CreateMD5Password

在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：

http://tools.jb51.net/password/hash_md5_sha

更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript数据结构与算法技巧总结》及《JavaScript数学运算用法总结》

希望本文所述对大家JavaScript程序设计有所帮助。