md5 implement javascript

md5.js

  var MD5 = function (string) {
    function RotateLeft(lValue, iShiftBits) {
      return (lValue << iShiftBits) | (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) << lBytePosition);

        lByteCount++;
      }

      lWordCount = (lByteCount - (lByteCount % 4)) / 4;
      lBytePosition = (lByteCount % 4) * 8;
      lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);
      lWordArray[lNumberOfWords - 2] = lMessageLength << 3;
      lWordArray[lNumberOfWords - 1] = lMessageLength >>> 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 < x.length; k += 16) {
      AA = a;
      BB = b;
      CC = c;
      DD = d;

      a = FF(a, b, c, d, x[k + 0], S11, 0xd76aa478);
      d = FF(d, a, b, c, x[k + 1], S12, 0xe8c7b756);
      c = FF(c, d, a, b, x[k + 2], S13, 0x242070db);
      b = FF(b, c, d, a, x[k + 3], S14, 0xc1bdceee);
      a = FF(a, b, c, d, x[k + 4], S11, 0xf57c0faf);
      d = FF(d, a, b, c, x[k + 5], S12, 0x4787c62a);
      c = FF(c, d, a, b, x[k + 6], S13, 0xa8304613);
      b = FF(b, c, d, a, x[k + 7], S14, 0xfd469501);
      a = FF(a, b, c, d, x[k + 8], S11, 0x698098d8);
      d = FF(d, a, b, c, x[k + 9], S12, 0x8b44f7af);
      c = FF(c, d, a, b, x[k + 10], S13, 0xffff5bb1);
      b = FF(b, c, d, a, x[k + 11], S14, 0x895cd7be);
      a = FF(a, b, c, d, x[k + 12], S11, 0x6b901122);
      d = FF(d, a, b, c, x[k + 13], S12, 0xfd987193);
      c = FF(c, d, a, b, x[k + 14], S13, 0xa679438e);
      b = FF(b, c, d, a, x[k + 15], S14, 0x49b40821);
      a = GG(a, b, c, d, x[k + 1], S21, 0xf61e2562);
      d = GG(d, a, b, c, x[k + 6], S22, 0xc040b340);
      c = GG(c, d, a, b, x[k + 11], S23, 0x265e5a51);
      b = GG(b, c, d, a, x[k + 0], S24, 0xe9b6c7aa);
      a = GG(a, b, c, d, x[k + 5], S21, 0xd62f105d);
      d = GG(d, a, b, c, x[k + 10], S22, 0x2441453);
      c = GG(c, d, a, b, x[k + 15], S23, 0xd8a1e681);
      b = GG(b, c, d, a, x[k + 4], S24, 0xe7d3fbc8);
      a = GG(a, b, c, d, x[k + 9], S21, 0x21e1cde6);
      d = GG(d, a, b, c, x[k + 14], S22, 0xc33707d6);
      c = GG(c, d, a, b, x[k + 3], S23, 0xf4d50d87);
      b = GG(b, c, d, a, x[k + 8], S24, 0x455a14ed);
      a = GG(a, b, c, d, x[k + 13], S21, 0xa9e3e905);
      d = GG(d, a, b, c, x[k + 2], S22, 0xfcefa3f8);
      c = GG(c, d, a, b, x[k + 7], S23, 0x676f02d9);
      b = GG(b, c, d, a, x[k + 12], S24, 0x8d2a4c8a);
      a = HH(a, b, c, d, x[k + 5], S31, 0xfffa3942);
      d = HH(d, a, b, c, x[k + 8], S32, 0x8771f681);
      c = HH(c, d, a, b, x[k + 11], S33, 0x6d9d6122);
      b = HH(b, c, d, a, x[k + 14], S34, 0xfde5380c);
      a = HH(a, b, c, d, x[k + 1], S31, 0xa4beea44);
      d = HH(d, a, b, c, x[k + 4], S32, 0x4bdecfa9);
      c = HH(c, d, a, b, x[k + 7], S33, 0xf6bb4b60);
      b = HH(b, c, d, a, x[k + 10], S34, 0xbebfbc70);
      a = HH(a, b, c, d, x[k + 13], S31, 0x289b7ec6);
      d = HH(d, a, b, c, x[k + 0], S32, 0xeaa127fa);
      c = HH(c, d, a, b, x[k + 3], S33, 0xd4ef3085);
      b = HH(b, c, d, a, x[k + 6], S34, 0x4881d05);
      a = HH(a, b, c, d, x[k + 9], S31, 0xd9d4d039);
      d = HH(d, a, b, c, x[k + 12], S32, 0xe6db99e5);
      c = HH(c, d, a, b, x[k + 15], S33, 0x1fa27cf8);
      b = HH(b, c, d, a, x[k + 2], S34, 0xc4ac5665);
      a = II(a, b, c, d, x[k + 0], S41, 0xf4292244);
      d = II(d, a, b, c, x[k + 7], S42, 0x432aff97);
      c = II(c, d, a, b, x[k + 14], S43, 0xab9423a7);
      b = II(b, c, d, a, x[k + 5], S44, 0xfc93a039);
      a = II(a, b, c, d, x[k + 12], S41, 0x655b59c3);
      d = II(d, a, b, c, x[k + 3], S42, 0x8f0ccc92);
      c = II(c, d, a, b, x[k + 10], S43, 0xffeff47d);
      b = II(b, c, d, a, x[k + 1], S44, 0x85845dd1);
      a = II(a, b, c, d, x[k + 8], S41, 0x6fa87e4f);
      d = II(d, a, b, c, x[k + 15], S42, 0xfe2ce6e0);
      c = II(c, d, a, b, x[k + 6], S43, 0xa3014314);
      b = II(b, c, d, a, x[k + 13], S44, 0x4e0811a1);
      a = II(a, b, c, d, x[k + 4], S41, 0xf7537e82);
      d = II(d, a, b, c, x[k + 11], S42, 0xbd3af235);
      c = II(c, d, a, b, x[k + 2], S43, 0x2ad7d2bb);
      b = II(b, c, d, a, x[k + 9], S44, 0xeb86d391);
      a = AddUnsigned(a, AA);
      b = AddUnsigned(b, BB);
      c = AddUnsigned(c, CC);
      d = AddUnsigned(d, DD);
    }

    var temp = WordToHex(a) + WordToHex(b) + WordToHex(c) + WordToHex(d);

    return temp.toLowerCase();
  };