js-md5 - npm https://www.npmjs.com/package/js-md5

  var rotateLeft = function(lValue, iShiftBits) {

    return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));

  }

  var addUnsigned = function(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);

    }

  }

  var F = function(x, y, z) {

    return (x & y) | ((~x) & z);

  }

  var G = function(x, y, z) {

    return (x & z) | (y & (~z));

  }

  var H = function(x, y, z) {

    return (x ^ y ^ z);

  }

  var I = function(x, y, z) {

    return (y ^ (x | (~z)));

  }

  var FF = function(a, b, c, d, x, s, ac) {

    a = addUnsigned(a, addUnsigned(addUnsigned(F(b, c, d), x), ac));

    return addUnsigned(rotateLeft(a, s), b);

  };

  var GG = function(a, b, c, d, x, s, ac) {

    a = addUnsigned(a, addUnsigned(addUnsigned(G(b, c, d), x), ac));

    return addUnsigned(rotateLeft(a, s), b);

  };

  var HH = function(a, b, c, d, x, s, ac) {

    a = addUnsigned(a, addUnsigned(addUnsigned(H(b, c, d), x), ac));

    return addUnsigned(rotateLeft(a, s), b);

  };

  var II = function(a, b, c, d, x, s, ac) {

    a = addUnsigned(a, addUnsigned(addUnsigned(I(b, c, d), x), ac));

    return addUnsigned(rotateLeft(a, s), b);

  };

  var convertToWordArray = function(string) {

    var lWordCount;

    var lMessageLength = string.length;

    var lNumberOfWordsTempOne = lMessageLength + 8;

    var lNumberOfWordsTempTwo = (lNumberOfWordsTempOne - (lNumberOfWordsTempOne % 64)) / 64;

    var lNumberOfWords = (lNumberOfWordsTempTwo + 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;

  };

  var wordToHex = function(lValue) {

    var WordToHexValue = "",

      WordToHexValueTemp = "",

      lByte, lCount;

    for (lCount = 0; lCount <= 3; lCount++) {

      lByte = (lValue >>> (lCount * 8)) & 255;

      WordToHexValueTemp = "0" + lByte.toString(16);

      WordToHexValue = WordToHexValue + WordToHexValueTemp.substr(WordToHexValueTemp.length - 2, 2);

    }

    return WordToHexValue;

  };

  var uTF8Encode = function(string) {

    string = string.replace(/\x0d\x0a/g, "\x0a");

    var output = "";

    for (var n = 0; n < string.length; n++) {

      var c = string.charCodeAt(n);

      if (c < 128) {

        output += String.fromCharCode(c);

      } else if ((c > 127) && (c < 2048)) {

        output += String.fromCharCode((c >> 6) | 192);

        output += String.fromCharCode((c & 63) | 128);

      } else {

        output += String.fromCharCode((c >> 12) | 224);

        output += String.fromCharCode(((c >> 6) & 63) | 128);

        output += String.fromCharCode((c & 63) | 128);

      }

    }

    return output;

  };

  function md5(string) {

    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 tempValue = wordToHex(a) + wordToHex(b) + wordToHex(c) + wordToHex(d);

    return tempValue.toLowerCase();

  }

  //用于微信小程序

  module.exports = {

    md5: md5

  }

  // http://zixuephp.net/static/js/md5.js

  // 在线测试，用前端js实现MD5()加密 http://www.zixuephp.net/uploads/file/20171102/1509614764989508.html

　　

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