微信小程序Md5加密（utf-8汉字无影响）

微信小程序不让使用第三方jqMD5 只好改原生js咯

废话不多说直接贴代码 其实就是将原生function调用改为 module.exports = md5;

文中 红色标注

使用方法 将md5.js放到自己项目 lib文件夹中

var md5 = require('../lib/md5');

var res= md5("asadfasdfasdf");

//md5.js

 function md5(string) {
   function md5_RotateLeft(lValue, iShiftBits) {
     return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));
   }
   function md5_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 md5_F(x, y, z) {
     return (x & y) | ((~x) & z);
   }
   function md5_G(x, y, z) {
     return (x & z) | (y & (~z));
   }
   function md5_H(x, y, z) {
     return (x ^ y ^ z);
   }
   function md5_I(x, y, z) {
     return (y ^ (x | (~z)));
   }
   function md5_FF(a, b, c, d, x, s, ac) {
     a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_F(b, c, d), x), ac));
     return md5_AddUnsigned(md5_RotateLeft(a, s), b);
   };
   function md5_GG(a, b, c, d, x, s, ac) {
     a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_G(b, c, d), x), ac));
     return md5_AddUnsigned(md5_RotateLeft(a, s), b);
   };
   function md5_HH(a, b, c, d, x, s, ac) {
     a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_H(b, c, d), x), ac));
     return md5_AddUnsigned(md5_RotateLeft(a, s), b);
   };
   function md5_II(a, b, c, d, x, s, ac) {
     a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_I(b, c, d), x), ac));
     return md5_AddUnsigned(md5_RotateLeft(a, s), b);
   };
   function md5_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 md5_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 md5_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 = md5_Utf8Encode(string);
   x = md5_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 = md5_FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);
     d = md5_FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);
     c = md5_FF(c, d, a, b, x[k + 2], S13, 0x242070DB);
     b = md5_FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);
     a = md5_FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);
     d = md5_FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);
     c = md5_FF(c, d, a, b, x[k + 6], S13, 0xA8304613);
     b = md5_FF(b, c, d, a, x[k + 7], S14, 0xFD469501);
     a = md5_FF(a, b, c, d, x[k + 8], S11, 0x698098D8);
     d = md5_FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);
     c = md5_FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);
     b = md5_FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);
     a = md5_FF(a, b, c, d, x[k + 12], S11, 0x6B901122);
     d = md5_FF(d, a, b, c, x[k + 13], S12, 0xFD987193);
     c = md5_FF(c, d, a, b, x[k + 14], S13, 0xA679438E);
     b = md5_FF(b, c, d, a, x[k + 15], S14, 0x49B40821);
     a = md5_GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);
     d = md5_GG(d, a, b, c, x[k + 6], S22, 0xC040B340);
     c = md5_GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);
     b = md5_GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);
     a = md5_GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);
     d = md5_GG(d, a, b, c, x[k + 10], S22, 0x2441453);
     c = md5_GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);
     b = md5_GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);
     a = md5_GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);
     d = md5_GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);
     c = md5_GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);
     b = md5_GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);
     a = md5_GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);
     d = md5_GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);
     c = md5_GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);
     b = md5_GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);
     a = md5_HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);
     d = md5_HH(d, a, b, c, x[k + 8], S32, 0x8771F681);
     c = md5_HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);
     b = md5_HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);
     a = md5_HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);
     d = md5_HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);
     c = md5_HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);
     b = md5_HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);
     a = md5_HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);
     d = md5_HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);
     c = md5_HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);
     b = md5_HH(b, c, d, a, x[k + 6], S34, 0x4881D05);
     a = md5_HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);
     d = md5_HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);
     c = md5_HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);
     b = md5_HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);
     a = md5_II(a, b, c, d, x[k + 0], S41, 0xF4292244);
     d = md5_II(d, a, b, c, x[k + 7], S42, 0x432AFF97);
     c = md5_II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);
     b = md5_II(b, c, d, a, x[k + 5], S44, 0xFC93A039);
     a = md5_II(a, b, c, d, x[k + 12], S41, 0x655B59C3);
     d = md5_II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);
     c = md5_II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);
     b = md5_II(b, c, d, a, x[k + 1], S44, 0x85845DD1);
     a = md5_II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);
     d = md5_II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);
     c = md5_II(c, d, a, b, x[k + 6], S43, 0xA3014314);
     b = md5_II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);
     a = md5_II(a, b, c, d, x[k + 4], S41, 0xF7537E82);
     d = md5_II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);
     c = md5_II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);
     b = md5_II(b, c, d, a, x[k + 9], S44, 0xEB86D391);
     a = md5_AddUnsigned(a, AA);
     b = md5_AddUnsigned(b, BB);
     c = md5_AddUnsigned(c, CC);
     d = md5_AddUnsigned(d, DD);
   }
   return (md5_WordToHex(a) + md5_WordToHex(b) + md5_WordToHex(c) + md5_WordToHex(d)).toLowerCase();
 }
 module.exports = md5;