javascript /微信小程序中MD5加密

     最近空余时间想捣鼓小程序访问OLAMI自然语言接口，这个接口的sign要求进行MD5加密，现分享一下代码：

该加密方式最终会转为纯小写字母，需要大写的话可以修改function md5(string) 函数中的 return temp.toLowerCase();

MD5加密结果唯一。

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 temp = WordToHex(a) + WordToHex(b) + WordToHex(c) + WordToHex(d);  return temp.toLowerCase();}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) {  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;}module.exports = {  md5: md5}

     本人是在微信小程序中调用的，因此，文档的最后使用module.exports将md5函数设置为export,以便其他文件调用。

调用方式为：

    首先，将上面的代码保存，例如文件名为MD5.js, 然后按照下面方式调用,其中originalSign为String,是转化前的内容。

var MD5 = require('../../MD5.js');

//调用函数var sign = MD5.md5(originalSign);

      本程序在微信小程序中验证成功。

小程序体验：扫下面的二维码

 

完整代码下载：

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