关于微信小程序MD5的方法的解析

微信小程序 MD5的方法详解

生成的文件可以放在 utils文件中哦！！！

/*   * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message   * Digest Algorithm, as defined in RFC 1321.   * Version 1.1 Copyright (C) Paul Johnston 1999 - 2002.   * Code also contributed by Greg Holt   * See http://pajhome.org.uk/site/legal.html for details.   */      /*   * Add integers, wrapping at 2^32. This uses 16-bit operations internally   * to work around bugs in some JS interpreters.   */   function safe_add(x, y)   {    var lsw = (x & 0xFFFF) + (y & 0xFFFF)    var msw = (x >> 16) + (y >> 16) + (lsw >> 16)    return (msw << 16) | (lsw & 0xFFFF)   }      /*   * Bitwise rotate a 32-bit number to the left.   */   function rol(num, cnt)   {    return (num << cnt) | (num >>> (32 - cnt))   }      /*   * These functions implement the four basic operations the algorithm uses.   */   function cmn(q, a, b, x, s, t)   {    return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)   }   function ff(a, b, c, d, x, s, t)   {    return cmn((b & c) | ((~b) & d), a, b, x, s, t)   }   function gg(a, b, c, d, x, s, t)   {    return cmn((b & d) | (c & (~d)), a, b, x, s, t)   }   function hh(a, b, c, d, x, s, t)   {    return cmn(b ^ c ^ d, a, b, x, s, t)   }   function ii(a, b, c, d, x, s, t)   {    return cmn(c ^ (b | (~d)), a, b, x, s, t)   }      /*   * Calculate the MD5 of an array of little-endian words, producing an array   * of little-endian words.   */   function coreMD5(x)   {    var a = 1732584193    var b = -271733879    var c = -1732584194    var d = 271733878       for(var i = 0; i < x.length; i += 16)    {     var olda = a     var oldb = b     var oldc = c     var oldd = d        a = ff(a, b, c, d, x[i+ 0], 7 , -680876936)     d = ff(d, a, b, c, x[i+ 1], 12, -389564586)     c = ff(c, d, a, b, x[i+ 2], 17, 606105819)     b = ff(b, c, d, a, x[i+ 3], 22, -1044525330)     a = ff(a, b, c, d, x[i+ 4], 7 , -176418897)     d = ff(d, a, b, c, x[i+ 5], 12, 1200080426)     c = ff(c, d, a, b, x[i+ 6], 17, -1473231341)     b = ff(b, c, d, a, x[i+ 7], 22, -45705983)     a = ff(a, b, c, d, x[i+ 8], 7 , 1770035416)     d = ff(d, a, b, c, x[i+ 9], 12, -1958414417)     c = ff(c, d, a, b, x[i+10], 17, -42063)     b = ff(b, c, d, a, x[i+11], 22, -1990404162)     a = ff(a, b, c, d, x[i+12], 7 , 1804603682)     d = ff(d, a, b, c, x[i+13], 12, -40341101)     c = ff(c, d, a, b, x[i+14], 17, -1502002290)     b = ff(b, c, d, a, x[i+15], 22, 1236535329)        a = gg(a, b, c, d, x[i+ 1], 5 , -165796510)     d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632)     c = gg(c, d, a, b, x[i+11], 14, 643717713)     b = gg(b, c, d, a, x[i+ 0], 20, -373897302)     a = gg(a, b, c, d, x[i+ 5], 5 , -701558691)     d = gg(d, a, b, c, x[i+10], 9 , 38016083)     c = gg(c, d, a, b, x[i+15], 14, -660478335)     b = gg(b, c, d, a, x[i+ 4], 20, -405537848)     a = gg(a, b, c, d, x[i+ 9], 5 , 568446438)     d = gg(d, a, b, c, x[i+14], 9 , -1019803690)     c = gg(c, d, a, b, x[i+ 3], 14, -187363961)     b = gg(b, c, d, a, x[i+ 8], 20, 1163531501)     a = gg(a, b, c, d, x[i+13], 5 , -1444681467)     d = gg(d, a, b, c, x[i+ 2], 9 , -51403784)     c = gg(c, d, a, b, x[i+ 7], 14, 1735328473)     b = gg(b, c, d, a, x[i+12], 20, -1926607734)        a = hh(a, b, c, d, x[i+ 5], 4 , -378558)     d = hh(d, a, b, c, x[i+ 8], 11, -2022574463)     c = hh(c, d, a, b, x[i+11], 16, 1839030562)     b = hh(b, c, d, a, x[i+14], 23, -35309556)     a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060)     d = hh(d, a, b, c, x[i+ 4], 11, 1272893353)     c = hh(c, d, a, b, x[i+ 7], 16, -155497632)     b = hh(b, c, d, a, x[i+10], 23, -1094730640)     a = hh(a, b, c, d, x[i+13], 4 , 681279174)     d = hh(d, a, b, c, x[i+ 0], 11, -358537222)     c = hh(c, d, a, b, x[i+ 3], 16, -722521979)     b = hh(b, c, d, a, x[i+ 6], 23, 76029189)     a = hh(a, b, c, d, x[i+ 9], 4 , -640364487)     d = hh(d, a, b, c, x[i+12], 11, -421815835)     c = hh(c, d, a, b, x[i+15], 16, 530742520)     b = hh(b, c, d, a, x[i+ 2], 23, -995338651)        a = ii(a, b, c, d, x[i+ 0], 6 , -198630844)     d = ii(d, a, b, c, x[i+ 7], 10, 1126891415)     c = ii(c, d, a, b, x[i+14], 15, -1416354905)     b = ii(b, c, d, a, x[i+ 5], 21, -57434055)     a = ii(a, b, c, d, x[i+12], 6 , 1700485571)     d = ii(d, a, b, c, x[i+ 3], 10, -1894986606)     c = ii(c, d, a, b, x[i+10], 15, -1051523)     b = ii(b, c, d, a, x[i+ 1], 21, -2054922799)     a = ii(a, b, c, d, x[i+ 8], 6 , 1873313359)     d = ii(d, a, b, c, x[i+15], 10, -30611744)     c = ii(c, d, a, b, x[i+ 6], 15, -1560198380)     b = ii(b, c, d, a, x[i+13], 21, 1309151649)     a = ii(a, b, c, d, x[i+ 4], 6 , -145523070)     d = ii(d, a, b, c, x[i+11], 10, -1120210379)     c = ii(c, d, a, b, x[i+ 2], 15, 718787259)     b = ii(b, c, d, a, x[i+ 9], 21, -343485551)        a = safe_add(a, olda)     b = safe_add(b, oldb)     c = safe_add(c, oldc)     d = safe_add(d, oldd)    }    return [a, b, c, d]   }      /*   * Convert an array of little-endian words to a hex string.   */   function binl2hex(binarray)   {    var hex_tab = "0123456789abcdef"    var str = ""    for(var i = 0; i < binarray.length * 4; i++)    {     str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +         hex_tab.charAt((binarray[i>>2] >> ((i%4)*8)) & 0xF)    }    return str   }      /*   * Convert an array of little-endian words to a base64 encoded string.   */   function binl2b64(binarray)   {    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"    var str = ""    for(var i = 0; i < binarray.length * 32; i += 6)    {     str += tab.charAt(((binarray[i>>5] << (i%32)) & 0x3F) |              ((binarray[i>>5+1] >> (32-i%32)) & 0x3F))    }    return str   }      /*   * Convert an 8-bit character string to a sequence of 16-word blocks, stored   * as an array, and append appropriate padding for MD4/5 calculation.   * If any of the characters are >255, the high byte is silently ignored.   */   function str2binl(str)   {    var nblk = ((str.length + 8) >> 6) + 1 // number of 16-word blocks    var blks = new Array(nblk * 16)    for(var i = 0; i < nblk * 16; i++) blks[i] = 0    for(var i = 0; i < str.length; i++)     blks[i>>2] |= (str.charCodeAt(i) & 0xFF) << ((i%4) * 8)    blks[i>>2] |= 0x80 << ((i%4) * 8)    blks[nblk*16-2] = str.length * 8    return blks   }      /*   * Convert a wide-character string to a sequence of 16-word blocks, stored as   * an array, and append appropriate padding for MD4/5 calculation.   */   function strw2binl(str)   {    var nblk = ((str.length + 4) >> 5) + 1 // number of 16-word blocks    var blks = new Array(nblk * 16)    for(var i = 0; i < nblk * 16; i++) blks[i] = 0    for(var i = 0; i < str.length; i++)     blks[i>>1] |= str.charCodeAt(i) << ((i%2) * 16)    blks[i>>1] |= 0x80 << ((i%2) * 16)    blks[nblk*16-2] = str.length * 16    return blks   }      /*   * External interface   */   function hexMD5 (str) { return binl2hex(coreMD5( str2binl(str))) }   function hexMD5w(str) { return binl2hex(coreMD5(strw2binl(str))) }   function b64MD5 (str) { return binl2b64(coreMD5( str2binl(str))) }   function b64MD5w(str) { return binl2b64(coreMD5(strw2binl(str))) }   /* Backward compatibility */   function calcMD5(str) { return binl2hex(coreMD5( str2binl(str))) }   module.exports = {    hexMD5: hexMD5   }

var utilMd5 = require('../../utils/md5.js');   var password = utilMd5.hexMD5(password);

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