微信小程序 MD5加密
在小程序中，页面的脚本逻辑是在JsCore中运行，JsCore是一个没有窗口对象的环境，所以不能在脚本中使用window，也无法在脚本中操作组件。zepto/jquery 也无法使用，因为zepto/jquery 会使用到window对象和document对象。所以在微信小程序中不能使用jquery.md5.js对密码进行加密。下面我提供一种MD5.js加密实例，本实例先静态演示，后面再到小程序中演示。
md5.js程序如下：
/* * 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(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))) } md5.html页面程序如下：
<html><head><script language='javascript' src='md5.js'></script><!--引入MD5加密--><script language="javascript"><!--function my_do()//通过js对数据进行加密 { //var URL="http://127.0.0.1/index.jsp?"; //var dqz_out=""; var dqz_in=document.my_form1.my_in_1.value; document.my_form1.my_out_1.value=hexMD5(dqz_in); document.my_form1.my_out_2.value=hexMD5w(dqz_in); document.my_form1.my_out_3.value=b64MD5(dqz_in); document.my_form1.my_out_4.value=b64MD5w(dqz_in); //URL=URL+"in="+dqz_in+"&out="+dqz_out; //my_form1.action = URL; //window.open(URL,'',''); //my_form1.submit(); }//--></script></head><body><form name="my_form1" method="get" action=""> <p>计算MD5加密结果的例子<br> 请输入加密内容： <textarea name="my_in_1" cols="70" rows="10">1234567890</textarea> <br> 点击右边的文本框显示结果：<br><!--mouseup某个鼠标按键被松开，mouseout鼠标从某个元素移开-->hexMD5()= <input name="my_out_1" type="text" onChange="my_do()" onMouseUp="my_do()" onMouseOut="my_do()" size="50" maxlength="50"><br> hexMD5w()=<input name="my_out_2" type="text" onChange="my_do()" onMouseUp="my_do()" onMouseOut="my_do()" size="50" maxlength="50"><br>b64MD5()= <input name="my_out_3" type="text" onChange="my_do()" onMouseUp="my_do()" onMouseOut="my_do()" size="50" maxlength="50"><br>b64MD5w()=<input name="my_out_4" type="text" onChange="my_do()" onMouseUp="my_do()" onMouseOut="my_do()" size="50" maxlength="50"><br> <br> </p></form></body></html>md5.js加密效果如图：
下面介绍微信小程序如何加密――模块化
我们可以将一些公共的代码抽离成为一个单独的 js 文件，作为一个模块。模块只有通过 module.exports 或者 exports 才能对外暴露接口。需要注意的是：
（1）、 exports 是 module.exports 的一个引用，因此在模块里边随意更改 exports 的指向会造成未知的错误。所以我们更推荐开发者采用 module.exports 来暴露模块接口，除非你已经清晰知道这两者的关系。
（2）、小程序目前不支持直接引入 node_modules , 开发者需要使用到 node_modules 时候建议拷贝出相关的代码到小程序的目录中。
// common.js function sayHello(name) { console.log(`Hello ${name} !`) } function sayGoodbye(name) { console.log(`Goodbye ${name} !`) } module.exports.sayHello = sayHello exports.sayGoodbye = sayGoodbye 在需要使用这些模块的文件中，使用 require(path) 将公共代码引入
var common = require('common.js') Page({ helloMINA: function() { common.sayHello('MINA') }, goodbyeMINA: function() { common.sayGoodbye('MINA') } }) 仿照模块化方法我们可以加入MD5.js加密：
md5.js程序如下：
/* * 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 } 使用程序如下：
//index.js var util = require('../../utils/md5.js') //获取应用实例 var app = getApp() Page({ data: { page:'1', }, var password=value.password; if(password===""||password===null){ wx.showModal({ title:'提示', content: '密码不能为空', confirmColor:'#118EDE', showCancel: false, success: function (res) { if (res.confirm) { //console.log('用户点击确定') } } }); return false; }else{ password=util.hexMD5(password); } }) 感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！
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