自己写的JS怎么给它做下简单的加密,要不要工具

JavaScript022

自己写的JS怎么给它做下简单的加密,要不要工具,第1张

最简单的就是安装一款文件夹加密软件。

1 下载安装文件夹加密超级大师。

2 在需要加密的文件夹上单击右键选择加密。

3 输入你想设置的密码,点击确定就ok了。

一:最简单的加密解密

大家对于JAVASCRIPT函数escape()和unescape()想必是比较了解啦(很多网页加密在用它们),分别是编码和解码字符串,比如例子代码用escape()函数加密后变为如下格式:

alert%28%22%u9ED1%u5BA2%u9632%u7EBF%22%29%3B

如何?还看的懂吗?当然其中的ASCII字符"alert"并没有被加密,如果愿意我们可以写点JAVASCRIPT代码重新把它加密如下:

%61%6C%65%72%74%28%22%u9ED1%u5BA2%u9632%u7EBF%22%29%3B

呵呵!如何?这次是完全都加密了!

当然,这样加密后的代码是不能直接运行的,幸好还有eval(codeString)可用,这个函数的作用就是检查JavaScript代码并执行,必选项 codeString 参数是包含有效 JavaScript 代码的字符串值,加上上面的解码unescape(),加密后的结果如下:

<SCRIPT LANGUAGE="JavaScript">

var code=unescape("%61%6C%65%72%74%28%22%u9ED1%u5BA2%u9632%u7EBF%22%29%3B")

eval(code)

</SCRIPT>

是不是很简单?不要高兴,解密也就同样的简单,解密代码都摆给别人啦(unescape())!呵呵

二:转义字符"\"的妙用

大家可能对转义字符"\"不太熟悉,但对于JavaScript提供了一些特殊字符如:\n (换行)、 \r (回车)、\' (单引号 )等应该是有所了解的吧?其实"\"后面还可以跟八进制或十六进制的数字,如字符"a"则可以表示为:"\141"或"\x61"(注意是小写字符"x"),至于双字节字符如汉字"黑"则仅能用十六进制表示为"\u9ED1"(注意是小写字符"u"),其中字符"u"表示是双字节字符,根据这个原理例子代码则可以表示为:

八进制转义字符串如下:

<SCRIPT LANGUAGE="JavaScript">

eval("\141\154\145\162\164\50\42\u9ED1\u5BA2\u9632\u7EBF\42\51\73")

</SCRIPT>

十六进制转义字符串如下:

<SCRIPT LANGUAGE="JavaScript">

eval("\x61\x6C\x65\x72\x74\x28\x22\u9ED1\u5BA2\u9632\u7EBF\x22\x29\x3B")

</SCRIPT>

这次没有了解码函数,因为JavaScript执行时会自行转换,同样解码也是很简单如下:

<SCRIPT LANGUAGE="JavaScript">

alert("\x61\x6C\x65\x72\x74\x28\x22\u9ED1\u5BA2\u9632\u7EBF\x22\x29\x3B")

</SCRIPT>

就会弹出对话框告诉你解密后的结果!

使用下面的函数,例如varpwd=hex_md5("hello world")对"hello world"进行md5加密。var hexcase = 0

function hex_md5(a) {

   if (a == "") return a

   return rstr2hex(rstr_md5(str2rstr_utf8(a)))

}

function hex_hmac_md5(a, b) {

   return rstr2hex(rstr_hmac_md5(str2rstr_utf8(a), str2rstr_utf8(b)))

}

function md5_vm_test() {

   return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72"

}

function rstr_md5(a) {

   return binl2rstr(binl_md5(rstr2binl(a), a.length * 8))

}

function rstr_hmac_md5(c, f) {

   var e = rstr2binl(c)

   if (e.length >16) {

       e = binl_md5(e, c.length * 8)

   }

   var a = Array(16),

   d = Array(16)

   for (var b = 0b <16b++) {

       a[b] = e[b] ^ 909522486

       d[b] = e[b] ^ 1549556828

   }

   var g = binl_md5(a.concat(rstr2binl(f)), 512 + f.length * 8)

   return binl2rstr(binl_md5(d.concat(g), 512 + 128))

}

function rstr2hex(c) {

   try {

       hexcase

   } catch(g) {

       hexcase = 0

   }

   var f = hexcase ? "0123456789ABCDEF": "0123456789abcdef"

   var b = ""

   var a

   for (var d = 0d <c.lengthd++) {

       a = c.charCodeAt(d)

       b += f.charAt((a >>>4) &15) + f.charAt(a &15)

   }

   return b

}

function str2rstr_utf8(c) {

   var b = ""

   var d = -1

   var a, e

   while (++d <c.length) {

       a = c.charCodeAt(d)

       e = d + 1 <c.length ? c.charCodeAt(d + 1) : 0

       if (55296 <= a &&a <= 56319 &&56320 <= e &&e <= 57343) {

           a = 65536 + ((a &1023) <<10) + (e &1023)

           d++

       }

       if (a <= 127) {

           b += String.fromCharCode(a)

       } else {

           if (a <= 2047) {

               b += String.fromCharCode(192 | ((a >>>6) &31), 128 | (a &63))

           } else {

               if (a <= 65535) {

                   b += String.fromCharCode(224 | ((a >>>12) &15), 128 | ((a >>>6) &63), 128 | (a &63))

               } else {

                   if (a <= 2097151) {

                       b += String.fromCharCode(240 | ((a >>>18) &7), 128 | ((a >>>12) &63), 128 | ((a >>>6) &63), 128 | (a &63))

                   }

               }

           }

       }

   }

   return b

}

function rstr2binl(b) {

   var a = Array(b.length >>2)

   for (var c = 0c <a.lengthc++) {

       a[c] = 0

   }

   for (var c = 0c <b.length * 8c += 8) {

       a[c >>5] |= (b.charCodeAt(c / 8) &255) <<(c % 32)

   }

   return a

}

function binl2rstr(b) {

   var a = ""

   for (var c = 0c <b.length * 32c += 8) {

       a += String.fromCharCode((b[c >>5] >>>(c % 32)) &255)

   }

   return a

}

function binl_md5(p, k) {

   p[k >>5] |= 128 <<((k) % 32)

   p[(((k + 64) >>>9) <<4) + 14] = k

   var o = 1732584193

   var n = -271733879

   var m = -1732584194

   var l = 271733878

   for (var g = 0g <p.lengthg += 16) {

       var j = o

       var h = n

       var f = m

       var e = l

       o = md5_ff(o, n, m, l, p[g + 0], 7, -680876936)

       l = md5_ff(l, o, n, m, p[g + 1], 12, -389564586)

       m = md5_ff(m, l, o, n, p[g + 2], 17, 606105819)

       n = md5_ff(n, m, l, o, p[g + 3], 22, -1044525330)

       o = md5_ff(o, n, m, l, p[g + 4], 7, -176418897)

       l = md5_ff(l, o, n, m, p[g + 5], 12, 1200080426)

       m = md5_ff(m, l, o, n, p[g + 6], 17, -1473231341)

       n = md5_ff(n, m, l, o, p[g + 7], 22, -45705983)

       o = md5_ff(o, n, m, l, p[g + 8], 7, 1770035416)

       l = md5_ff(l, o, n, m, p[g + 9], 12, -1958414417)

       m = md5_ff(m, l, o, n, p[g + 10], 17, -42063)

       n = md5_ff(n, m, l, o, p[g + 11], 22, -1990404162)

       o = md5_ff(o, n, m, l, p[g + 12], 7, 1804603682)

       l = md5_ff(l, o, n, m, p[g + 13], 12, -40341101)

       m = md5_ff(m, l, o, n, p[g + 14], 17, -1502002290)

       n = md5_ff(n, m, l, o, p[g + 15], 22, 1236535329)

       o = md5_gg(o, n, m, l, p[g + 1], 5, -165796510)

       l = md5_gg(l, o, n, m, p[g + 6], 9, -1069501632)

       m = md5_gg(m, l, o, n, p[g + 11], 14, 643717713)

       n = md5_gg(n, m, l, o, p[g + 0], 20, -373897302)

       o = md5_gg(o, n, m, l, p[g + 5], 5, -701558691)

       l = md5_gg(l, o, n, m, p[g + 10], 9, 38016083)

       m = md5_gg(m, l, o, n, p[g + 15], 14, -660478335)

       n = md5_gg(n, m, l, o, p[g + 4], 20, -405537848)

       o = md5_gg(o, n, m, l, p[g + 9], 5, 568446438)

       l = md5_gg(l, o, n, m, p[g + 14], 9, -1019803690)

       m = md5_gg(m, l, o, n, p[g + 3], 14, -187363961)

       n = md5_gg(n, m, l, o, p[g + 8], 20, 1163531501)

       o = md5_gg(o, n, m, l, p[g + 13], 5, -1444681467)

       l = md5_gg(l, o, n, m, p[g + 2], 9, -51403784)

       m = md5_gg(m, l, o, n, p[g + 7], 14, 1735328473)

       n = md5_gg(n, m, l, o, p[g + 12], 20, -1926607734)

       o = md5_hh(o, n, m, l, p[g + 5], 4, -378558)

       l = md5_hh(l, o, n, m, p[g + 8], 11, -2022574463)

       m = md5_hh(m, l, o, n, p[g + 11], 16, 1839030562)

       n = md5_hh(n, m, l, o, p[g + 14], 23, -35309556)

       o = md5_hh(o, n, m, l, p[g + 1], 4, -1530992060)

       l = md5_hh(l, o, n, m, p[g + 4], 11, 1272893353)

       m = md5_hh(m, l, o, n, p[g + 7], 16, -155497632)

       n = md5_hh(n, m, l, o, p[g + 10], 23, -1094730640)

       o = md5_hh(o, n, m, l, p[g + 13], 4, 681279174)

       l = md5_hh(l, o, n, m, p[g + 0], 11, -358537222)

       m = md5_hh(m, l, o, n, p[g + 3], 16, -722521979)

       n = md5_hh(n, m, l, o, p[g + 6], 23, 76029189)

       o = md5_hh(o, n, m, l, p[g + 9], 4, -640364487)

       l = md5_hh(l, o, n, m, p[g + 12], 11, -421815835)

       m = md5_hh(m, l, o, n, p[g + 15], 16, 530742520)

       n = md5_hh(n, m, l, o, p[g + 2], 23, -995338651)

       o = md5_ii(o, n, m, l, p[g + 0], 6, -198630844)

       l = md5_ii(l, o, n, m, p[g + 7], 10, 1126891415)

       m = md5_ii(m, l, o, n, p[g + 14], 15, -1416354905)

       n = md5_ii(n, m, l, o, p[g + 5], 21, -57434055)

       o = md5_ii(o, n, m, l, p[g + 12], 6, 1700485571)

       l = md5_ii(l, o, n, m, p[g + 3], 10, -1894986606)

       m = md5_ii(m, l, o, n, p[g + 10], 15, -1051523)

       n = md5_ii(n, m, l, o, p[g + 1], 21, -2054922799)

       o = md5_ii(o, n, m, l, p[g + 8], 6, 1873313359)

       l = md5_ii(l, o, n, m, p[g + 15], 10, -30611744)

       m = md5_ii(m, l, o, n, p[g + 6], 15, -1560198380)

       n = md5_ii(n, m, l, o, p[g + 13], 21, 1309151649)

       o = md5_ii(o, n, m, l, p[g + 4], 6, -145523070)

       l = md5_ii(l, o, n, m, p[g + 11], 10, -1120210379)

       m = md5_ii(m, l, o, n, p[g + 2], 15, 718787259)

       n = md5_ii(n, m, l, o, p[g + 9], 21, -343485551)

       o = safe_add(o, j)

       n = safe_add(n, h)

       m = safe_add(m, f)

       l = safe_add(l, e)

   }

   return Array(o, n, m, l)

}

function md5_cmn(h, e, d, c, g, f) {

   return safe_add(bit_rol(safe_add(safe_add(e, h), safe_add(c, f)), g), d)

}

function md5_ff(g, f, k, j, e, i, h) {

   return md5_cmn((f &k) | ((~f) &j), g, f, e, i, h)

}

function md5_gg(g, f, k, j, e, i, h) {

   return md5_cmn((f &j) | (k &(~j)), g, f, e, i, h)

}

function md5_hh(g, f, k, j, e, i, h) {

   return md5_cmn(f ^ k ^ j, g, f, e, i, h)

}

function md5_ii(g, f, k, j, e, i, h) {

   return md5_cmn(k ^ (f | (~j)), g, f, e, i, h)

}

function safe_add(a, d) {

   var c = (a &65535) + (d &65535)

   var b = (a >>16) + (d >>16) + (c >>16)

   return (b <<16) | (c &65535)

}

function bit_rol(a, b) {

   return (a <<b) | (a >>>(32 - b))

}