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js MD5加密处理

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关于MD5:


MD5.js是通过前台js加密的方式对用户信息,密码等私密信息进行加密处理的工具,也可称为插件。


在本案例中 可以看到MD5共有6种加密方法:


1,  hex_md5(value)


2,  b64_md5(value)


3,  str_md5(value)



关于MD5:


MD5.js是通过前台js加密的方式对用户信息,密码等私密信息进行加密处理的工具,也可称为插件。


在本案例中 可以看到MD5共有6种加密方法:


1,  hex_md5(value)


2,  b64_md5(value)


3,  str_md5(value)


4,  hex_hmac_md5(key, data)


5,  b64_hmac_md5(key, data)


6,  str_hmac_md5(key, data)




MD5.js 源代码如下 (可直接复制使用):




/*

 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message

 * Digest Algorithm, as defined in RFC 1321.

 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.

 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet

 * Distributed under the BSD License

 * See http://pajhome.org.uk/crypt/md5 for more info.

 */


/*

 * Configurable variables. You may need to tweak these to be compatible with

 * the server-side, but the defaults work in most cases.

 */

var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */

var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */

var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */


/*

 * These are the functions you'll usually want to call

 * They take string arguments and return either hex or base-64 encoded strings

 */

function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));}

function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));}

function str_md5(s){ return binl2str(core_md5(str2binl(s), s.length * chrsz));}

function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); }

function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); }

function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); }


/*

 * Perform a simple self-test to see if the VM is working

 */

function md5_vm_test()

{

  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";

}


/*

 * Calculate the MD5 of an array of little-endian words, and a bit length

 */

function core_md5(x, len)

{

  /* append padding */

  x[len >> 5] |= 0x80 << ((len) % 32);

  x[(((len + 64) >>> 9) << 4) + 14] = len;


  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 = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);

    d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);

    c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);

    b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);

    a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);

    d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);

    c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);

    b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);

    a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);

    d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);

    c = md5_ff(c, d, a, b, x[i+10], 17, -42063);

    b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);

    a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);

    d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);

    c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);

    b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);


    a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);

    d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);

    c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);

    b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);

    a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);

    d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);

    c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);

    b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);

    a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);

    d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);

    c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);

    b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);

    a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);

    d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);

    c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);

    b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);


    a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);

    d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);

    c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);

    b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);

    a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);

    d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);

    c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);

    b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);

    a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);

    d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);

    c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);

    b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);

    a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);

    d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);

    c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);

    b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);


    a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);

    d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);

    c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);

    b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);

    a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);

    d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);

    c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);

    b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);

    a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);

    d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);

    c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);

    b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);

    a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);

    d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);

    c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);

    b = md5_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 Array(a, b, c, d);


}


/*

 * These functions implement the four basic operations the algorithm uses.

 */

function md5_cmn(q, a, b, x, s, t)

{

  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);

}

function md5_ff(a, b, c, d, x, s, t)

{

  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);

}

function md5_gg(a, b, c, d, x, s, t)

{

  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);

}

function md5_hh(a, b, c, d, x, s, t)

{

  return md5_cmn(b ^ c ^ d, a, b, x, s, t);

}

function md5_ii(a, b, c, d, x, s, t)

{

  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);

}


/*

 * Calculate the HMAC-MD5, of a key and some data

 */

function core_hmac_md5(key, data)

{

  var bkey = str2binl(key);

  if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);


  var ipad = Array(16), opad = Array(16);

  for(var i = 0; i < 16; i++)

  {

    ipad[i] = bkey[i] ^ 0x36363636;

    opad[i] = bkey[i] ^ 0x5C5C5C5C;

  }


  var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);

  return core_md5(opad.concat(hash), 512 + 128);

}


/*

 * 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 bit_rol(num, cnt)

{

  return (num << cnt) | (num >>> (32 - cnt));

}


/*

 * Convert a string to an array of little-endian words

 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.

 */

function str2binl(str)

{

  var bin = Array();

  var mask = (1 << chrsz) - 1;

  for(var i = 0; i < str.length * chrsz; i += chrsz)

    bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);

  return bin;

}


/*

 * Convert an array of little-endian words to a string

 */

function binl2str(bin)

{

  var str = "";

  var mask = (1 << chrsz) - 1;

  for(var i = 0; i < bin.length * 32; i += chrsz)

    str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);

  return str;

}


/*

 * Convert an array of little-endian words to a hex string.

 */

function binl2hex(binarray)

{

  var hex_tab = hexcase ? "0123456789ABCDEF" : "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 base-64 string

 */

function binl2b64(binarray)

{

  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

  var str = "";

  for(var i = 0; i < binarray.length * 4; i += 3)

  {

    var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)

                | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )

                |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);

    for(var j = 0; j < 4; j++)

    {

      if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;

      else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);

    }

  }

  return str;

}





MD5加密优缺点:


1,用js对私密信息加密可避免在网络中输入明文信息,被他人截取数据包而造成数据泄露。


2,避免缓存中自动缓存密码。比如在使用火狐浏览器登陆时,输入的用户名及密码自动缓存后,下次登陆无需输入密码就可实现登录,这样就给别人留下了漏洞,当别人使用你的电脑登陆那么你的密码就泄露了。使用js加密时,缓存的加密后的密文,用密文做密码登录是不成功的,即使泄露也是泄露的密文,对密码不会造成威胁。  缺点是: 每次登陆时都要手动输入密码,比较麻烦。


3,使用js加密,减少了服务器加密时的资源消耗,从理论上提高了服务器的性能。为了安全,很有必要在做服务端的加密,无论从理论还是实际,两道门比一道门要安全些,至少给攻击者造成了一个障碍。


使用详情:




<script src="js/md5.js"></script>

    <script>

        var code = "123456";

        var username = "123456";

        var password = "123456";

        var str1 = hex_md5("123456");

        var str2 = b64_md5("123456");

        var str3 = str_md5("123456");

        var str4 = hex_hmac_md5(code,code);

        var str5 = b64_hmac_md5(username,username);

        var str6 = str_hmac_md5(password,password);

        console.log(str1);            // e10adc3949ba59abbe56e057f20f883e

        console.log(str2);            // 4QrcOUm6Wau+VuBX8g+IPg

        console.log(str3);            // áÜ9IºY«¾VàWòˆ>

        console.log(str4);            // 30ce71a73bdd908c3955a90e8f7429ef

        console.log(str5);            // MM5xpzvdkIw5VakOj3Qp7w

        console.log(str6);            // 0Îq§;ݐŒ9U©t)ï

document.write("<title>");

document.write(str1); document.write("</title>");

    </script>



全文详见:http://it-club.cn/post/196.html

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