JavaScript MD5 加密算法

By Rainbow on // JavaScript // 4568 Views+ // (1) Comments

JavaScript MD5 加密算法

在一般网站开发中,用户登陆的密码都是明码发送的,这样是很不安全的.
解决方法:在提交前,用JavaScript将用户密码进行sha1或md5加密.

首先说说MD5：

MD5用的是哈希函数,在计算机网络中应用较多的不可逆加密算法有RSA公司发明的MD5算法和由美国国家技术标准研究所建议的安全散列算法SHA.

虽说已经被破解（见百度百科），但仍然是我们的加密首选。

说说用JS MD5加密的优点：

由于表单(form)在提交的时候，无论是通过GET方法还是通过POST方法，密码在提交时都会以明码的方式进行发送，很不安全。

如果不是在SSL下传输的数据比较容易被分析出表单提交的密码。

优点：

1、如上所述，增加了安全性，

2、用JavaScript在客户端来加密可以减少服务器端的运算。

这是MD5的js加密代码的DEMO。其中也有MD4和SHA1的JS加密代码。原页面也又包含JS的用法

代码：

md5.js

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/*  
 * 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.  
 */  
var hexcase = 0;   
var b64pad  = "";   
var chrsz   = 8;   
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)); }   
function md5_vm_test()   
{   
  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";   
}   
function core_md5(x, len)   
{   
  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);   
}   
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);   
}   
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);   
}   
function safe_add(x, y)   
{   
  var lsw = (x & 0xFFFF) + (y & 0xFFFF);   
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);   
  return (msw < < 16) | (lsw & 0xFFFF);   
}   
function bit_rol(num, cnt)   
{   
  return (num << cnt) | (num >>> (32 - cnt));   
}   
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;   
}   
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;   
}   
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;   
}   
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;   
}  
 
/*
 * 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.
 */
var hexcase = 0;
var b64pad  = "";
var chrsz   = 8;
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)); }
function md5_vm_test()
{
  return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
}
function core_md5(x, len)
{
  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);
}
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);
}
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);
}
function safe_add(x, y)
{
  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw < < 16) | (lsw & 0xFFFF);
}
function bit_rol(num, cnt)
{
  return (num << cnt) | (num >>> (32 - cnt));
}
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;
}
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;
}
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;
}
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;
}

HTML页面中：

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<script src="md5.js" type=text/javascript></script>  
<script type=text/javascript>  
    hash = hex_md5("input string"); //产生的hash变量就是"input string"的md5值，用在表单提交时，修改按钮的onClick事件就可以做到加密了  
</script>

产生的hash变量就是”input string”的md5值，用在表单提交时，修改按钮的onClick事件就可以做到加密了

原文来自： 奇亚 – http://kiya.cn

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