javascript 实现MD5加密分析

熊孩纸 阅读:172 2021-03-31 23:33:23 评论:0


1、引入md5.JS

<script src="scripts/md5.js" type="text/javascript"></script> 


2、md5.JS 内容如下

* 
 * 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; 
} 


3、加密

var md5Value=hex_md5("需要被加密的字符串"); 
alert("加密后的值为:"+md5Value);



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