欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

JS常用加密编码与算法实例总结

程序员文章站 2022-05-28 21:22:09
本文实例讲述了js常用加密编码与算法。分享给大家供大家参考,具体如下: 一:utf8编码函数 function urlencode(str){ if(str...

本文实例讲述了js常用加密编码与算法。分享给大家供大家参考,具体如下:

一:utf8编码函数

function urlencode(str){
 if(str==null||str=="")
  return "";
 var newstr="";
 function tocase(sstr){
  return sstr.tostring(16).touppercase();
  }
 for(var i=0,icode,len=str.length;i<len;i++){
  icode=str.charcodeat(i);
  if( icode<0x10)
   newstr+="%0"+icode.tostring(16).touppercase();
  else if(icode<0x80){
   if(icode==0x20)
    newstr+="+";
   else if((icode>=0x30&&icode<=0x39)||(icode>=0x41&&icode<=0x5a)||(icode>=0x61&&icode<=0x7a))
    newstr+=str.charat(i);
   else
    newstr+="%"+tocase(icode);
   }
  else if(icode<0x800){
   newstr+="%"+tocase(0xc0+(icode>>6));
   newstr+="%"+tocase(0x80+icode%0x40);
   }
  else{
   newstr+="%"+tocase(0xe0+(icode>>12));
   newstr+="%"+tocase(0x80+(icode>>6)%0x40);
   newstr+="%"+tocase(0x80+icode%0x40);
   }
  }
 return newstr;
 }

二:base64编码,解码函数

var base64encodechars = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64decodechars = new array(
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
  52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
  -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
  15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
  -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
  41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
function base64encode(str) {
  var out, i, len;
  var c1, c2, c3;
  len = str.length;
  i = 0;
  out = "";
  while(i < len) {
  c1 = str.charcodeat(i++) & 0xff;
  if(i == len)
  {
    out += base64encodechars.charat(c1 >> 2);
    out += base64encodechars.charat((c1 & 0x3) << 4);
    out += "==";
    break;
  }
  c2 = str.charcodeat(i++);
  if(i == len)
  {
    out += base64encodechars.charat(c1 >> 2);
    out += base64encodechars.charat(((c1 & 0x3)<< 4) | ((c2 & 0xf0) >> 4));
    out += base64encodechars.charat((c2 & 0xf) << 2);
    out += "=";
    break;
  }
  c3 = str.charcodeat(i++);
  out += base64encodechars.charat(c1 >> 2);
  out += base64encodechars.charat(((c1 & 0x3)<< 4) | ((c2 & 0xf0) >> 4));
  out += base64encodechars.charat(((c2 & 0xf) << 2) | ((c3 & 0xc0) >>6));
  out += base64encodechars.charat(c3 & 0x3f);
  }
  return out;
}
function base64decode(str) {
  var c1, c2, c3, c4;
  var i, len, out;
  len = str.length;
  i = 0;
  out = "";
  while(i < len) {
  /* c1 */
  do {
    c1 = base64decodechars[str.charcodeat(i++) & 0xff];
  } while(i < len && c1 == -1);
  if(c1 == -1)
    break;
  /* c2 */
  do {
    c2 = base64decodechars[str.charcodeat(i++) & 0xff];
  } while(i < len && c2 == -1);
  if(c2 == -1)
    break;
  out += string.fromcharcode((c1 << 2) | ((c2 & 0x30) >> 4));
  /* c3 */
  do {
    c3 = str.charcodeat(i++) & 0xff;
    if(c3 == 61)
    return out;
    c3 = base64decodechars[c3];
  } while(i < len && c3 == -1);
  if(c3 == -1)
    break;
  out += string.fromcharcode(((c2 & 0xf) << 4) | ((c3 & 0x3c) >> 2));
  /* c4 */
  do {
    c4 = str.charcodeat(i++) & 0xff;
    if(c4 == 61)
    return out;
    c4 = base64decodechars[c4];
  } while(i < len && c4 == -1);
  if(c4 == -1)
    break;
  out += string.fromcharcode(((c3 & 0x03) << 6) | c4);
  }
  return out;
}
function utf16to8(str) {
  var out, i, len, c;
  out = "";
  len = str.length;
  for(i = 0; i < len; i++) {
  c = str.charcodeat(i);
  if ((c >= 0x0001) && (c <= 0x007f)) {
    out += str.charat(i);
  } else if (c > 0x07ff) {
    out += string.fromcharcode(0xe0 | ((c >> 12) & 0x0f));
    out += string.fromcharcode(0x80 | ((c >> 6) & 0x3f));
    out += string.fromcharcode(0x80 | ((c >> 0) & 0x3f));
  } else {
    out += string.fromcharcode(0xc0 | ((c >> 6) & 0x1f));
    out += string.fromcharcode(0x80 | ((c >> 0) & 0x3f));
  }
  }
  return out;
}
function utf8to16(str) {
  var out, i, len, c;
  var char2, char3;
  out = "";
  len = str.length;
  i = 0;
  while(i < len) {
  c = str.charcodeat(i++);
  switch(c >> 4)
  {
   case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
    // 0xxxxxxx
    out += str.charat(i-1);
    break;
   case 12: case 13:
    // 110x xxxx 10xx xxxx
    char2 = str.charcodeat(i++);
    out += string.fromcharcode(((c & 0x1f) << 6) | (char2 & 0x3f));
    break;
   case 14:
    // 1110 xxxx 10xx xxxx 10xx xxxx
    char2 = str.charcodeat(i++);
    char3 = str.charcodeat(i++);
    out += string.fromcharcode(((c & 0x0f) << 12) |
            ((char2 & 0x3f) << 6) |
            ((char3 & 0x3f) << 0));
    break;
  }
  }
  return out;
}
function doit() {
  var f = document.f
  f.output.value = base64encode(utf16to8(f.source.value))
  f.decode.value = utf8to16(base64decode(f.output.value))
}

三:md5

/*
 * 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;
}

md4算法

/*
 * a javascript implementation of the rsa data security, inc. md4 message
 * digest algorithm, as defined in rfc 1320.
 * version 2.1 copyright (c) jerrad pierce, 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
 */
function hex_md4(s){ return binl2hex(core_md4(str2binl(s), s.length * chrsz));}
function b64_md4(s){ return binl2b64(core_md4(str2binl(s), s.length * chrsz));}
function str_md4(s){ return binl2str(core_md4(str2binl(s), s.length * chrsz));}
function hex_hmac_md4(key, data) { return binl2hex(core_hmac_md4(key, data)); }
function b64_hmac_md4(key, data) { return binl2b64(core_hmac_md4(key, data)); }
function str_hmac_md4(key, data) { return binl2str(core_hmac_md4(key, data)); }
/*
 * perform a simple self-test to see if the vm is working
 */
function md4_vm_test()
{
 return hex_md4("abc") == "a448017aaf21d8525fc10ae87aa6729d";
}
/*
 * calculate the md4 of an array of little-endian words, and a bit length
 */
function core_md4(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 = md4_ff(a, b, c, d, x[i+ 0], 3 );
  d = md4_ff(d, a, b, c, x[i+ 1], 7 );
  c = md4_ff(c, d, a, b, x[i+ 2], 11);
  b = md4_ff(b, c, d, a, x[i+ 3], 19);
  a = md4_ff(a, b, c, d, x[i+ 4], 3 );
  d = md4_ff(d, a, b, c, x[i+ 5], 7 );
  c = md4_ff(c, d, a, b, x[i+ 6], 11);
  b = md4_ff(b, c, d, a, x[i+ 7], 19);
  a = md4_ff(a, b, c, d, x[i+ 8], 3 );
  d = md4_ff(d, a, b, c, x[i+ 9], 7 );
  c = md4_ff(c, d, a, b, x[i+10], 11);
  b = md4_ff(b, c, d, a, x[i+11], 19);
  a = md4_ff(a, b, c, d, x[i+12], 3 );
  d = md4_ff(d, a, b, c, x[i+13], 7 );
  c = md4_ff(c, d, a, b, x[i+14], 11);
  b = md4_ff(b, c, d, a, x[i+15], 19);
  a = md4_gg(a, b, c, d, x[i+ 0], 3 );
  d = md4_gg(d, a, b, c, x[i+ 4], 5 );
  c = md4_gg(c, d, a, b, x[i+ 8], 9 );
  b = md4_gg(b, c, d, a, x[i+12], 13);
  a = md4_gg(a, b, c, d, x[i+ 1], 3 );
  d = md4_gg(d, a, b, c, x[i+ 5], 5 );
  c = md4_gg(c, d, a, b, x[i+ 9], 9 );
  b = md4_gg(b, c, d, a, x[i+13], 13);
  a = md4_gg(a, b, c, d, x[i+ 2], 3 );
  d = md4_gg(d, a, b, c, x[i+ 6], 5 );
  c = md4_gg(c, d, a, b, x[i+10], 9 );
  b = md4_gg(b, c, d, a, x[i+14], 13);
  a = md4_gg(a, b, c, d, x[i+ 3], 3 );
  d = md4_gg(d, a, b, c, x[i+ 7], 5 );
  c = md4_gg(c, d, a, b, x[i+11], 9 );
  b = md4_gg(b, c, d, a, x[i+15], 13);
  a = md4_hh(a, b, c, d, x[i+ 0], 3 );
  d = md4_hh(d, a, b, c, x[i+ 8], 9 );
  c = md4_hh(c, d, a, b, x[i+ 4], 11);
  b = md4_hh(b, c, d, a, x[i+12], 15);
  a = md4_hh(a, b, c, d, x[i+ 2], 3 );
  d = md4_hh(d, a, b, c, x[i+10], 9 );
  c = md4_hh(c, d, a, b, x[i+ 6], 11);
  b = md4_hh(b, c, d, a, x[i+14], 15);
  a = md4_hh(a, b, c, d, x[i+ 1], 3 );
  d = md4_hh(d, a, b, c, x[i+ 9], 9 );
  c = md4_hh(c, d, a, b, x[i+ 5], 11);
  b = md4_hh(b, c, d, a, x[i+13], 15);
  a = md4_hh(a, b, c, d, x[i+ 3], 3 );
  d = md4_hh(d, a, b, c, x[i+11], 9 );
  c = md4_hh(c, d, a, b, x[i+ 7], 11);
  b = md4_hh(b, c, d, a, x[i+15], 15);
  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 basic operation for each round of the
 * algorithm.
 */
function md4_cmn(q, a, b, x, s, t)
{
 return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
}
function md4_ff(a, b, c, d, x, s)
{
 return md4_cmn((b & c) | ((~b) & d), a, 0, x, s, 0);
}
function md4_gg(a, b, c, d, x, s)
{
 return md4_cmn((b & c) | (b & d) | (c & d), a, 0, x, s, 1518500249);
}
function md4_hh(a, b, c, d, x, s)
{
 return md4_cmn(b ^ c ^ d, a, 0, x, s, 1859775393);
}
/*
 * calculate the hmac-md4, of a key and some data
 */
function core_hmac_md4(key, data)
{
 var bkey = str2binl(key);
 if(bkey.length > 16) bkey = core_md4(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_md4(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
 return core_md4(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 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;
}

sha1算法

/*
 * a javascript implementation of the secure hash algorithm, sha-1, as defined
 * in fips pub 180-1
 * version 2.1a copyright paul johnston 2000 - 2002.
 * other contributors: greg holt, andrew kepert, ydnar, lostinet
 * distributed under the bsd license
 * see http://pajhome.org.uk/crypt/md5 for details.
 */
/*
 * 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_sha1(s){return binb2hex(core_sha1(str2binb(s),s.length * chrsz));}
function b64_sha1(s){return binb2b64(core_sha1(str2binb(s),s.length * chrsz));}
function str_sha1(s){return binb2str(core_sha1(str2binb(s),s.length * chrsz));}
function hex_hmac_sha1(key, data){ return binb2hex(core_hmac_sha1(key, data));}
function b64_hmac_sha1(key, data){ return binb2b64(core_hmac_sha1(key, data));}
function str_hmac_sha1(key, data){ return binb2str(core_hmac_sha1(key, data));}
/*
 * perform a simple self-test to see if the vm is working
 */
function sha1_vm_test()
{
 return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";
}
/*
 * calculate the sha-1 of an array of big-endian words, and a bit length
 */
function core_sha1(x, len)
{
 /* append padding */
 x[len >> 5] |= 0x80 << (24 - len % 32);
 x[((len + 64 >> 9) << 4) + 15] = len;
 var w = array(80);
 var a = 1732584193;
 var b = -271733879;
 var c = -1732584194;
 var d = 271733878;
 var e = -1009589776;
 for(var i = 0; i < x.length; i += 16)
 {
  var olda = a;
  var oldb = b;
  var oldc = c;
  var oldd = d;
  var olde = e;
  for(var j = 0; j < 80; j++)
  {
   if(j < 16) w[j] = x[i + j];
   else w[j] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);
   var t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)),
            safe_add(safe_add(e, w[j]), sha1_kt(j)));
   e = d;
   d = c;
   c = rol(b, 30);
   b = a;
   a = t;
  }
  a = safe_add(a, olda);
  b = safe_add(b, oldb);
  c = safe_add(c, oldc);
  d = safe_add(d, oldd);
  e = safe_add(e, olde);
 }
 return array(a, b, c, d, e);
}
/*
 * perform the appropriate triplet combination function for the current
 * iteration
 */
function sha1_ft(t, b, c, d)
{
 if(t < 20) return (b & c) | ((~b) & d);
 if(t < 40) return b ^ c ^ d;
 if(t < 60) return (b & c) | (b & d) | (c & d);
 return b ^ c ^ d;
}
/*
 * determine the appropriate additive constant for the current iteration
 */
function sha1_kt(t)
{
 return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 :
     (t < 60) ? -1894007588 : -899497514;
}
/*
 * calculate the hmac-sha1 of a key and some data
 */
function core_hmac_sha1(key, data)
{
 var bkey = str2binb(key);
 if(bkey.length > 16) bkey = core_sha1(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_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
 return core_sha1(opad.concat(hash), 512 + 160);
}
/*
 * 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));
}
/*
 * convert an 8-bit or 16-bit string to an array of big-endian words
 * in 8-bit function, characters >255 have their hi-byte silently ignored.
 */
function str2binb(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) << (32 - chrsz - i%32);
 return bin;
}
/*
 * convert an array of big-endian words to a string
 */
function binb2str(bin)
{
 var str = "";
 var mask = (1 << chrsz) - 1;
 for(var i = 0; i < bin.length * 32; i += chrsz)
  str += string.fromcharcode((bin[i>>5] >>> (32 - chrsz - i%32)) & mask);
 return str;
}
/*
 * convert an array of big-endian words to a hex string.
 */
function binb2hex(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] >> ((3 - i%4)*8+4)) & 0xf) +
      hex_tab.charat((binarray[i>>2] >> ((3 - i%4)*8 )) & 0xf);
 }
 return str;
}
/*
 * convert an array of big-endian words to a base-64 string
 */
function binb2b64(binarray)
{
 var tab = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/";
 var str = "";
 for(var i = 0; i < binarray.length * 4; i += 3)
 {
  var triplet = (((binarray[i  >> 2] >> 8 * (3 - i  %4)) & 0xff) << 16)
        | (((binarray[i+1 >> 2] >> 8 * (3 - (i+1)%4)) & 0xff) << 8 )
        | ((binarray[i+2 >> 2] >> 8 * (3 - (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;
}

ps:关于加密解密感兴趣的朋友还可以参考本站在线工具:

base64编码解码工具:

url网址16进制加密工具:

密码安全性在线检测:

高强度密码生成器:
http://tools.jb51.net/password/createstrongpassword

md5在线加密工具:
http://tools.jb51.net/password/createmd5password

迅雷、快车、旋风url加密/解密工具:

在线散列/哈希算法加密工具:

更多关于javascript相关内容可查看本站专题:《javascript加密解密技巧汇总》、《javascript切换特效与技巧总结》、《javascript查找算法技巧总结》、《javascript动画特效与技巧汇总》、《javascript错误与调试技巧总结》、《javascript数据结构与算法技巧总结》、《javascript遍历算法与技巧总结》及《javascript数学运算用法总结

希望本文所述对大家javascript程序设计有所帮助。