JavaScript DHTML/Security/SHA 1

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SHA-1 Crypt

   <source lang="html4strict">

<html> 

 <head>
   
   <title>SHA-1 Crypt</title>
 </head>
 <body>
     
   <script language="JavaScript">

/* 

* A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
* in FIPS PUB 180-1
* Version 2.1 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.
*/

var hexcase = 0; var b64pad = ""; var chrsz = 8; 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));} function sha1_vm_test() { 

 return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";

} function core_sha1(x, len) { 

 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);

} 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;

} function sha1_kt(t) { 

 return (t < 20) ?  1518500249 : (t < 40) ?  1859775393 :
        (t < 60) ? -1894007588 : -899497514;

} 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);

} 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 rol(num, cnt) { 

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

} 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) << (24 - i%32);
 return bin;

} 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] >>> (24 - i%32)) & mask);
 return str;

} 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;

} 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;

} 

   </script>
   <form>
     Input
     <input type=text name=input size=40>

     Result
     <input type=text name=hash size=50>

     <input type=button value="SHA-1 It!" onclick="hash.value = hex_sha1(input.value)">
   </form>
 </body>

</html> 

      </source>
Источник — «http://wbex.ru/index.php?title=JavaScript_DHTML/Security/SHA_1&oldid=3687»