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  1. /*
  2.  * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
  3.  * in FIPS PUB 180-1
  4.  * Version 2.1 Copyright Paul Johnston 2000 - 2002.
  5.  * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
  6.  * Distributed under the BSD License
  7.  * See http://pajhome.org.uk/crypt/md5 for details.
  8.  */
  9.  
  10. /*
  11.  * Configurable variables. You may need to tweak these to be compatible with
  12.  * the server-side, but the defaults work in most cases.
  13.  */
  14. var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */
  15. var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */
  16. var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */
  17.  
  18. /*
  19.  * These are the functions you'll usually want to call
  20.  * They take string arguments and return either hex or base-64 encoded strings
  21.  */
  22. function hex_sha1(s){return binb2hex(core_sha1(str2binb(s),s.length * chrsz));}
  23. function b64_sha1(s){return binb2b64(core_sha1(str2binb(s),s.length * chrsz));}
  24. function str_sha1(s){return binb2str(core_sha1(str2binb(s),s.length * chrsz));}
  25. function hex_hmac_sha1(key, data){ return binb2hex(core_hmac_sha1(key, data));}
  26. function b64_hmac_sha1(key, data){ return binb2b64(core_hmac_sha1(key, data));}
  27. function str_hmac_sha1(key, data){ return binb2str(core_hmac_sha1(key, data));}
  28.  
  29. /*
  30.  * Perform a simple self-test to see if the VM is working
  31.  */
  32. function sha1_vm_test()
  33. {
  34.         return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";
  35. }
  36.  
  37. /*
  38.  * Calculate the SHA-1 of an array of big-endian words, and a bit length
  39.  */
  40. function core_sha1(x, len)
  41. {
  42.         /* append padding */
  43.         x[len >> 5] |= 0x80 << (24 - len % 32);
  44.         x[((len + 64 >> 9) << 4) + 15] = len;
  45.  
  46.         var w = Array(80);
  47.         var a =  1732584193;
  48.         var b = -271733879;
  49.         var c = -1732584194;
  50.         var d =  271733878;
  51.         var e = -1009589776;
  52.  
  53.         for (var i = 0; i < x.length; i += 16)
  54.         {
  55.                 var olda = a;
  56.                 var oldb = b;
  57.                 var oldc = c;
  58.                 var oldd = d;
  59.                 var olde = e;
  60.  
  61.                 for (var j = 0; j < 80; j++)
  62.                 {
  63.                         if (j < 16) w[j] = x[i + j];
  64.                         else w[j] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);
  65.                         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)));
  66.                         e = d;
  67.                         d = c;
  68.                         c = rol(b, 30);
  69.                         b = a;
  70.                         a = t;
  71.                 }
  72.  
  73.                 a = safe_add(a, olda);
  74.                 b = safe_add(b, oldb);
  75.                 c = safe_add(c, oldc);
  76.                 d = safe_add(d, oldd);
  77.                 e = safe_add(e, olde);
  78.         }
  79.         return Array(a, b, c, d, e);
  80. }
  81.  
  82. /*
  83.  * Perform the appropriate triplet combination function for the current
  84.  * iteration
  85.  */
  86. function sha1_ft(t, b, c, d)
  87. {
  88.         if (t < 20) return (b & c) | ((~b) & d);
  89.         if (t < 40) return b ^ c ^ d;
  90.         if (t < 60) return (b & c) | (b & d) | (c & d);
  91.         return b ^ c ^ d;
  92. }
  93.  
  94. /*
  95.  * Determine the appropriate additive constant for the current iteration
  96.  */
  97. function sha1_kt(t)
  98. {
  99.         return  (t < 20) ?  1518500249 : (t < 40) ? 1859775393 :
  100.                         (t < 60) ? -1894007588 : -899497514;
  101. }
  102.  
  103. /*
  104.  * Calculate the HMAC-SHA1 of a key and some data
  105.  */
  106. function core_hmac_sha1(key, data)
  107. {
  108.         var bkey = str2binb(key);
  109.         if (bkey.length > 16) bkey = core_sha1(bkey, key.length * chrsz);
  110.  
  111.         var ipad = Array(16), opad = Array(16);
  112.         for (var i = 0; i < 16; i++)
  113.         {
  114.                 ipad[i] = bkey[i] ^ 0x36363636;
  115.                 opad[i] = bkey[i] ^ 0x5C5C5C5C;
  116.         }
  117.  
  118.         var hash = core_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
  119.         return core_sha1(opad.concat(hash), 512 + 160);
  120. }
  121.  
  122. /*
  123.  * Add integers, wrapping at 2^32. This uses 16-bit operations internally
  124.  * to work around bugs in some JS interpreters.
  125.  */
  126. function safe_add(x, y)
  127. {
  128.         var lsw = (x & 0xFFFF) + (y & 0xFFFF);
  129.         var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  130.         return (msw << 16) | (lsw & 0xFFFF);
  131. }
  132.  
  133. /*
  134.  * Bitwise rotate a 32-bit number to the left.
  135.  */
  136. function rol(num, cnt)
  137. {
  138.         return (num << cnt) | (num >>> (32 - cnt));
  139. }
  140.  
  141. /*
  142.  * Convert an 8-bit or 16-bit string to an array of big-endian words
  143.  * In 8-bit function, characters >255 have their hi-byte silently ignored.
  144.  */
  145. function str2binb(str)
  146. {
  147.         var bin = Array();
  148.  
  149.         for (var i = 0, n = 1 + ((str.length * chrsz) >> 5); i < n; i++)
  150.                 bin[i] = 0;
  151.  
  152.         var mask = (1 << chrsz) - 1;
  153.         for (var i = 0; i < str.length * chrsz; i += chrsz)
  154.                 bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - i % 32);
  155.         return bin;
  156. }
  157.  
  158. /*
  159.  * Convert an array of big-endian words to a string
  160.  */
  161. function binb2str(bin)
  162. {
  163.         var str = "";
  164.         var mask = (1 << chrsz) - 1;
  165.         for (var i = 0; i < bin.length * 32; i += chrsz)
  166.                 str += String.fromCharCode((bin[i>>5] >>> (24 - i%32)) & mask);
  167.         return str;
  168. }
  169.  
  170. /*
  171.  * Convert an array of big-endian words to a hex string.
  172.  */
  173. function binb2hex(binarray)
  174. {
  175.         var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
  176.         var str = "";
  177.         for (var i = 0; i < binarray.length * 4; i++)
  178.         {
  179.                 str += hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8+4)) & 0xF) +
  180.                            hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8  )) & 0xF);
  181.         }
  182.         return str;
  183. }
  184.  
  185. /*
  186.  * Convert an array of big-endian words to a base-64 string
  187.  */
  188. function binb2b64(binarray)
  189. {
  190.         var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  191.         var str = "";
  192.         for (var i = 0; i < binarray.length * 4; i += 3)
  193.         {
  194.                 var triplet = (((binarray[i   >> 2] >> 8 * (3 -  i   %4)) & 0xFF) << 16)
  195.                                         | (((binarray[i+1 >> 2] >> 8 * (3 - (i+1)%4)) & 0xFF) << 8 )
  196.                                         |  ((binarray[i+2 >> 2] >> 8 * (3 - (i+2)%4)) & 0xFF);
  197.                 for (var j = 0; j < 4; j++)
  198.                 {
  199.                         if (i * 8 + j * 6 > binarray.length * 32) str += b64pad;
  200.                         else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
  201.                 }
  202.         }
  203.         return str;
  204. }
  205.  
  206.