semantic_search/js/sha1.js

/*
 * 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;
}
1	/*
2	* A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
3	* in FIPS PUB 180-1
4	* Version 2.1a 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)),
66	safe_add(safe_add(e, w[j]), sha1_kt(j)));
67	e = d;
68	d = c;
69	c = rol(b, 30);
70	b = a;
71	a = t;
72	}
73
74	a = safe_add(a, olda);
75	b = safe_add(b, oldb);
76	c = safe_add(c, oldc);
77	d = safe_add(d, oldd);
78	e = safe_add(e, olde);
79	}
80	return Array(a, b, c, d, e);
81
82	}
83
84	/*
85	* Perform the appropriate triplet combination function for the current
86	* iteration
87	*/
88	function sha1_ft(t, b, c, d)
89	{
90	if(t < 20) return (b & c) \| ((~b) & d);
91	if(t < 40) return b ^ c ^ d;
92	if(t < 60) return (b & c) \| (b & d) \| (c & d);
93	return b ^ c ^ d;
94	}
95
96	/*
97	* Determine the appropriate additive constant for the current iteration
98	*/
99	function sha1_kt(t)
100	{
101	return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 :
102	(t < 60) ? -1894007588 : -899497514;
103	}
104
105	/*
106	* Calculate the HMAC-SHA1 of a key and some data
107	*/
108	function core_hmac_sha1(key, data)
109	{
110	var bkey = str2binb(key);
111	if(bkey.length > 16) bkey = core_sha1(bkey, key.length * chrsz);
112
113	var ipad = Array(16), opad = Array(16);
114	for(var i = 0; i < 16; i++)
115	{
116	ipad[i] = bkey[i] ^ 0x36363636;
117	opad[i] = bkey[i] ^ 0x5C5C5C5C;
118	}
119
120	var hash = core_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
121	return core_sha1(opad.concat(hash), 512 + 160);
122	}
123
124	/*
125	* Add integers, wrapping at 2^32. This uses 16-bit operations internally
126	* to work around bugs in some JS interpreters.
127	*/
128	function safe_add(x, y)
129	{
130	var lsw = (x & 0xFFFF) + (y & 0xFFFF);
131	var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
132	return (msw << 16) \| (lsw & 0xFFFF);
133	}
134
135	/*
136	* Bitwise rotate a 32-bit number to the left.
137	*/
138	function rol(num, cnt)
139	{
140	return (num << cnt) \| (num >>> (32 - cnt));
141	}
142
143	/*
144	* Convert an 8-bit or 16-bit string to an array of big-endian words
145	* In 8-bit function, characters >255 have their hi-byte silently ignored.
146	*/
147	function str2binb(str)
148	{
149	var bin = Array();
150	var mask = (1 << chrsz) - 1;
151	for(var i = 0; i < str.length * chrsz; i += chrsz)
152	bin[i>>5] \|= (str.charCodeAt(i / chrsz) & mask) << (32 - chrsz - i%32);
153	return bin;
154	}
155
156	/*
157	* Convert an array of big-endian words to a string
158	*/
159	function binb2str(bin)
160	{
161	var str = "";
162	var mask = (1 << chrsz) - 1;
163	for(var i = 0; i < bin.length * 32; i += chrsz)
164	str += String.fromCharCode((bin[i>>5] >>> (32 - chrsz - i%32)) & mask);
165	return str;
166	}
167
168	/*
169	* Convert an array of big-endian words to a hex string.
170	*/
171	function binb2hex(binarray)
172	{
173	var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
174	var str = "";
175	for(var i = 0; i < binarray.length * 4; i++)
176	{
177	str += hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8+4)) & 0xF) +
178	hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8 )) & 0xF);
179	}
180	return str;
181	}
182
183	/*
184	* Convert an array of big-endian words to a base-64 string
185	*/
186	function binb2b64(binarray)
187	{
188	var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
189	var str = "";
190	for(var i = 0; i < binarray.length * 4; i += 3)
191	{
192	var triplet = (((binarray[i >> 2] >> 8 * (3 - i %4)) & 0xFF) << 16)
193	\| (((binarray[i+1 >> 2] >> 8 * (3 - (i+1)%4)) & 0xFF) << 8 )
194	\| ((binarray[i+2 >> 2] >> 8 * (3 - (i+2)%4)) & 0xFF);
195	for(var j = 0; j < 4; j++)
196	{
197	if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
198	else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
199	}
200	}
201	return str;
202	}