/*

* A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined

* in FIPS 180-1

* Version 2.2 Copyright Paul Johnston 2000 - 2009.

* 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 */

/*

* 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 rstr2hex(rstr_sha1(str2rstr_utf8(s))); }

function b64_sha1(s) { return rstr2b64(rstr_sha1(str2rstr_utf8(s))); }

function any_sha1(s, e) { return rstr2any(rstr_sha1(str2rstr_utf8(s)), e); }

function hex_hmac_sha1(k, d)

{ return rstr2hex(rstr_hmac_sha1(str2rstr_utf8(k), str2rstr_utf8(d))); }

function b64_hmac_sha1(k, d)

{ return rstr2b64(rstr_hmac_sha1(str2rstr_utf8(k), str2rstr_utf8(d))); }

function any_hmac_sha1(k, d, e)

{ return rstr2any(rstr_hmac_sha1(str2rstr_utf8(k), str2rstr_utf8(d)), e); }

/*

* Perform a simple self-test to see if the VM is working

*/

function sha1_vm_test()

{

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

}

/*

* Calculate the SHA1 of a raw string

*/

function rstr_sha1(s)

{

return binb2rstr(binb_sha1(rstr2binb(s), s.length * 8));

}

/*

* Calculate the HMAC-SHA1 of a key and some data (raw strings)

*/

function rstr_hmac_sha1(key, data)

{

var bkey = rstr2binb(key);

if(bkey.length > 16) bkey = binb_sha1(bkey, key.length * 8);

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 = binb_sha1(ipad.concat(rstr2binb(data)), 512 + data.length * 8);

return binb2rstr(binb_sha1(opad.concat(hash), 512 + 160));

}

/*

* Convert a raw string to a hex string

*/

function rstr2hex(input)

{

try { hexcase } catch(e) { hexcase=0; }

var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";

var output = "";

var x;

for(var i = 0; i < input.length; i++)

{

x = input.charCodeAt(i);

output += hex_tab.charAt((x >>> 4) & 0x0F)

+ hex_tab.charAt( x & 0x0F);

}

return output;

}

/*

* Convert a raw string to a base-64 string

*/

function rstr2b64(input)

{

try { b64pad } catch(e) { b64pad=''; }

var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

var output = "";

var len = input.length;

for(var i = 0; i < len; i += 3)

{

var triplet = (input.charCodeAt(i) << 16)

| (i + 1 < len ? input.charCodeAt(i+1) << 8 : 0)

| (i + 2 < len ? input.charCodeAt(i+2) : 0);

for(var j = 0; j < 4; j++)

{

if(i * 8 + j * 6 > input.length * 8) output += b64pad;

else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F);

}

}

return output;

}

/*

* Convert a raw string to an arbitrary string encoding

*/

function rstr2any(input, encoding)

{

var divisor = encoding.length;

var remainders = Array();

var i, q, x, quotient;

/* Convert to an array of 16-bit big-endian values, forming the dividend */

var dividend = Array(Math.ceil(input.length / 2));

for(i = 0; i < dividend.length; i++)

{

dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1);

}

/*

* Repeatedly perform a long division. The binary array forms the dividend,

* the length of the encoding is the divisor. Once computed, the quotient

* forms the dividend for the next step. We stop when the dividend is zero.

* All remainders are stored for later use.

*/

while(dividend.length > 0)

{

quotient = Array();

x = 0;

for(i = 0; i < dividend.length; i++)

{

x = (x << 16) + dividend[i];

q = Math.floor(x / divisor);

x -= q * divisor;

if(quotient.length > 0 || q > 0)

quotient[quotient.length] = q;

}

remainders[remainders.length] = x;

dividend = quotient;

}

/* Convert the remainders to the output string */

var output = "";

for(i = remainders.length - 1; i >= 0; i--)

output += encoding.charAt(remainders[i]);

/* Append leading zero equivalents */

var full_length = Math.ceil(input.length * 8 /

(Math.log(encoding.length) / Math.log(2)))

for(i = output.length; i < full_length; i++)

output = encoding[0] + output;

return output;

}

/*

* Encode a string as utf-8.

* For efficiency, this assumes the input is valid utf-16.

*/

function str2rstr_utf8(input)

{

var output = "";

var i = -1;

var x, y;

while(++i < input.length)

{

/* Decode utf-16 surrogate pairs */

x = input.charCodeAt(i);

y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0;

if(0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF)

{

x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);

i++;

}

/* Encode output as utf-8 */

if(x <= 0x7F)

output += String.fromCharCode(x);

else if(x <= 0x7FF)

output += String.fromCharCode(0xC0 | ((x >>> 6 ) & 0x1F),

0x80 | ( x & 0x3F));

else if(x <= 0xFFFF)

output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F),

0x80 | ((x >>> 6 ) & 0x3F),

0x80 | ( x & 0x3F));

else if(x <= 0x1FFFFF)

output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07),

0x80 | ((x >>> 12) & 0x3F),

0x80 | ((x >>> 6 ) & 0x3F),

0x80 | ( x & 0x3F));

}

return output;

}

/*

* Encode a string as utf-16

*/

function str2rstr_utf16le(input)

{

var output = "";

for(var i = 0; i < input.length; i++)

output += String.fromCharCode( input.charCodeAt(i) & 0xFF,

(input.charCodeAt(i) >>> 8) & 0xFF);

return output;

}

function str2rstr_utf16be(input)

{

var output = "";

for(var i = 0; i < input.length; i++)

output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF,

input.charCodeAt(i) & 0xFF);

return output;

}

/*

* Convert a raw string to an array of big-endian words

* Characters >255 have their high-byte silently ignored.

*/

function rstr2binb(input)

{

var output = Array(input.length >> 2);

for(var i = 0; i < output.length; i++)

output[i] = 0;

for(var i = 0; i < input.length * 8; i += 8)

output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (24 - i % 32);

return output;

}

/*

* Convert an array of big-endian words to a string

*/

function binb2rstr(input)

{

var output = "";

for(var i = 0; i < input.length * 32; i += 8)

output += String.fromCharCode((input[i>>5] >>> (24 - i % 32)) & 0xFF);

return output;

}

/*

* Calculate the SHA-1 of an array of big-endian words, and a bit length

*/

function binb_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] = bit_rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);

var t = safe_add(safe_add(bit_rol(a, 5), sha1_ft(j, b, c, d)),

safe_add(safe_add(e, w[j]), sha1_kt(j)));

e = d;

d = c;

c = bit_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;

}

/*

* 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));

}