210 lines
5.6 KiB
JavaScript
210 lines
5.6 KiB
JavaScript
/*
|
|
* 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.
|
|
*/
|
|
|
|
exports.hex_sha1 = hex_sha1;
|
|
exports.b64_sha1 = b64_sha1;
|
|
exports.str_sha1 = str_sha1;
|
|
exports.hex_hmac_sha1 = hex_hmac_sha1;
|
|
exports.b64_hmac_sha1 = b64_hmac_sha1;
|
|
exports.str_hmac_sha1 = str_hmac_sha1;
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|