strophe.js
Version:
Strophe.js is an XMPP library for JavaScript
173 lines (153 loc) • 4.99 kB
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.
*/
/* global define */
/* Some functions and variables have been stripped for use with Strophe */
/*
* 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 = new Array(80);
var a = 1732584193;
var b = -271733879;
var c = -1732584194;
var d = 271733878;
var e = -1009589776;
var i, j, t, olda, oldb, oldc, oldd, olde;
for (i = 0; i < x.length; i += 16) {
olda = a;
oldb = b;
oldc = c;
oldd = d;
olde = e;
for (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);
}
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 [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 * 8);
}
var ipad = new Array(16), opad = new 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 * 8);
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 = [];
var mask = 255;
for (var i = 0; i < str.length * 8; i += 8) {
bin[i>>5] |= (str.charCodeAt(i / 8) & mask) << (24 - i%32);
}
return bin;
}
/*
* Convert an array of big-endian words to a base-64 string
*/
function binb2b64 (binarray) {
var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var str = "";
var triplet, j;
for (var i = 0; i < binarray.length * 4; i += 3) {
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 (j = 0; j < 4; j++) {
if (i * 8 + j * 6 > binarray.length * 32) { str += "="; }
else { str += tab.charAt((triplet >> 6*(3-j)) & 0x3F); }
}
}
return str;
}
/*
* Convert an array of big-endian words to a string
*/
function binb2str(bin) {
var str = "";
var mask = 255;
for (var i = 0; i < bin.length * 32; i += 8) {
str += String.fromCharCode((bin[i>>5] >>> (24 - i%32)) & mask);
}
return str;
}
/*
* These are the functions you'll usually want to call
* They take string arguments and return either hex or base-64 encoded strings
*/
const SHA1 = {
b64_hmac_sha1: function (key, data){ return binb2b64(core_hmac_sha1(key, data)); },
b64_sha1: function (s) { return binb2b64(core_sha1(str2binb(s),s.length * 8)); },
binb2str: binb2str,
core_hmac_sha1: core_hmac_sha1,
str_hmac_sha1: function (key, data){ return binb2str(core_hmac_sha1(key, data)); },
str_sha1: function (s) { return binb2str(core_sha1(str2binb(s),s.length * 8)); },
};
export { SHA1 as default };