xmppjs: comparison sha1.js

comparison: sha1.js

sha1.js

changeset 0: 0da83180e975

equal deleted inserted replaced

--1:000000000000
+:0da83180e975
+/*
+* 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
+* Modifications by Matthew Wild to export functions for CommonJS
+* 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
+*/
+exports.hex = function (s){return binb2hex(core_sha1(str2binb(s),s.length * chrsz));}
+exports.b64 = function (s){return binb2b64(core_sha1(str2binb(s),s.length * chrsz));}
+exports.str = function (s){return binb2str(core_sha1(str2binb(s),s.length * chrsz));}
+exports.hex_hmac = function (key, data){ return binb2hex(core_hmac_sha1(key, data));}
+exports.b64_hmac = function (key, data){ return binb2b64(core_hmac_sha1(key, data));}
+exports.str_hmac = function (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 = 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 * chrsz); }
+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 * 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 = [];
+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 = "";
+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 += b64pad; }
+else { str += tab.charAt((triplet >> 6*(3-j)) & 0x3F); }
+}
+}
+return str;
+}