gPass/server/ressources/pkdbf2.js

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/*
Copyright (C) 2013 Grégory Soutadé
This file is part of gPass.
gPass is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
gPass is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with gPass. If not, see <http://www.gnu.org/licenses/>.
*/
// http://stackoverflow.com/questions/3745666/how-to-convert-from-hex-to-ascii-in-javascript
function hex2a(hex) {
var str = '';
for (var i = 0; i < hex.length; i += 2)
str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
return str;
}
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function pkdbf2 (password, salt, iterations, outlen) {
var result = "";
var temp = "";
var temp2 = "";
var temp_res = "";
var temp_res2 = "";
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for (i=1; result.length < outlen; i++)
{
temp = hex2a(hmac256(salt +
String.fromCharCode((i & 0xff000000) >> 24) +
String.fromCharCode((i & 0x00ff0000) >> 16) +
String.fromCharCode((i & 0x0000ff00) >> 8) +
String.fromCharCode((i & 0x000000ff) >> 0),
password));
temp_res = temp;
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for(a=1; a<iterations; a++)
{
temp2 = hex2a(hmac256(temp, password));
temp_res2 = "";
for(b = 0; b<temp_res.length; b++)
temp_res2 += String.fromCharCode(temp_res.charCodeAt(b) ^ temp2.charCodeAt(b));
temp_res = temp_res2;
temp = temp2;
}
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result += temp_res;
}
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return result.substr(0, outlen);
}