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<?php
/**
* Nextcloud - user_sql
*
* @copyright 2018 Marcin Łojewski <dev@mlojewski.me>
* @author Marcin Łojewski <dev@mlojewski.me>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
namespace OCA\UserSQL\Crypto;
/**
* Cryptographic utilities.
*
* @author Marcin Łojewski <dev@mlojewski.me>
*/
final class Utils
{
/**
* Convert hexadecimal message to its base64 form.
*
* @param $hex string The hexadecimal encoded message.
*
* @return string The same message encoded in base64.
*/
public static function hexToBase64($hex)
{
$hexChr = "";
foreach (str_split($hex, 2) as $hexPair) {
$hexChr .= chr(hexdec($hexPair));
}
return base64_encode($hexChr);
}
/**
* Generate random string from given alphabet.
*
* @param $length int The output string length.
* @param $alphabet string The output string alphabet.
*
* @return string Random string from given alphabet.
*/
public static function randomString($length, $alphabet)
{
$string = "";
for ($idx = 0; $idx != $length; ++$idx) {
$string .= $alphabet[random_int(0, strlen($alphabet) - 1)];
}
return $string;
}
}
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