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<?php /** * A cryptographic random generator class used for generating secret keys * * This is based in part on Drupal code as well as what we used in our own code * prior to introduction of this class. * * This program 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 2 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 General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @author Daniel Friesen * @file */ class MWCryptRand { /** * Generate a run of cryptographically random data and return * it in hexadecimal string format. * * @param int $chars The number of hex chars of random data to generate * @return string Hexadecimal random data */ public static function generateHex( $chars ) { // hex strings are 2x the length of raw binary so we divide the length in half // odd numbers will result in a .5 that leads the generate() being 1 character // short, so we use ceil() to ensure that we always have enough bytes $bytes = ceil( $chars / 2 ); // Generate the data and then convert it to a hex string $hex = bin2hex( random_bytes( $bytes ) ); // A bit of paranoia here, the caller asked for a specific length of string // here, and it's possible (eg when given an odd number) that we may actually // have at least 1 char more than they asked for. Just in case they made this // call intending to insert it into a database that does truncation we don't // want to give them too much and end up with their database and their live // code having two different values because part of what we gave them is truncated // hence, we strip out any run of characters longer than what we were asked for. return substr( $hex, 0, $chars ); } }
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