function str_random($length = 16)
{
$string = '';
while (($len = strlen($string)) < $length) {
$size = $length - $len;
$bytes = randomBytes($size);
$string .= substr(str_replace(array('/', '+', '='), '', base64_encode($bytes)), 0, $size);
}
return $string;
}
function simplifiedInitialStep()
{
// 8 random bytes for an initial hash
$S = randomBytes(64);
$hash = __otp_hash(hash_wrapper($S));
return $S;
}
function randomBooleanArray($numBits)
{
$bytesString = randomBytes($numBits);
$hexString = bin2Hex($bytesString);
$booleanArray = hexString_2_booleanArray($hexString);
return array_slice($booleanArray, 0, $numBits);
}
<?php /* Secure PHP random bytes by @shoghicp This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ include "randomBytes.php"; $start = microtime(true); echo "Stream: " . randomBytes(32, true, false, "", $rounds, $drop) . PHP_EOL; //This will return an output of 32 bytes hex-encoded, and using secure reconbination of data. echo "Elapsed: " . round(microtime(true) - $start, 4) . " seconds" . PHP_EOL; echo "Rounds: " . $rounds . PHP_EOL; echo "Dropped bits: " . $drop . PHP_EOL;
function testRandom1024BytesAreRandom()
{
$NUM_TESTS = 100;
$NUM_BITS = 8192;
$randoms = array();
for ($i = 0; $i < $NUM_TESTS; ++$i) {
$randoms[] = randomBytes($NUM_BITS);
}
$randoms_uniq = array_unique($randoms);
$this->assertTrue(count($randoms) == count($randoms_uniq), "Randoms array count (" . count($randoms) . ") should be equal to randoms_uniq array count (" . count($randoms_uniq) . ").");
}