/**
* Generate a random string of the specified size
*
* @param int $size The size of the requested random string
*
* @return string A string of the requested size
*/
public function generate($size)
{
$result = '';
while (Util::safeStrlen($result) < $size) {
$result = uniqid($result, true);
}
return Util::safeSubstr($result, 0, $size);
}
/**
* Generate a random string of the specified size
*
* @param int $size The size of the requested random string
*
* @return string A string of the requested size
*/
public function generate($size)
{
$result = '';
$seed = microtime() . memory_get_usage();
self::$state = hash('sha512', self::$state . $seed, true);
/**
* Make the generated randomness a bit better by forcing a GC run which
* should complete in a indeterminate amount of time, hence improving
* the strength of the randomness a bit. It's still not crypto-safe,
* but at least it's more difficult to predict.
*/
gc_collect_cycles();
for ($i = 0; $i < $size; $i += 8) {
$seed = self::$state . microtime() . pack('Ni', $i, self::counter());
self::$state = hash('sha512', $seed, true);
/**
* We only use the first 8 bytes here to prevent exposing the state
* in its entirety, which could potentially expose other random
* generations in the future (in the same process)...
*/
$result .= Util::safeSubstr(self::$state, 0, 8);
}
return Util::safeSubstr($result, 0, $size);
}
/**
* Get the block size (the size of the individual blocks used for the mixing)
*
* @return int The block size
*/
protected function getPartSize()
{
return Util::safeStrlen(hash($this->hash, '', true));
}
private function str_split($string, $size)
{
$blocks = array();
$length = Util::safeStrlen($string);
$parts = ceil($length / $size);
for ($i = 0; $i < $parts; $i++) {
$blocks[] = Util::safeSubstr($string, $i * $length, $length);
}
return $blocks;
}