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<?php
namespace PhpZip\Util;
use PhpZip\Exception\RuntimeException;
/**
* Crypto Utils
*/
class CryptoUtil
{
/**
* Returns random bytes.
*
* @param int $length
* @return string
* @throws RuntimeException
*/
final public static function randomBytes($length)
{
$length = (int)$length;
if (function_exists('random_bytes')) {
return random_bytes($length);
} elseif (function_exists('openssl_random_pseudo_bytes')) {
return openssl_random_pseudo_bytes($length);
} elseif (function_exists('mcrypt_create_iv')) {
return mcrypt_create_iv($length);
} else {
throw new RuntimeException('Extension openssl or mcrypt not loaded');
}
}
}
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