Online PHP editor | output for bdQe9

<?php function pkcs7_pad($str) { $len = mb_strlen($str, '8bit'); $c = 16 - ($len % 16); $str .= str_repeat(chr($c), $c); return $str; } $message = 'test'; $key = openssl_random_pseudo_bytes(16); $iv = openssl_random_pseudo_bytes(16); $cipher = mcrypt_encrypt( MCRYPT_RIJNDAEL_128, $key, pkcs7_pad($message), MCRYPT_MODE_CBC, $iv ); $plain = openssl_decrypt( $cipher, 'aes-128-cbc', $key, OPENSSL_RAW_DATA, $iv ); var_dump( $message, bin2hex($cipher), $plain, mb_strlen($message, '8bit'), mb_strlen($plain, '8bit'), $message === $plain );