Online PHP editor | output for 9PN2m

<?php $string='test data'; $output = ''; $encrypt_method = 'AES-256-CTR'; $key = random_bytes(32); // Store long-term $secret_iv = random_bytes(16); $encryption_key = hash_hkdf('sha256', $key, 32, 'encryption'); $authentication_key = hash_hkdf('sha256', $key, 32, 'authentication'); $unauthenticated = openssl_encrypt( $string, $encrypt_method, $encryption_key, OPENSSL_RAW_DATA, $secret_iv ); // NEW: Add an HMAC $hmac = hash_hmac('sha256', $secret_iv . $unauthenticated, $authentication_key, true); $output = base64_encode($hmac . $secret_iv . $unauthenticated); var_dump($output);