PHP

// Encryption Function
function inacbg_encrypt($data, $key) {
    /// make binary representation of $key
    $key = hex2bin($key);
    /// check key length, must be 256 bit or 32 bytes
    if (mb_strlen($key, "8bit") !== 32) {
        throw new Exception("Needs a 256-bit key!");
    }
    /// create initialization vector
    $iv_size = openssl_cipher_iv_length("aes-256-cbc");
    $iv = openssl_random_pseudo_bytes($iv_size); // dengan catatan dibawah
    /// encrypt
    $encrypted = openssl_encrypt($data, "aes-256-cbc", $key, OPENSSL_RAW_DATA, $iv);
    /// create signature, against padding oracle attacks
    $signature = mb_substr(hash_hmac("sha256", $encrypted, $key, true), 0, 10, "8bit");
    /// combine all, encode, and format
    $encoded = chunk_split(base64_encode($signature . $iv . $encrypted));
    return $encoded;
}

// Decryption Function
function inacbg_decrypt($str, $strkey) {
    /// make binary representation of $key
    $key = hex2bin($strkey);
    /// check key length, must be 256 bit or 32 bytes
    if (mb_strlen($key, "8bit") !== 32) {
        throw new Exception("Needs a 256-bit key!");
    }
    /// calculate iv size
    $iv_size = openssl_cipher_iv_length("aes-256-cbc");
    /// breakdown parts
    $decoded = base64_decode($str);
    $signature = mb_substr($decoded, 0, 10, "8bit");
    $iv = mb_substr($decoded, 10, $iv_size, "8bit");
    $encrypted = mb_substr($decoded, $iv_size + 10, NULL, "8bit");
    /// check signature, against padding oracle attack
    $calc_signature = mb_substr(hash_hmac("sha256", $encrypted, $key, true), 0, 10, "8bit");
    if (!inacbg_compare($signature, $calc_signature)) {
        return "SIGNATURE_NOT_MATCH"; /// signature doesn't match
    }
    $decrypted = openssl_decrypt($encrypted, "aes-256-cbc", $key, OPENSSL_RAW_DATA, $iv);
    return $decrypted;
}

/// Compare Function
function inacbg_compare($a, $b) {
    /// compare individually to prevent timing attacks
    /// compare length
    if (strlen($a) !== strlen($b)) return false;
    /// compare individual
    $result = 0;
    for ($i = 0; $i < strlen($a); $i++) {
        $result |= ord($a[$i]) ^ ord($b[$i]);
    }
    return $result == 0;
}