encrypt and decrypt

crypt.php

<?php

class MBM_Encrypt_Decrypt {
    const ENCRYPT_METHOD = 'AES-256-CBC'; // type of encryption
    const SECRET_KEY = 'rappier_simple_secret_key'; // secret key
    const SECRET_IV = 'rappier_simple_secret_iv'; // secret iv

    public function encrypt($string) {
        return $this->encrypt_decrypt('encrypt', $string);
    }

    public function decrypt($string) {
        return $this->encrypt_decrypt('decrypt', $string);
    }
    private function encrypt_decrypt($action, $string)
    {
        $key = hash('sha256', self::SECRET_KEY, true);
        $iv = substr(hash('sha256', self::SECRET_IV, true), 0, 16);
        if ($action == 'encrypt') {
            $output = openssl_encrypt($string, self::ENCRYPT_METHOD, $key, 0, $iv);
        } else if ($action == 'decrypt') {
            $output = openssl_decrypt($string, self::ENCRYPT_METHOD, $key, 0, $iv);
        }
        $output = (!empty($output)) ? $output : false;
        return $output;
    }
}


$class_encrypt = new MBM_Encrypt_Decrypt();

$plain_txt = "ajitem";
echo 'Plain Text: ' . $plain_txt . PHP_EOL;

$encrypted_txt = $class_encrypt->encrypt($plain_txt);
echo 'Ciphertext: ' . $encrypted_txt . PHP_EOL;