/// <reference types="node" />
import { algorithm } from './key';
export default class {
    protected readonly key: Buffer;
    protected readonly algorithm: algorithm;
    /**
     * Initialize the class
     *
     * @param key The key used to encrypt/decrypt the strings
     * @param algorithm The algorithm used to encrypt/decrypt the strings
     */
    constructor(key: Buffer, algorithm?: algorithm);
    /**
     * Method to decrypt an encrypted string
     *
     * @param encrypted The string to decrypt
     * @returns The string decrypted
     */
    decrypt(encrypted: string): string;
    /**
     * Method to enctypt a string
     *
     * @param value The value to encrypt
     * @returns The string encrypted
     */
    encrypt(value: string): string;
    /**
     * Method to check if the provided key is valid
     */
    protected checkKey(): void;
}