import { SecureStorageConfig } from '../interfaces/config.interface';
export declare class CryptService {
    private config;
    /**
     * Secret key
     */
    private secretKey;
    /**
     * Crypt service constructor.
     *
     * @param config
     */
    constructor(config: SecureStorageConfig);
    /**
     * Encrypt key
     *
     * @param key
     *
     * @returns string
     */
    encryptKey(key: string): string;
    /**
     * Encrypt string
     *
     * @param value
     *
     * @returns string
     */
    encryptString(value: string): string;
    /**
     * Decrypt string.
     *
     * @param value
     *
     * @returns string
     */
    decryptString(value: string): string;
    /**
     * Encrypt string.
     *
     * @param value
     *
     * @returns string
     */
    encryptJson(value: string): string;
    /**
     * Decrypt string.
     *
     * @param value
     *
     * @returns string
     */
    decryptJson(value: string): any;
}