import { IStorageAdapter } from './adapters/IStorageAdapter';
export interface IKeyStorageConfig {
    /**
     * Path to folder where to store the data (Node.js only).
     */
    dir?: string;
    /**
     * Name of the IndexedDB database where to store the data (Browsers only).
     */
    name?: string;
    /**
     * The {@link IStorageAdapter} implementation to be used as a storage backend.
     */
    adapter?: IStorageAdapter;
}
/**
 * Class representing a storage container for private key data.
 * Use this class if you need to load the keys stored with
 * version 4.x of this library. For new code, use the
 * {@link PrivateKeyStorage} instead.
 *
 * @deprecated since version 5.0
 */
export declare class KeyStorage {
    private adapter;
    constructor(config?: IKeyStorageConfig | string);
    /**
     * Checks whether a private key data with the given name exist in persistent storage.
     * @param {string} name - Name to check.
     * @returns {Promise<boolean>} - True if key data exist, otherwise false.
     */
    exists(name: string): Promise<boolean>;
    /**
     * Loads the private key data by the given name.
     * @param {string} name - Name of key data to load.
     * @returns {Promise<string | null>} - Private key data as a string,
     * or null if there is no data for the given name.
     */
    load(name: string): Promise<string | null>;
    /**
     * Removes the private key data stored under the given name from persistent storage.
     * @param {string} name - Name of the key data to remove.
     * @returns {Promise<boolean>} - True if the key has been removed, otherwise false.
     */
    remove(name: string): Promise<boolean>;
    /**
     * Persists the private key data under the given name.
     * @param {string} name - Name of the key data.
     * @param {string} data - The key data.
     * @returns {Promise<void>}
     */
    save(name: string, data: string): Promise<void>;
}