/**
 * Copyright (c) Whales Corp.
 * All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
/// <reference types="node" />
export declare function pbkdf2_sha512(key: string | Buffer, salt: string | Buffer, iterations: number, keyLen: number): Promise<Buffer>;