/**
 * hkdf.js
 */
import { HashTypes } from './params';
/**
 * Hash-based Key Derivation Function computing from given master secret and salt.
 * If salt is not given, salt would be automatically generated inside.
 * Specification is given in RFC5869 {@link https://tools.ietf.org/html/rfc5869}.
 * @param {Uint8Array} master - Master secret to derive the key.
 * @param {String} [hash='SHA-256] - Name of hash algorithm used to derive the key.
 * @param {Number} [length = 32] - Intended length of derived key.
 * @param {String} [info=''] - String for information field of HKDF.
 * @param {Uint8Array} [salt=null] - Byte array of salt.
 * @return {Promise<{key: Uint8Array, salt: Uint8Array}>} - Derived key and salt used to derive the key.
 */
export declare const compute: (master: Uint8Array, hash?: HashTypes, length?: number, info?: string, salt?: Uint8Array | null) => Promise<{
    key: Uint8Array;
    salt: Uint8Array;
}>;