/**
 * @license
 * Copyright 2022 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
/**
 * Interface for Hybrid Public Key Encryption (HPKE) key derivation function
 * (KDF).
 *
 * HPKE RFC is available at https://www.rfc-editor.org/rfc/rfc9180.html.
 */
export interface HpkeKdf {
    /**
     * Extracts pseudorandom key from `salt` and `ikm` using the
     * HPKE-specific values `ikmLabel` and `suiteId` to facilitate domain
     * separation and context binding.
     *
     * More details available at
     * https://www.rfc-editor.org/rfc/rfc9180.html#section-4-9.
     *
     */
    labeledExtract({ ikm, ikmLabel, suiteId, salt }: {
        ikm: Uint8Array;
        ikmLabel: string;
        suiteId: Uint8Array;
        salt?: Uint8Array;
    }): Promise<Uint8Array>;
    /**
     * Expands pseudorandom key `prk` into `length` pseudorandom bytes
     * using `info` along with the HPKE-specific values `infoLabel`
     * and `suiteId` to facilitate domain separation and context binding.
     *
     * More details available at
     * https://www.rfc-editor.org/rfc/rfc9180.html#section-4-10.
     *
     */
    labeledExpand({ prk, info, infoLabel, suiteId, length }: {
        prk: Uint8Array;
        info: Uint8Array;
        infoLabel: string;
        suiteId: Uint8Array;
        length: number;
    }): Promise<Uint8Array>;
    /**
     * Combines `labeledExtract` and `labeledExpand` into a single method.
     *
     * More details available at
     * https://www.rfc-editor.org/rfc/rfc9180.html#section-4.1-3.
     *
     */
    extractAndExpand({ ikm, ikmLabel, info, infoLabel, suiteId, length, salt }: {
        ikm: Uint8Array;
        ikmLabel: string;
        info: Uint8Array;
        infoLabel: string;
        suiteId: Uint8Array;
        length: number;
        salt?: Uint8Array;
    }): Promise<Uint8Array>;
    /**
     * Returns the HPKE KDF algorithm identifier for the underlying
     * KDF implementation.
     *
     * More details at
     * https://www.rfc-editor.org/rfc/rfc9180.html#name-key-derivation-functions-kd.
     */
    getKdfId(): Uint8Array;
}