/**
 * @license
 * Copyright 2022 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import * as ellipticCurves from '../../../subtle/elliptic_curves';
import { HpkeKemPrivateKey } from './hpke_kem_private_key';
/**
 * Private keys used in Diffie-Hellman-based P256 and P521 HPKE KEM
 * variants.
 */
export declare class NistCurvesHpkeKemPrivateKey implements HpkeKemPrivateKey {
    readonly privateKey: CryptoKey;
    readonly publicKey: CryptoKey;
    constructor(privateKey: CryptoKey, publicKey: CryptoKey);
    getSerializedPublicKey(): Promise<Uint8Array>;
}
/**
 * Converts an uncompressed point encoded `publicKey` and its associated
 * `privateKey` into a `NistCurvesHpkeKemPrivateKey`.
 */
export declare function fromBytes({ privateKey, publicKey, curveType }: {
    privateKey: Uint8Array;
    publicKey: Uint8Array;
    curveType: ellipticCurves.CurveType.P256 | ellipticCurves.CurveType.P521;
}): Promise<NistCurvesHpkeKemPrivateKey>;
/**
 * Converts a `CryptoKeyPair` into a `NistCurvesHpkeKemPrivateKey`. The
 * algorithm on both keys must be ECDH and both keys should be valid.
 */
export declare function fromCryptoKeyPair(keyPair: CryptoKeyPair): Promise<NistCurvesHpkeKemPrivateKey>;