/**
 * @license
 * Copyright 2023 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import * as keyManager from '../../../internal/key_manager';
import { PbHpkePrivateKey, PbKeyData, PbMessage } from '../../../internal/proto';
import * as util from '../../../internal/util';
import { HybridDecrypt } from '../hybrid_decrypt';
/**
 * A container for methods that generate new HPKE key pairs.
 * These methods are separate from the KeyManager as their functionality is
 * independent of the primitive of the corresponding KeyManager.
 * @final
 */
declare class HpkePrivateKeyFactory implements keyManager.PrivateKeyFactory {
    /**
     * Generates a new random HPKE key according to 'keyFormat'.
     *
     * @param keyFormat is either a KeyFormat
     *     proto or a serialized KeyFormat proto
     * @return the new generated HPKE private key
     */
    newKey(keyFormat: PbMessage | Uint8Array): Promise<PbHpkePrivateKey>;
    /**
     * Generates a new random HPKE key based on the "serialized_key_format" and
     * returns it as a KeyData proto.
     */
    newKeyData(serializedKeyFormat: PbMessage | Uint8Array): Promise<PbKeyData>;
    /**
     * Returns an HPKE public key data extracted from the given serialized HPKE
     * private key.
     */
    getPublicKeyData(serializedPrivateKey: Uint8Array): PbKeyData;
    /**
     * The input keyFormat is either deserialized (in case that the input is
     * Uint8Array) or checked to be an HpkeKeyFormat-proto (otherwise).
     */
    private static getKeyFormatProto;
    private static deserializeKeyFormat;
}
/**
 * Key manager that generates new {@link HpkePrivateKey} keys and produces new
 * instances of {@link HpkeDecrypt} primitives.
 *
 * @final
 */
export declare class HpkePrivateKeyManager implements keyManager.KeyManager<HybridDecrypt> {
    private static readonly SUPPORTED_PRIMITIVE;
    static KEY_TYPE: string;
    keyFactory: HpkePrivateKeyFactory;
    /**
     * Constructs an instance of the 'HybridDecrypt' primitive for a given HPKE
     * key.
     */
    getPrimitive(primitiveType: util.Constructor<HybridDecrypt>, key: PbKeyData | PbMessage): Promise<HybridDecrypt>;
    /** Returns true if this KeyManager supports 'HpkePrivateKey' key type. */
    doesSupport(keyType: string): boolean;
    /** Returns the URL which identifies the keys managed by this KeyManager. */
    getKeyType(): string;
    /**
     * Returns the type of primitive which can be generated by this KeyManager,
     * i.e. 'HybridDecrypt'
     */
    getPrimitiveType(): typeof HybridDecrypt;
    getVersion(): number;
    getKeyFactory(): HpkePrivateKeyFactory;
    private static getKeyProto;
    private static getKeyProtoFromKeyData;
}
export {};