/**
 * @fileoverview ECIES Key Encryption Handler Factory
 *
 * Provides async key encryption/decryption handler types and a factory
 * function that creates ECIES-backed key encryption handlers. These replace
 * the placeholder base64 encoding used by ChannelService and GroupService.
 *
 * @see Requirements 8.1, 8.2, 8.3, 8.5, 12.1, 12.2
 */
/**
 * Async key encryption handler type — replaces the sync placeholder.
 * Returns encrypted key as Uint8Array (not string) for proper binary handling.
 */
export type AsyncKeyEncryptionHandler = (memberId: string, symmetricKey: Uint8Array) => Promise<Uint8Array>;
/**
 * Async key decryption handler type — unwraps a wrapped key using a member's private key.
 */
export type AsyncKeyDecryptionHandler = (memberId: string, wrappedKey: Uint8Array) => Promise<Uint8Array>;
/**
 * Dependencies for creating the ECIES key encryption handler.
 */
export interface IEciesHandlerDeps {
    eciesService: {
        encryptBasic: (publicKey: Uint8Array, plaintext: Uint8Array) => Promise<Uint8Array>;
    };
    getMemberPublicKey: (memberId: string) => Promise<Uint8Array | null | undefined>;
}
/**
 * Creates an async ECIES-backed key encryption handler.
 * Looks up the member's public key, then encrypts the symmetric key under it.
 *
 * @throws {MissingPublicKeyError} when getMemberPublicKey returns null/undefined
 * @see Requirements 8.1, 8.2, 8.3, 8.5, 12.1, 12.2
 */
export declare function createEciesKeyEncryptionHandler(deps: IEciesHandlerDeps): AsyncKeyEncryptionHandler;
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