import type { EncryptionService } from "../middleware";
/**
 * The AES encryption service used by the encryption middleware.
 *
 * This service uses AES encryption to encrypt and decrypt data. It supports
 * multiple keys, so that you can rotate keys without breaking existing
 * encrypted data.
 *
 * It was the method used before the default encryption service using LibSodium
 * was added, and is still used internally for decrypting data to ensure
 * compatibility with older versions.
 */
export declare class AESEncryptionService implements EncryptionService {
    private readonly keys;
    identifier: string;
    constructor(key: string | string[] | undefined);
    encrypt(value: unknown): string;
    decrypt(value: string): unknown;
}