import { DBDockConfigService } from '../config/config.service';
import { Transform } from 'stream';
export interface EncryptionMetadata {
    algorithm: string;
    salt: string;
    iv: string;
}
export declare class CryptoService {
    private configService;
    private readonly logger;
    private readonly enabled;
    private readonly secret?;
    private readonly iterations;
    constructor(configService: DBDockConfigService);
    isEnabled(): boolean;
    createEncryptStream(): {
        stream: Transform;
        metadata: EncryptionMetadata;
    };
    createDecryptStream(metadata: EncryptionMetadata): Transform;
    generateBackupKey(): string;
}