import { EncryptedData, HybridGroupSessionKey } from '@towns-protocol/proto';
import { EncryptionAlgorithm, EnsureOutboundSessionOpts, IEncryptionParams } from './base';
import { GroupEncryptionAlgorithmId } from './olmLib';
/**
 * Hybrid Group encryption implementation
 *
 * @param params - parameters, as per {@link EncryptionAlgorithm}
 */
export declare class HybridGroupEncryption extends EncryptionAlgorithm {
    readonly algorithm = GroupEncryptionAlgorithmId.HybridGroupEncryption;
    constructor(params: IEncryptionParams);
    ensureOutboundSession(streamId: string, opts?: EnsureOutboundSessionOpts): Promise<string>;
    _ensureOutboundSession(streamId: string, opts?: EnsureOutboundSessionOpts): Promise<HybridGroupSessionKey>;
    hasOutboundSession(streamId: string): Promise<boolean>;
    private shareSession;
    /**
     * @deprecated
     */
    encrypt_deprecated_v0(streamId: string, payload: string): Promise<EncryptedData>;
    /**
     * @param content - plaintext event content
     *
     * @returns Promise which resolves to the new event body
     */
    encrypt(streamId: string, payload: Uint8Array): Promise<EncryptedData>;
}
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