declare type X = 0 | 8;
export declare function encrypt_message(data: Uint8Array, auth_key: Uint8Array, x?: X): {
    encrypted_data: Uint8Array;
    msg_key: Uint8Array;
};
export declare function decrypt_message(data: Uint8Array, auth_key: Uint8Array, msg_key: Uint8Array, x?: X): {
    decrypted_data: Uint8Array;
    msg_key: Uint8Array;
};
export {};