import { type KeyObject } from 'crypto';
import type { SealedFrame, WrappedKey } from './contract';
export type { SealedFrame, WrappedKey };
export declare const FRAME_VERSION = 1;
export declare const MAX_DEVICES = 5;
export interface DeviceKey {
    kid: string;
    pub: Buffer;
}
export declare function strictDecode(value: unknown, expectedBytes?: number): Buffer;
export declare function lp(buf: Buffer): Buffer;
export declare function u16be(n: number): Buffer;
export declare function u32be(n: number): Buffer;
export declare function u64be(n: number): Buffer;
export declare function signingInput(frame: Record<string, unknown>): Buffer;
export declare function rawPublic(key: KeyObject): Buffer;
export declare function publicFromPrivate(key: KeyObject): Buffer;
export declare function rawPrivate(key: KeyObject): Buffer;
export declare function x25519PublicFromRaw(raw: Buffer): KeyObject;
export declare function x25519PrivateFromRaw(priv: Buffer, pub: Buffer): KeyObject;
export declare function ed25519PublicFromRaw(raw: Buffer): KeyObject;
export declare function ed25519PrivateFromRaw(priv: Buffer, pub: Buffer): KeyObject;
export interface SealedRequest {
    type: 'ask';
    v: number;
    id: string;
    eph: string;
    body: string;
}
export declare function sealRequest(opts: {
    boat: string;
    id: string;
    plaintext: string;
    inbox: Buffer;
}): SealedRequest;
export declare function openRequest(envelope: unknown, boat: string, inboxPriv: Buffer, inboxPub: Buffer): {
    id: string;
    plaintext: string;
};
export interface RejectedDevice {
    kid: string;
    reason: string;
}
export interface SealResult {
    frame: SealedFrame;
    rejected: RejectedDevice[];
}
export interface SealOptions {
    boat: string;
    ts: number;
    plaintext: string;
    devices: DeviceKey[];
    identity: KeyObject;
    extensions?: Record<string, string>;
}
export declare function sealFrame(opts: SealOptions): SealResult;
export declare function verifyFrame(frame: unknown, boatIdentityPub: KeyObject): boolean;
export declare function openFrame(frame: SealedFrame, boatIdentityPub: KeyObject, kid: string, priv: Buffer, pub: Buffer): string;