export interface TokenPayload {
    key: string;
    contentType?: string;
    maxSize?: number;
    minSize?: number;
    /** Expiry, epoch milliseconds. */
    exp: number;
}
export type VerifyResult = {
    ok: true;
    payload: TokenPayload;
} | {
    ok: false;
    failure: "malformed" | "signature" | "expired";
};
export declare const signToken: (payload: TokenPayload, secret: string) => Promise<string>;
export declare const verifyToken: (token: string, secret: string, now?: number) => Promise<VerifyResult>;
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