import { HttpRequestIntent, SessionIdPayload } from '@frontmcp/sdk';
export declare function encryptJson(obj: unknown): string;
/**
 * Validates an existing session header OR creates a fresh one.
 * - Valid: nodeId matches local, authSig matches current Authorization
 * - On any mismatch/decrypt error → generate new
 */
export declare function parseSessionHeader(sessionHeader: string | undefined, token: string): {
    id: string;
    payload: SessionIdPayload;
} | undefined;
export declare function createSessionId(protocol: HttpRequestIntent, token: string): {
    id: string;
    payload: SessionIdPayload;
};
export declare function generateSessionCookie(sessionId: string, ttlInMinutes?: number): string;
export declare function extractSessionFromCookie(cookie?: string): string | undefined;