import { Config } from "./config";
export declare function checkNonceAge(nonce: string, maxAge: number): {
    clientError: string;
} | undefined;
export declare function validateNonce(nonce: string, providedHmac: string, config: Config): {
    clientError: string;
} | undefined;
export declare function generateNonce(): string;
export declare function createNonceHmac(nonce: string, config: Config): string;