/// <reference types="node" />
import crypto from 'node:crypto';
export declare type RsaKey = Parameters<crypto.Sign['sign']>[0];
export declare type HmacKey = Parameters<typeof crypto.createHmac>[1];
declare type JsonPrimitive = number | number[] | string | string[] | undefined | null;
declare type Json = {
    [key: string]: Json | JsonPrimitive;
};
interface Body extends Json {
    signature: string;
}
export declare function parametersToString(body: Json): string;
export declare function verifyRsaSignature(body: Body): boolean;
export declare function generateRsaSignature(body: Json, key: RsaKey): string;
export declare function generateHmacSignature(body: Json, key: HmacKey): string;
export declare function getRandomString(length: number): string;
export {};