import { HttpMethod } from '../constants/common.constant';
import { WechatPayModuleOptions } from '../interfaces/options.interface';
export declare class SignUtil {
    private readonly options;
    constructor(options: WechatPayModuleOptions);
    /**
     * Http请求签名
     * @param method Http请求方法
     * @param nonceStr 随机字符串
     * @param timestamp 时间戳
     * @param url URL路径（相对路径，例如：/v3/pay/transactions/h5）
     * @param body 请求参数
     * @returns 签名结果
     */
    httpSignature(method: HttpMethod, nonceStr: string, timestamp: string, url: string, body?: string | object): string;
    /**
     * SHA256withRSA加密
     * @param data 待加密字符串
     * @returns 加密结果
     */
    sha256WithRsa(data: string): string;
}