/// <reference types="node" />
export declare class PKCS7Padding {
    private readonly blockSize;
    constructor(blockSize?: number);
    pad(text: Buffer): Buffer;
    unpad(text: Buffer): Buffer;
}
export declare class WXBizMsgCrypt {
    private readonly appid;
    private readonly token;
    private readonly key;
    private readonly iv;
    private readonly padding;
    constructor(appid: string, token: string, encodingAESKey: string, padding?: PKCS7Padding);
    getSignature(timestamp: string, nonce: string, encrypt: string): string;
    encrypt(message: string): string;
    decrypt(ciphered: string): string | false;
}