OpenPgp密钥生成，加解密，签名验签

// open a file and attempt to read the contents into a PGP data structure
template <typename T>
bool read_pgp(const std::string & name, T & pgp, const std::string & directory = ""){
   
    std::ifstream file(directory + name);
    if (!file){
   

        return false;
    }
    pgp.read(std::string(std::istreambuf_iterator <char> (file), {