Linux(openssl)：X509_verify通过ca证书的public key验证证书的签名

/docs/man3.0/man3/X509_verify.html (openssl.org)

提供了方法用于通过ca证书的public key验证证书的签名

//verify_cert.hpp
#include <string>
#include <memory>
#include <filesystem>
#include <openssl/pem.h>using namespace std;
namespace fs = std::filesystem;class CertVerify{
public:CertVerify(const fs::path& certFilePath, const fs::path& caFilePath) : m_certFilePath(certFilePath), m_caFilePath(caFilePath) {}public:int doVerify(){if(m_certFilePath.string().length() == 0 || m_caFilePath.string().length() == 0){return -1;}if(!fs::exists(m_certFilePath) || !fs::exists(m_caFilePath)){return -2;}shared_ptr<BIO> certBio(BIO_new_fil