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环境#xff1a;
Win11 64位
VS2019 Qt5.15.2
核心思路#xff1a;
将授权相关信息加密保存到License.txt中#xff0c;软件运行时获取并解密授权信息#xff0c;判断是否在限制期限内即可。
加解密部分使用第三方openssl库进行#xff0c;因此需要手动在…写在前面
环境
Win11 64位
VS2019 Qt5.15.2
核心思路
将授权相关信息加密保存到License.txt中软件运行时获取并解密授权信息判断是否在限制期限内即可。
加解密部分使用第三方openssl库进行因此需要手动在项目中链接下openssl库参考步骤如下。
链接openssl库
①官网下载openssl库安装包 官网链接https://slproweb.com/products/Win32OpenSSL.html
下载自己当前操作系统位数对应的安装包即可我当前系统为Win11 64位因此下载以下安装包
②双击安装。注意勾选添加到系统环境变量 ③打开安装目录如下
④拷贝include文件夹到项目路径下 ⑤拷贝当前项目使用运行库对应的lib到项目路径下这里使用MD Release版本中的动态库 不会全部用到可按需选择使用。
例如只用到以下三个库 ⑥在项目中链接这三个库包含相应头文件即可使用
示例
//AuthorizationManager.h
#pragma once
#include cstring
#include fstream
#include iostream
#include string
#include sstreamstruct MyLicense
{int nAuthorizationStatus{ 1 }; //0: 未授权 1: 已授权std::string sFirstRunDate; //首次运行日期int nAuthorizationDays{ -1 }; //授权天数std::string Serialize(){std::ostringstream os;os nAuthorizationStatus \n sFirstRunDate \n nAuthorizationDays \n;return os.str();}void Deserialize(const std::string str){std::istringstream is(str);is nAuthorizationStatus;is.ignore();std::getline(is, sFirstRunDate);sFirstRunDate sFirstRunDate.substr(0, sFirstRunDate.length());is nAuthorizationDays;}
};class AuthorizationManager
{
public:static AuthorizationManager Instance(){static AuthorizationManager instance;return instance;}AuthorizationManager(const AuthorizationManager) delete;AuthorizationManager operator(const AuthorizationManager) delete;std::string do_encrypt(const std::string plaintext, const std::string key, const std::string iv);std::string do_decrypt(const std::string ciphertext, const std::string key, const std::string iv);bool AuthorizationVerify();private:AuthorizationManager() default;};#include AuthorizationManager.h
#include openssl/evp.h
#include openssl/aes.h
#include vector
#include QDatestd::string AuthorizationManager::do_encrypt(const std::string plaintext, const std::string key, const std::string iv)
{EVP_CIPHER_CTX* ctx;std::vectorunsigned char ciphertext(plaintext.size() EVP_MAX_BLOCK_LENGTH);int len;int ciphertext_len;if (!(ctx EVP_CIPHER_CTX_new())){return ;}if (1 ! EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, (const unsigned char*)key.c_str(), (const unsigned char*)iv.c_str())){return ;}if (1 ! EVP_EncryptUpdate(ctx, ciphertext.data(), len, (const unsigned char*)plaintext.c_str(), plaintext.size())){return ;}ciphertext_len len;if (1 ! EVP_EncryptFinal_ex(ctx, ciphertext.data() len, len)){return ;}ciphertext_len len;EVP_CIPHER_CTX_free(ctx);return std::string((char*)ciphertext.data(), ciphertext_len);
}std::string AuthorizationManager::do_decrypt(const std::string ciphertext, const std::string key, const std::string iv)
{EVP_CIPHER_CTX* ctx;std::vectorunsigned char plaintext(ciphertext.size());int len;int plaintext_len;if (!(ctx EVP_CIPHER_CTX_new())){return ;}if (1 ! EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, (const unsigned char*)key.c_str(), (const unsigned char*)iv.c_str())){return ;}if (1 ! EVP_DecryptUpdate(ctx, plaintext.data(), len, (const unsigned char*)ciphertext.c_str(), ciphertext.size())){return ;}plaintext_len len;if (1 ! EVP_DecryptFinal_ex(ctx, plaintext.data() len, len)){return ;}plaintext_len len;EVP_CIPHER_CTX_free(ctx);return std::string((char*)plaintext.data(), plaintext_len);
}bool AuthorizationManager::AuthorizationVerify()
{//密钥对妥善保管std::string key 98765432100123456789987654321001;std::string iv 9876543210012345;//构造授权//MyLicense original;//original.nAuthorizationStatus 1;//original.sFirstRunDate 2024-04-08;//original.nAuthorizationDays 90;//std::string serialized_str original.Serialize();//std::string ciphertext AuthorizationManager::Instance().do_encrypt(serialized_str, key, iv);//std::ofstream outfile(License.txt, std::ios::binary);//outfile ciphertext;//outfile.close();//获取授权std::ifstream infile(License.txt, std::ios::binary);std::stringstream ss;ss infile.rdbuf();std::string content ss.str();std::string decryptedtext AuthorizationManager::Instance().do_decrypt(content, key, iv);MyLicense restored;restored.Deserialize(decryptedtext);//授权校验bool bRet false;if (restored.nAuthorizationStatus 0){//首次运行授权MyLicense original;original.nAuthorizationStatus 1;QDate curDate QDate::currentDate();std::string sCurDate curDate.toString(yyyy-MM-dd).toStdString();original.sFirstRunDate sCurDate;original.nAuthorizationDays restored.nAuthorizationDays;std::string serialized_str original.Serialize();std::string ciphertext AuthorizationManager::Instance().do_encrypt(serialized_str, key, iv);std::ofstream outfile(License.txt, std::ios::binary);outfile ciphertext;outfile.close();bRet true;}else{QDate curDate QDate::currentDate();QDate firstRunDate QDate::fromString(QString::fromStdString(restored.sFirstRunDate), yyyy-MM-dd);QDate endDate firstRunDate.addDays(restored.nAuthorizationDays);if (curDate firstRunDate){bRet false;}else if (curDate endDate){bRet false;}else{bRet true;}}return bRet;
}
//main.cpp
#include AuthorizationWidget.h
#include QtWidgets/QApplication
#include AuthorizationManager.hint main(int argc, char* argv[])
{QApplication a(argc, argv);//授权检查if (!AuthorizationManager::Instance().AuthorizationVerify()){//未授权退出软件return false;}AuthorizationWidget w;w.show();return a.exec();
}
