QT directly uses the functions in OpenSSL

Briefly

OpenSSL is a strong Secure Sockets Layer cipher library that includes key cryptographic algorithms, common key and certificate encapsulation management functions, and SSL protocols, and provides a rich set of applications for testing or other purposes.

• Briefly
• Download installation
• Use
• More references

Download installation

Go to the Win32 OpenSSL download page and select the version that is appropriate for your download.

After the download is complete, I select the directory for the installation D:\Program Files\OpenSSL-Win32 . Into the installation directory, you can see that the following folders are mainly included:

Lib: Contains all the library files (for example: Libeay32.lib, Ssleay32.lib).
Include: Contains all the header files (for example: Aes.h, md5.h).
Bin: Contains a test program, a file that stores certificates and keys (*.PEM).

If you want to compile yourself, refer to: Compiling OpenSSL under windows

Use

Include library files and paths in Pro.

+= -L"D:/Program Files/OpenSSL-Win32/lib" -llibeay32LIBS += -L"D:/Program Files/OpenSSL-Win32/lib" -lssleay32INCLUDEPATH += $$quote(D:/Program Files/OpenSSL-Win32/include)

You can then use the sha256 as an example to encrypt the string.

#include <openssl/ssl.h>STD::string sha256 (const std::< Span class= "hljs-built_in" >string str) {char buf[2]; unsigned char hash[sha256_digest_length]; Sha256_ctx sha256; Sha256_init (&sha256); Sha256_update (&sha256, Str.c_str (), str.size ()); Sha256_final (hash, &sha256); std::string newstring =  ""; for (int i = 0; i < SHA256_DIGEST_ LENGTH; i++) {sprintf (Buf, "%02x", Hash[i]); newstring = newString + buf ; } return newstring;}           

Take "Hello world", for example, to verify.

int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    std::string str = "Hello World"; qDebug() << QString::fromStdString(sha256(str)); return a.exec();}

Output result: "a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e"

In order to determine whether the output is correct, we can conduct online verification on the Internet.

More references

• Windows compiles OpenSSL
• Openssl
• How to Include OpenSSL in a Qt project
• Building OpenSSL for Visual Studio
• How do I compile OpenSSL under Windows?

http://blog.csdn.net/liang19890820/article/details/51611400

QT directly uses the functions in OpenSSL