技術標籤：# C++

準備

# openssl version
OpenSSL 1.0.2k-fips  26 Jan 2017

使用

例子1

1、建立一個工程

2、Cmakelist.txt

cmake_minimum_required(VERSION 3.16)
project(llibz)

set(CMAKE_CXX_STANDARD 11)

add_executable(${PROJECT_NAME} main.cpp)
target_link_libraries (${PROJECT_NAME} -lcrypto)

3、main.cpp

#include <openssl/ssl.h>
 


std::string sha256(const std::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;
}

例子2

1、建立一個工程

2、Cmakelist.txt

cmake_minimum_required(VERSION 3.16)
project(llibz)

set(CMAKE_CXX_STANDARD 11)

add_executable(${PROJECT_NAME}
 
 main.cpp)
target_link_libraries (${PROJECT_NAME}  -lssl)

3、main.cpp

#include <stdio.h>

#include "openssl/ssl.h"

int main ()
{
    SSL_CTX* ctx = NULL;
    const SSL_METHOD* meth = NULL;

    OpenSSL_add_ssl_algorithms();    // 初始化
    SSL_load_error_strings();        // 為列印除錯資訊作準備
    meth = TLSv1_client_method();    // 採用什麼協議(SSLv2/SSLv3/TLSv1)在此指定
    ctx = SSL_CTX_new (meth);
    printf("%X\n", ctx);

    return 0;
}