近期项目中HTTPS通讯中，token需要使用HMAC-MD5算法生成，往上找了一些资料后，仍不能满足自身需求，故次一记。

前期准备：

①下载Cryptopp库（我下载的是8.8.0 Release版本）：Crypto++ Library 8.9 | Free C++ Class Library of Cryptographic Schemes

②进行编译，根据自身情况进行VS环境配置

将cryptdll、cryptlib编译后分别按文件夹分类保存

【lib：cryptlib.lib、cryptopp.lib】【dll：cryptopp.dll】

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也可以直接下载我编译好的：

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HMAC-SHA256算法实现：

#include <iostream>
#include <string>
#include <cryptopp/hmac.h>
#include <cryptopp/sha.h>
int main() 
{std::string key = "mysecretkey";std::string data = "Hello, HMAC!";CryptoPP::HMAC<CryptoPP::SHA256> hmac((const byte*)key.data(), key.size());byte digest[CryptoPP::SHA256::DIGESTSIZE];hmac.Update((const byte*)data.data(), data.size());hmac.Final(digest);std::cout << "HMAC-SHA256: ";for (int i = 0; i < CryptoPP::SHA256::DIGESTSIZE; i++) {printf("%02x", digest[i]);}std::cout << std::endl;return 0;
}

MD5算法实现：

std::string crypto::md5(std::string text)
{std::string digest;CryptoPP::Weak1::MD5 md5;CryptoPP::HashFilter hashfilter(md5);hashfilter.Attach(new CryptoPP::HexEncoder(new CryptoPP::StringSink(digest), false));hashfilter.Put(reinterpret_cast<const unsigned char*>(text.c_str()), text.length());hashfilter.MessageEnd();return digest;
}

HMAC-MD5算法实现：

#include "hmac.h"
#include "md5.h"{QJsonObject json;json["key"] = "1234567890";QJsonDocument document;document.setObject(json);QByteArray ba = document.toJson(QJsonDocument::Compact);//Indented : Compactstd::string key = "apple";std::string body = ba.data();CryptoPP::HMAC<CryptoPP::Weak1::MD5> hmac((const CryptoPP::byte*)key.data(), key.size());CryptoPP::byte digest[CryptoPP::Weak1::MD5::DIGESTSIZE];hmac.Update((const CryptoPP::byte*)body.data(), body.size());hmac.Final(digest);std::cout << "HMAC-MD5: ";for (int i = 0; i < CryptoPP::Weak1::MD5::DIGESTSIZE; i++) {printf("%02x", digest[i]);}std::cout << std::endl;
}