使用了hash-library开源哈希算法库，https://conan.io/center/hash-library?tab=overview&os=Linux。

全部代码：

git clone https://github.com/MisakaMikoto128/MqttSignTool.git

main.cpp

#include <iostream>
#include "aliyunmqttpasswordgenerator.h"
int main(int argc, char *argv[])
{QCoreApplication a(argc, argv);std::string host = "iot-as-mqtt.cn-shanghai.aliyuncs.com";std::string productKey = "a1w78T9VVmM";std::string deviceName = "dev1";std::string deviceSecret = "1041d8898a6cdc5a851074c1543c98db";std::string SN = "SN";const AliyunMqttPasswordGenerator gen(host,productKey,deviceName,deviceSecret,SN);std::cout << "hostName:" << gen.hostName() << std::endl;std::cout << "clientId:" << gen.clientId() << std::endl;std::cout << "userName:" << gen.userName() << std::endl;std::cout << "password:" << gen.password() << std::endl;std::cout << "SupportSignMethod:" << gen.getSupportSignMethod()[0] << std::endl;return a.exec();
}

aliyunmqttpasswordgenerator.h

#ifndef ALIYUNMQTTPASSWORDGENERATOR_H
#define ALIYUNMQTTPASSWORDGENERATOR_H#include <iostream>
#include "hash-library/sha1.h"
#include "hash-library/md5.h"
#include "hash-library/sha256.h"
#include "hash-library/hmac.h"
#include <vector>
class AliyunMqttPasswordGenerator
{
private:std::string host;std::string productKey;std::string deviceName;std::string deviceSecret;std::string deviceIdentifierString;std::string timestamp;std::string signContent;std::string signMethod = "hmacsha256";static const std::vector<std::string> supportSignMethod;int secureMode = 2;std::string getSignContent();
public:AliyunMqttPasswordGenerator(const std::string&host,const std::string&productKey,const std::string&deviceName,\const std::string&deviceSecret,const std::string&deviceIdentifierString,\const std::string& signMethod = "hmacsha256");void updateTimestamp();std::string clientId() const;std::string hostName() const;std::string userName() const;std::string password() const;static const std::vector<std::string> &getSupportSignMethod();bool signMethodIsSupported(const std::string& signMethod);
};#endif // ALIYUNMQTTPASSWORDGENERATOR_H

aliyunmqttpasswordgenerator.cpp

#include "aliyunmqttpasswordgenerator.h"#if defined(_WIN32) || defined(_WIN64)
//define something for Windows (64-bit only)
#include <windows.h>
#include <time.h>
static uint64_t getCurrentSecTimestamp(){time_t t;time(&t);return t;
}
#elif __APPLE__
#if TARGET_IPHONE_SIMULATOR
// iOS Simulator
#elif TARGET_OS_IPHONE
// iOS device
#elif TARGET_OS_MAC
// Other kinds of Mac OS
#endif
#elif __ANDROID__
// android
#elif __linux__
// linux
#include <sys/time.h>
#include <unistd.h>
static uint64_t g getCurrentSecTimestamp(){struct timeval tv;gettimeofday(&tv, NULL);return tv.tv_sec;
}
#elif __unix__ // all unices not caught above
// Unix
#elif defined(_POSIX_VERSION)
// POSIX
#else
#error "Unknown"
#endifconst std::vector<std::string> AliyunMqttPasswordGenerator::supportSignMethod = {"hmacsha1","hmacmd5","hmacsha256"};const std::vector<std::string> &AliyunMqttPasswordGenerator::getSupportSignMethod()
{return supportSignMethod;
}bool AliyunMqttPasswordGenerator::signMethodIsSupported(const std::string &signMethod)
{bool ret = false;for(std::vector<std::string>::const_iterator it = this->supportSignMethod.begin(); it != this->supportSignMethod.end(); it++){if(*it == signMethod){ret = true;}}return ret;
}std::string AliyunMqttPasswordGenerator::getSignContent()
{std::string signContent = \"clientId"+this->deviceIdentifierString+\"deviceName"+this->deviceName+ \"productKey"+this->productKey+ \"timestamp" +this->timestamp;return signContent;
}AliyunMqttPasswordGenerator::AliyunMqttPasswordGenerator(const std::string&host,const std::string&productKey,const std::string&deviceName,\const std::string&deviceSecret,const std::string&deviceIdentifierString,\const std::string& signMethod)
{updateTimestamp();this->host = host;this->productKey = productKey;this->deviceName = deviceName;this->deviceSecret = deviceSecret;this->deviceIdentifierString = deviceIdentifierString;if(signMethodIsSupported(signMethod)){this->signMethod = signMethod;}//else{ //have a default value.}this->signContent = getSignContent();}void AliyunMqttPasswordGenerator::updateTimestamp()
{timestamp = std::to_string(getCurrentSecTimestamp());std::cout << "timestamp" <<getCurrentSecTimestamp()<<std::endl;
}std::string AliyunMqttPasswordGenerator::clientId() const
{std::string clientId =this->deviceIdentifierString+ \"|securemode="  + std::to_string(this->secureMode) +\",signmethod="  + signMethod+\",timestamp="   + timestamp+"|";return clientId;
}std::string AliyunMqttPasswordGenerator::hostName() const
{return productKey+"."+host;
}std::string AliyunMqttPasswordGenerator::userName() const
{return deviceName+"&"+productKey;
}std::string AliyunMqttPasswordGenerator::password() const
{std::string sha1hmac;if(this->signMethod == this->supportSignMethod[0]){sha1hmac = hmac<SHA1>(this->signContent, this->deviceSecret);}else if(this->signMethod == this->supportSignMethod[1]){sha1hmac = hmac<MD5>(this->signContent, this->deviceSecret);}else if(this->signMethod == this->supportSignMethod[2]){sha1hmac = hmac<SHA256>(this->signContent, this->deviceSecret);}return sha1hmac;
}

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