#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1 #include <cryptopp/md5.h> #include <cryptopp/filters.h> #include <cryptopp/hex.h> #include <cryptopp/files.h> #include <string> #include <iostream> using namespace std; using namespace CryptoPP; int main(){ string digest1, digest2; string msg1 = "Cybersecurity 221"; string msg2 = "Cybersecurity221"; Weak::MD5 md5; cout << md5.AlgorithmName() << endl; cout << md5.BlockSize() << endl; cout << md5.TagSize() << endl; md5.Update((CryptoPP::byte*)&msg1[0], msg1.size()); digest1.resize(md5.DigestSize()); md5.Final((CryptoPP::byte*)&digest1[0]); cout << "Message:" << msg1 << endl << "Digest:" ; StringSource(digest1, true, new HexEncoder(new FileSink(cout))); cout << endl; StringSource(msg2, true, new HashFilter(md5, new StringSink(digest2))); cout << "Message:" << msg2<< endl << "Digest:"; StringSource(digest2, true, new HexEncoder(new FileSink(cout))); cout << endl; bool result; StringSource(digest1 + msg1, true, new HashVerificationFilter(md5, new ArrayXorSink((CryptoPP::byte*)&result, sizeof(result)))); if(result){ cout << "Success" << endl; }else{ cout << "Failure" << endl; } return 0; }在算法中标注各个函数起到的功能

1. 引入 Crypto++ 库中 MD5 算法的命名空间

#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1

2. 引入 Crypto++ 库中 MD5 算法的头文件

#include <cryptopp/md5.h>

3. 引入 Crypto++ 库中实现数据过滤的头文件

#include <cryptopp/filters.h>

4. 引入 Crypto++ 库中实现十六进制编码的头文件

#include <cryptopp/hex.h>

5. 引入 Crypto++ 库中实现文件输入输出的头文件

#include <cryptopp/files.h>

6. 引入 C++ 标准库中的头文件

#include <string>
#include <iostream>

7. 使用 Crypto++ 库中 MD5 算法的命名空间和命名空间 CryptoPP

using namespace std;
using namespace CryptoPP;

8. 程序入口 main 函数

int main(){

9. 定义两个字符串 msg1 和 msg2，分别代表两个不同的消息

string msg1 = "Cybersecurity 221";
string msg2 = "Cybersecurity221";

10. 定义一个 Weak::MD5 对象 md5，并输出该哈希算法的名称、块大小和标签大小

Weak::MD5 md5;
cout << md5.AlgorithmName() << endl;
cout << md5.BlockSize() << endl;
cout << md5.TagSize() << endl;

11. 对 msg1 进行哈希计算，并输出计算结果

md5.Update((CryptoPP::byte*)&msg1[0], msg1.size());
digest1.resize(md5.DigestSize());
md5.Final((CryptoPP::byte*)&digest1[0]);
cout << "Message:" << msg1 << endl << "Digest:" ;
StringSource(digest1, true, new HexEncoder(new FileSink(cout)));
cout << endl;

12. 对 msg2 进行哈希计算，并输出计算结果

StringSource(msg2, true, new HashFilter(md5, new StringSink(digest2)));
cout << "Message:" << msg2<< endl << "Digest:";
StringSource(digest2, true, new HexEncoder(new FileSink(cout)));
cout << endl;

13. 将 digest1 和 msg1 连接起来，验证其哈希结果是否与之前计算得到的结果一致

bool result;
StringSource(digest1 + msg1, true, new HashVerificationFilter(md5, new ArrayXorSink((CryptoPP::byte*)&result, sizeof(result))));
if(result){
    cout << "Success" << endl;
}else{
    cout << "Failure" << endl;
}

14. 程序结束

return 0;