C/C++ 使用 cryptopp 加密解密

Crypto++（也称为CryptoPP）是一个流行的开源密码学库，提供了各种密码学算法的实现。它是用C++编写的，并在许可证允许的范围内可自由使用和修改。

Crypto++支持多种密码学算法，包括对称加密算法（如AES、DES、RC4）、哈希函数（如SHA-1、SHA-256）、消息认证码（如HMAC）、公钥加密算法（如RSA、DSA、ECC）以及其他密码学功能。

使用Crypto++，您可以在自己的C++应用程序中轻松地集成密码学功能。它提供了面向对象的接口和易于使用的API，使得实现加密和解密操作、生成和验证数字签名、计算哈希值等任务变得相对简单。

官网：Crypto++: Crypto++ Library 8.6 API Reference

github：GitHub - LYingSiMon/cryptopp: free C++ class library of cryptographic schemes

文档：Crypto++: Crypto++ Library 8.6 API Reference

环境搭建
引入 cryptlib.lib ， 以及所有项目中的头文件

AES 加密测试(ECB 模式为例)

#include <iostream>
 
#include "cryptlib.h"
#include "rijndael.h"
#include "modes.h"
#include "files.h"
#include "osrng.h"
#include "hex.h"
#include "base64.h"
 
using namespace CryptoPP;
 
// aes ebc 加密(输出 base64)
std::string aes_encrypt_ecb_base64(std::string data , unsigned char* key, int keylen)
{
    std::string encrypt_str;
 
    try 
    {
        CryptoPP::ECB_Mode<CryptoPP::AES>::Encryption ecb_encription(key, keylen);
        CryptoPP::StreamTransformationFilter stf_encription(
            ecb_encription,
            new CryptoPP::Base64Encoder(new CryptoPP::StringSink(encrypt_str)),
            CryptoPP::BlockPaddingSchemeDef::ZEROS_PADDING
        );
        stf_encription.Put(reinterpret_cast<const unsigned char*>(data.c_str()), data.length() + 1);
        stf_encription.MessageEnd();
    }
    catch (std::exception e) {
        std::cout << e.what() << std::endl;
    }
 
    return encrypt_str;
}
 
// aes ebc 加密(输出 hex) 
std::string aes_encrypt_ecb_hex(std::string data , unsigned char* key, int keylen)
{
    std::string encrypt_str;
 
    try 
    {
        CryptoPP::ECB_Mode<CryptoPP::AES>::Encryption ecb_encription(key, keylen);
        CryptoPP::StreamTransformationFilter stf_encription(
            ecb_encription,
            new CryptoPP::HexEncoder(new CryptoPP::StringSink(encrypt_str)),
            CryptoPP::BlockPaddingSchemeDef::ZEROS_PADDING
        );
        stf_encription.Put(reinterpret_cast<const unsigned char*>(data.c_str()), data.length() + 1);
        stf_encription.MessageEnd();
    }
    catch (std::exception e) {
        std::cout << e.what() << std::endl;
    }
 
    return encrypt_str;
}
 
// aes ebc 解密(输出 base64)
std::string aes_decrypt_ecb_base64(std::string base64_data, unsigned char* key, int keylen)
{
    try 
    {
        std::string aes_encrypt_data;
        CryptoPP::Base64Decoder decoder;
        decoder.Attach(new CryptoPP::StringSink(aes_encrypt_data));
        decoder.Put(reinterpret_cast<const unsigned char*>(base64_data.c_str()), base64_data.length());
        decoder.MessageEnd();
 
        std::string decrypt_data;
        CryptoPP::ECB_Mode<CryptoPP::AES>::Decryption ebc_description(key, keylen);
        CryptoPP::StreamTransformationFilter stf_description(
            ebc_description,
            new CryptoPP::StringSink(decrypt_data), 
            CryptoPP::BlockPaddingSchemeDef::ZEROS_PADDING
        );
 
        stf_description.Put(
            reinterpret_cast<const unsigned char*>(aes_encrypt_data.c_str()), 
            aes_encrypt_data.length()
        );
        stf_description.MessageEnd();
 
        return decrypt_data;
    }
    catch (std::exception e) {
        std::cout << e.what() << std::endl;
        return "";
    }
}
 
// aes ebc 解密(输出 hex)
std::string aes_decrypt_ecb_hex(std::string hex_data, unsigned char* key, int keylen)
{
    try
    {
        std::string aes_encrypt_data;
        CryptoPP::HexDecoder decoder;
        decoder.Attach(new CryptoPP::StringSink(aes_encrypt_data));
        decoder.Put(reinterpret_cast<const unsigned char*>(hex_data.c_str()), hex_data.length());
        decoder.MessageEnd();
 
        std::string decrypt_data;
        CryptoPP::ECB_Mode<CryptoPP::AES>::Decryption ebc_description(key, keylen);
        CryptoPP::StreamTransformationFilter stf_description(
            ebc_description,
            new CryptoPP::StringSink(decrypt_data),
            CryptoPP::BlockPaddingSchemeDef::ZEROS_PADDING
        );
 
        stf_description.Put(
            reinterpret_cast<const unsigned char*>(aes_encrypt_data.c_str()),
            aes_encrypt_data.length()
        );
        stf_description.MessageEnd();
 
        return decrypt_data;
    }
    catch (std::exception e) {
        std::cout << e.what() << std::endl;
        return "";
    }
}
 
 
int main()
{
    // ebc base64 
    std::string en_base64 = aes_encrypt_ecb_base64("hello cryptopp",(unsigned char*)"1234567812345678", 16);
    printf("en:%s \n", en_base64.c_str());
    std::string de_base64 = aes_decrypt_ecb_base64(en_base64, (unsigned char*)"1234567812345678", 16);
    printf("de:%s \n", de_base64.c_str());
 
    // ebc hex
    std::string en_hex = aes_encrypt_ecb_hex("hello cryptopp", (unsigned char*)"1234567812345678", 16);
    printf("en:%s \n", en_hex.c_str());
    std::string de_hex = aes_decrypt_ecb_hex(en_hex, (unsigned char*)"1234567812345678", 16);
    printf("de:%s \n", de_hex.c_str());
    
 
 
    (void)getchar();
    return 0;
}