C++怎么进行数据加密 C++数据加密的常用算法与实现

#include <iostream>
#include <openssl/aes.h>
#include <openssl/rand.h>
#include <string>
#include <vector>

std::vector<unsigned char> aes_encrypt(const std::string& plaintext, const std::vector<unsigned char>& key, const std::vector<unsigned char>& iv) {
    std::vector<unsigned char> ciphertext(plaintext.size());
    AES_KEY aes_key;
    AES_set_encrypt_key(key.data(), key.size() * 8, &aes_key); // Key size in bits
    AES_cbc_encrypt((const unsigned char*)plaintext.data(), ciphertext.data(), plaintext.size(), &aes_key, iv.data(), AES_ENCRYPT);
    return ciphertext;
}

std::string aes_decrypt(const std::vector<unsigned char>& ciphertext, const std::vector<unsigned char>& key, const std::vector<unsigned char>& iv) {
    std::string plaintext(ciphertext.size(), '\0');
    AES_KEY aes_key;
    AES_set_decrypt_key(key.data(), key.size() * 8, &aes_key);
    AES_cbc_encrypt(ciphertext.data(), (unsigned char*)plaintext.data(), ciphertext.size(), &aes_key, iv.data(), AES_DECRYPT);
    return plaintext;
}

int main() {
    std::string plaintext = "This is a secret message.";
    std::vector<unsigned char> key(16); // 128-bit key
    std::vector<unsigned char> iv(AES_BLOCK_SIZE); // Initialization vector

    // Generate random key and IV
    RAND_bytes(key.data(), key.size());
    RAND_bytes(iv.data(), iv.size());

    std::vector<unsigned char> ciphertext = aes_encrypt(plaintext, key, iv);
    std::string decrypted_plaintext = aes_decrypt(ciphertext, key, iv);

    std::cout << "Plaintext: " << plaintext << std::endl;
    std::cout << "Ciphertext: ";
    for (unsigned char c : ciphertext) {
        std::cout << std::hex << (int)c;
    }
    std::cout << std::endl;
    std::cout << "Decrypted plaintext: " << decrypted_plaintext << std::endl;

    return 0;
}