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在實(shí)時聊天應(yīng)用中,使用WebSocket庫可以實(shí)現(xiàn)客戶端與服務(wù)器之間的實(shí)時通信。為了確保消息的安全性和隱私,你需要對消息進(jìn)行加密和解密。以下是一個使用C++ WebSocket庫(例如:websocketpp
)實(shí)現(xiàn)消息加密與解密的示例:
websocketpp
庫。如果沒有安裝,可以使用以下命令安裝:git clone https://github.com/zaphoyd/websocketpp.git
cd websocketpp
mkdir build
cd build
cmake ..
make install
websocketpp
頭文件:#include <websocketpp/config/asio_no_tls.hpp>
#include <websocketpp/server.hpp>
OpenSSL
。確保已經(jīng)安裝了OpenSSL
庫。如果沒有安裝,可以使用以下命令安裝:sudo apt-get install libssl-dev
OpenSSL
頭文件:#include<openssl/aes.h>
#include<openssl/rand.h>
class Crypto {
public:
static std::string encrypt(const std::string &plaintext, const unsigned char *key) {
std::string ciphertext;
ciphertext.resize(plaintext.size() + AES_BLOCK_SIZE);
AES_KEY aesKey;
AES_set_encrypt_key(key, 256, &aesKey);
unsigned char iv[AES_BLOCK_SIZE];
RAND_bytes(iv, AES_BLOCK_SIZE);
int outlen = 0;
AES_cbc_encrypt(reinterpret_cast<const unsigned char *>(plaintext.data()),
reinterpret_cast<unsigned char *>(&ciphertext[0]),
plaintext.size(), &aesKey, iv, AES_ENCRYPT);
ciphertext.insert(0, reinterpret_cast<char *>(iv), AES_BLOCK_SIZE);
return ciphertext;
}
static std::string decrypt(const std::string &ciphertext, const unsigned char *key) {
std::string plaintext;
plaintext.resize(ciphertext.size() - AES_BLOCK_SIZE);
AES_KEY aesKey;
AES_set_decrypt_key(key, 256, &aesKey);
const unsigned char *iv = reinterpret_cast<const unsigned char *>(ciphertext.data());
AES_cbc_encrypt(reinterpret_cast<const unsigned char *>(ciphertext.data()) + AES_BLOCK_SIZE,
reinterpret_cast<unsigned char *>(&plaintext[0]),
ciphertext.size() - AES_BLOCK_SIZE, &aesKey, iv, AES_DECRYPT);
return plaintext;
}
};
Crypto
類加密和解密收發(fā)的消息:typedef websocketpp::server<websocketpp::config::asio> server;
void on_message(server *s, websocketpp::connection_hdl hdl, server::message_ptr msg) {
std::string encrypted_msg = msg->get_payload();
std::string decrypted_msg = Crypto::decrypt(encrypted_msg, your_key);
// 處理解密后的消息
// ...
std::string response_msg = "Your response message";
std::string encrypted_response = Crypto::encrypt(response_msg, your_key);
s->send(hdl, encrypted_response, websocketpp::frame::opcode::text);
}
這樣,你就可以在實(shí)時聊天應(yīng)用中使用C++ WebSocket庫實(shí)現(xiàn)消息的加密與解密了。請注意,這里的示例僅用于演示目的,實(shí)際應(yīng)用中可能需要根據(jù)你的需求進(jìn)行調(diào)整。
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