SM4加密cbc模式C++可接受输入实现
时间: 2023-11-28 13:04:58 浏览: 41
以下是使用SM4算法加密CBC模式的C++代码示例,可以接受输入实现:
```c++
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#define BLOCK_SIZE 16
int main()
{
// Key and IV setup
unsigned char key[BLOCK_SIZE];
unsigned char iv[BLOCK_SIZE];
RAND_bytes(key, BLOCK_SIZE);
RAND_bytes(iv, BLOCK_SIZE);
// Plaintext and ciphertext buffers
unsigned char plaintext[256];
unsigned char ciphertext[256 + BLOCK_SIZE];
memset(plaintext, 0, sizeof(plaintext));
memset(ciphertext, 0, sizeof(ciphertext));
// Get plaintext from user input
std::cout << "Enter plaintext: ";
std::cin.getline((char*)plaintext, sizeof(plaintext));
// Initialize cipher context
EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new();
if (!ctx) {
std::cerr << "Error initializing cipher context" << std::endl;
return EXIT_FAILURE;
}
// Set cipher type and mode
if (EVP_EncryptInit_ex(ctx, EVP_sm4_cbc(), NULL, key, iv) != 1) {
std::cerr << "Error setting cipher type and mode" << std::endl;
return EXIT_FAILURE;
}
// Encrypt plaintext
int len = 0, ciphertext_len = 0;
if (EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, strlen((const char*)plaintext)) != 1) {
std::cerr << "Error encrypting plaintext" << std::endl;
return EXIT_FAILURE;
}
ciphertext_len = len;
// Finalize encryption
if (EVP_EncryptFinal_ex(ctx, ciphertext + ciphertext_len, &len) != 1) {
std::cerr << "Error finalizing encryption" << std::endl;
return EXIT_FAILURE;
}
ciphertext_len += len;
// Print ciphertext
std::cout << "Ciphertext: ";
for (int i = 0; i < ciphertext_len; ++i) {
printf("%02x", ciphertext[i]);
}
std::cout << std::endl;
// Clean up
EVP_CIPHER_CTX_free(ctx);
return EXIT_SUCCESS;
}
```
该示例使用OpenSSL库实现SM4算法加密CBC模式。用户可以通过标准输入方式输入明文,程序会自动输出加密后的密文。注意:SM4算法只支持128位密钥长度,因此key和iv数组的长度均为16。
相关推荐
![](https://img-home.csdnimg.cn/images/20210720083646.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)