AES128C代码

以下是使用AES128C加密的代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/aes.h>
#include <openssl/rand.h>

#define AES_KEY_LENGTH 128

int main()
{
    unsigned char key[AES_KEY_LENGTH/8];
    unsigned char iv[AES_BLOCK_SIZE];

    // 生成随机密钥和IV
    RAND_bytes(key, sizeof(key));
    RAND_bytes(iv, sizeof(iv));

    // 声明AES加密上下文
    AES_KEY aes_key;

    // 初始化加密上下文
    AES_set_encrypt_key(key, AES_KEY_LENGTH, &aes_key);

    // 明文
    unsigned char plaintext[] = "Hello World!";

    // 计算明文长度并分配加密缓冲区
    int plaintext_len = strlen((char *)plaintext);
    int ciphertext_len = ((plaintext_len + AES_BLOCK_SIZE - 1) / AES_BLOCK_SIZE) * AES_BLOCK_SIZE;
    unsigned char *ciphertext = (unsigned char *)malloc(ciphertext_len);

    // AES加密
    AES_cbc_encrypt(plaintext, ciphertext, plaintext_len, &aes_key, iv, AES_ENCRYPT);

    // 输出密文
    printf("Ciphertext: ");
    for(int i=0; i<ciphertext_len; i++)
        printf("%02x", ciphertext[i]);
    printf("\n");

    // 释放加密缓冲区
    free(ciphertext);

    return 0;
}

注意，此示例使用OpenSSL库进行AES加密。在使用前，确保已正确安装和配置OpenSSL库。