使用以下这两个头文件

#include <openssl/aes.h>

#include <openssl/evp.h>

sudo apt-get install openssl


sudo apt-get install libssl-dev


sudo apt-get install libssl-doc

1、sudo apt-get install openssl

2、 sudo apt-get install libssl-dev

3、sudo apt-get install libssl-doc

4、解密和解密的接口

//编译时，注意加入 -lssl -lcrypto
// gcc ....  -lssl -lcrypto

#include <stdio.h>
#include <openssl/aes.h>
#include <openssl/evp.h>
#include <string.h>
#include "securityCode.h"
//编译时，注意加入 -lssl -lcrypto
// gcc ....  -lssl -lcrypto

// 加密函数
void encrypt(const unsigned char *plaintext, int plaintext_len, const unsigned char *key,
             const unsigned char *iv, unsigned char *ciphertext) {
    EVP_CIPHER_CTX *ctx;

    int len;
    int ciphertext_len;

    ctx = EVP_CIPHER_CTX_new();
    EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv);
    EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len);
    ciphertext_len = len;
    EVP_EncryptFinal_ex(ctx, ciphertext + len, &len);
    ciphertext_len += len;
    EVP_CIPHER_CTX_free(ctx);
}

// 解密函数
void decrypt(const unsigned char *ciphertext, int ciphertext_len, const unsigned char *key,
             const unsigned char *iv, unsigned char *plaintext) {
    EVP_CIPHER_CTX *ctx;

    int len;
    int plaintext_len;

    ctx = EVP_CIPHER_CTX_new();
    EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv);
    EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len);
    plaintext_len = len;
    EVP_DecryptFinal_ex(ctx, plaintext + len, &len);
    plaintext_len += len;
    EVP_CIPHER_CTX_free(ctx);
}