编辑aes128加解密代码 c语言

AES（Advanced Encryption Standard）是一种高级加密标准，常用于保护数据的安全传输。在C语言中使用AES-128进行加解密，通常需要依赖外部库，如OpenSSL或者Crypto++，因为AES本身是一个复杂的算法，不适合直接嵌入到核心代码中。

以下是一个简单的示例，展示了如何使用OpenSSL库来进行AES-128-CBC模式的加解密：

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

// AES-128 key and IV (16 bytes each)
const unsigned char myKey[] = { 'K', 'e', 'y', '1', '2', '3', '4', '5',
                                '6', '7', '8', '9', '0', 'A', 'B', 'C' };
const unsigned char myIV[]   = { 'I', 'V', '1', '2', '3', '4', '5', '6',
                                '7', '8', '9', '0', 'A', 'B', 'C', 'D' };

void aes_encrypt(unsigned char *input, size_t len, const unsigned char *key,
                 const unsigned char *iv) {
    AES_KEY aes_key;
    AES_set_encrypt_key(key, 128, &aes_key); // 128 bits for AES-128
    unsigned char output[len];
    AES_cbc_encrypt(input, output, len, &aes_key, iv, AES_ENCRYPT);
    // Write encrypted data to another buffer or file
}

void aes_decrypt(unsigned char *input, size_t len, const unsigned char *key,
                 const unsigned char *iv) {
    AES_KEY aes_key;
    AES_set_decrypt_key(key, 128, &aes_key); // 128 bits for AES-128
    unsigned char output[len];
    AES_cbc_encrypt(input, output, len, &aes_key, iv, AES_DECRYPT);
    // Read decrypted data from the buffer or file and compare with original
}

int main() {
    unsigned char plaintext[] = "Hello, World!";
    size_t plaintext_len = strlen(plaintext);
    unsigned char ciphertext[plaintext_len]; // Room for encryption

    aes_encrypt(plaintext, plaintext_len, myKey, myIV);

    // Now you can write ciphertext to a file or send it over network.

    // To decrypt:
    unsigned char decryptedtext[plaintext_len];
    aes_decrypt(ciphertext, plaintext_len, myKey, myIV);
    printf("Decrypted: %s\n", decryptedtext);

    return 0;
}

注意：这只是一个基本示例，实际使用时你需要处理错误、输入验证以及文件操作等。此外，AES的CBC模式需要一个初始化向量（IV），通常在每次加密前随机生成并妥善保存。