MFC: 文件加解密（单元测试模块）

背景：

1. 对敏感配置文件（如 XML 格式的配置文件、用户信息等）进行加密，防止被人以文本形式直接查看。
2. 软件启动前加载加密的配置或资源文件，运行时再进行解密使用，提高逆向破解门槛。
3. 在传输 XML 文件（如通过网络发送）前进行加密，保障数据在传输过程中的安全性。

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

void AESEncrypt(const unsigned char *inputData, size_t dataSize, unsigned char *outputData, const unsigned char *key) {
    AES_KEY aesKey;
    AES_set_encrypt_key(key, 256, &aesKey);

    size_t numBlocks = dataSize / 16;

    for (size_t i = 0; i < numBlocks; ++i) {
        AES_ecb_encrypt(inputData + i * 16, outputData + i * 16, &aesKey, AES_ENCRYPT);
    }
}

void AESDecrypt(const unsigned char *inputData, size_t dataSize, unsigned char *outputData, const unsigned char *key) {
    AES_KEY aesKey;
    AES_set_decrypt_key(key, 256, &aesKey);

    size_t numBlocks = dataSize / 16;

    for (size_t i = 0; i < numBlocks; ++i) {
        AES_ecb_encrypt(inputData + i * 16, outputData + i * 16, &aesKey, AES_DECRYPT);
    }
}

int main() {
   unsigned char key[32] = "1234567890abcdef1234567890abcdef";  // 32 字节

    // Read the XML file
    const char *filePath = "path_to_your_xml_file.xml";
    FILE *file = fopen(filePath, "rb");
    if (!file) {
        perror("File open error");
        return 1;
    }

    fseek(file, 0, SEEK_END);
    long fileSize = ftell(file);
    fseek(file, 0, SEEK_SET);

    unsigned char *originalData = (unsigned char *)malloc(fileSize);
    fread(originalData, 1, fileSize, file);
    fclose(file);

    // Allocate memory for encrypted data
    unsigned char *encryptedData = (unsigned char *)malloc(fileSize);

    AESEncrypt(originalData, fileSize, encryptedData, key);

    // Write encrypted data back to the file
    file = fopen(filePath, "wb");
    if (!file) {
        perror("File open error");
        return 1;
    }
    fwrite(encryptedData, 1, fileSize, file);
    fclose(file);

    // Clean up
    free(originalData);
    free(encryptedData);

    return 0;
}