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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 fileconst 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 dataunsigned char *encryptedData = (unsigned char *)malloc(fileSize);AESEncrypt(originalData, fileSize, encryptedData, key);// Write encrypted data back to the filefile = fopen(filePath, "wb");if (!file) {perror("File open error");return 1;}fwrite(encryptedData, 1, fileSize, file);fclose(file);// Clean upfree(originalData);free(encryptedData);return 0;
}