纯C语言实现基于AES算法的加密，从文件每次读取16个字节加密后写入指定文件中，同时把源文件大小和密钥做异或写入加密文件中。-Pure C language based on the AES algorithm encryption, encrypted each read 16 bytes written to the specified file from the file, while the size of the source file and the key is to do XOR write encrypted files.