用Python写一个批量文件加密算法

当然，我可以帮你完成这个问题。你需要使用python中的pycryptodome库来实现批量文件加密。下面是一个简单的实现：

from Crypto.Cipher import AES
import os

def encrypt_file(key, in_filename, out_filename=None, chunksize=64*1024):
    if not out_filename:
        out_filename = in_filename + '.enc'

    iv = os.urandom(16)
    encryptor = AES.new(key, AES.MODE_CBC, iv)

    filesize = os.path.getsize(in_filename)

    with open(in_filename, 'rb') as infile:
        with open(out_filename, 'wb') as outfile:
            outfile.write(filesize.to_bytes(8, byteorder='big'))
            outfile.write(iv)

            while True:
                chunk = infile.read(chunksize)
                if len(chunk) == 0: # 文件末尾
                    break
                elif len(chunk) % 16 != 0:
                    chunk += b' ' * (16 - len(chunk) % 16)

                outfile.write(encryptor.encrypt(chunk))

def encrypt_files_in_folder(key, folder_path):
    for folder_name, subfolders, filenames in os.walk(folder_path):
        for filename in filenames:
            in_file_path = os.path.join(folder_name, filename)
            encrypt_file(key, in_file_path)
            os.remove(in_file_path) # 加密后删除原文件

上面的代码使用AES算法对文件进行加密，加密模式为CBC，加密后的文件名为原文件名加上".enc"后缀。你可以使用`encrypt_file(key, in_filename, out_filename)`函数来对单个文件进行加密，也可以使用`encrypt_files_in_folder(key, folder_path)`函数来批量加密一个目录下的所有文件。其中`key`是加密密钥，可以是任意长度的bytes类型。