For decrypting, we need to reverse the preceding process to decrypt the file using AES.
You can find the following code in the aes-file-decrypt.py file inside the pycrypto folder:
from Crypto.Cipher import AESfrom Crypto.Hash import SHA256import os, random, structdef decrypt_file(key, filename): chunk_size = 64*1024 output_filename = os.path.splitext(filename)[0] #open the encrypted file and read the file size and the initialization vector. #The IV is required for creating the cipher. with open(filename, 'rb') as infile: origsize = struct.unpack('<Q', infile.read(struct.calcsize('Q')))[0] iv = infile.read(16) #create the cipher using the key and the IV. decryptor = AES.new(key, AES.MODE_CBC, iv) #We also write the ...
