cryptopals

aes_in_cbc_mode.py (464B)

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 from Crypto.Cipher import AES
 
 file = open('files/10.txt') .read().decode("base64")
 
 split_file = [file[i:i + AES.block_size] for i in range(0, len(file), AES.block_size)]
 key = "YELLOW SUBMARINE"
 aes = AES.new(key, AES.MODE_ECB)
 iv = ''.join(['x00' for i in range(AES.block_size)])
 plaintext = ""
 
 for cipher_text in split_file:
     plaintext += ''.join([chr(ord(a) ^ ord(b)) for a, b in zip(iv, aes.decrypt(cipher_text))])
     iv = cipher_text
 
 print plaintext