gistfile1.py

def decrypt_and_compare(data, key, iv, expected):
  unpad = lambda s: s[0:-ord(s[-1])]
  aes = Crypto.Cipher.AES.new(key, Crypto.Cipher.AES.MODE_CBC, iv)
  
  # Decrypt each block of data, except for the last one
  for i in xrange(0, len(data) - 16, 16):
    if aes.decrypt(data[i:i+16]) != expected[i:i+16]:
      return False
  
  # Decrypt the last block of data, unpad, and compare
  decrypted = unpad(aes.decrypt(data[-16:]))
  return len(decrypted) == 0 or decrypted == expected[-16:]