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import pickle
from Crypto.Cipher import AES
from base64 import b64encode, b64decode
__all__ = "encrypt", "decrypt"
BLOCK_SIZE = 16
INTERRUPT = b'\0' # something impossible to put in a string
PADDING = b'\1'
def pad(data):
return data + INTERRUPT + PADDING * (BLOCK_SIZE - (len(data) + 1) % BLOCK_SIZE)
def strip(data):
return data.rstrip(PADDING).rstrip(INTERRUPT)
def create_cipher(key, seed):
if len(seed) != 16:
raise ValueError("Choose a seed of 16 bytes")
if len(key) != 32:
raise ValueError("Choose a key of 32 bytes")
return AES.new(key, AES.MODE_CBC, seed)
def encrypt(plaintext_data, key, seed):
plaintext_data = pickle.dumps(plaintext_data, pickle.HIGHEST_PROTOCOL) # whatever you give me I need to be able to restitute it
return b64encode(create_cipher(key, seed).encrypt(pad(plaintext_data)))
def decrypt(encrypted_data, key, seed):
return pickle.loads(strip(create_cipher(key, seed).decrypt(b64decode(encrypted_data))))
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