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