Source code for file_encryptor.convergence
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# The MIT License (MIT)
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# Copyright (c) 2014 Storj Labs
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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from Crypto.Cipher import AES
from Crypto.Util import Counter
from file_encryptor.settings import CHUNK_SIZE
from file_encryptor import key_generators
[docs]def encrypt_file_inline(filename, passphrase):
"""Encrypt file inline, with an optional passphrase.
If you set the passphrase to None, a default is used.
This will make you vulnerable to confirmation attacks
and learn-partial-information attacks.
:param filename: The name of the file to encrypt.
:type filename: str
:param passphrase: The passphrase used to decrypt the file.
:type passphrase: str or None
:returns: The key required to decrypt the file.
:rtype: str
"""
key = key_generators.key_from_file(filename, passphrase)
inline_transform(filename, key)
return key
[docs]def decrypt_file_inline(filename, key):
"""Decrypt file inline with given key.
The given key must be the same that was
returned by encrypt_file_inline.
:param filename: The name of the file to decrypt.
:type filename: str
:param key: The key used to decrypt the file.
:type key: str
"""
inline_transform(filename, key)
[docs]def decrypt_generator(filename, key):
"""Stream decrypted file with given key.
The given key must be the same that was
returned by encrypt_file_inline.
:param filename: The name of the file to decrypt.
:type filename: str
:param key: The key used to decrypt the file.
:type key: str
:returns: A generator that streams decrypted file chunks.
:rtype: generator
"""
for chunk, _ in iter_transform(filename, key):
yield chunk