Encrypt and decrypt files and streams in AES Crypt format (version 2)
pyAesCrypt is a Python 3 file-encryption module and script that uses AES256-CBC to encrypt/decrypt files and binary streams.
It is Free Software, released under the Apache License, Version 2.0.
pyAesCrypt is brought to you by Marco Bellaccini - marco.bellaccini(at!)gmail.com.
IMPORTANT SECURITY NOTE: version 2 of the AES Crypt file format does not authenticate the “file size modulo 16” byte. This implies that an attacker with write access to the encrypted file may alter the corresponding plaintext file size by up to 15 bytes.
NOTE: there is no low-level memory management in Python, hence it is not possible to wipe memory areas were sensitive information was stored.
Module usage example
Here is an example showing encryption and decryption of a file:
import pyAesCrypt # encryption/decryption buffer size - 64K bufferSize = 64 * 1024 password = "foopassword" # encrypt pyAesCrypt.encryptFile("data.txt", "data.txt.aes", password, bufferSize) # decrypt pyAesCrypt.decryptFile("data.txt.aes", "dataout.txt", password, bufferSize)
This is the most straightforward way to use pyAesCrypt, and should be preferred.
In case you need it, you can work with binary streams too:
import pyAesCrypt from os import stat, remove # encryption/decryption buffer size - 64K bufferSize = 64 * 1024 password = "foopassword" # encrypt with open("data.txt", "rb") as fIn: with open("data.txt.aes", "wb") as fOut: pyAesCrypt.encryptStream(fIn, fOut, password, bufferSize) # get encrypted file size encFileSize = stat("data.txt.aes").st_size # decrypt with open("data.txt.aes", "rb") as fIn: try: with open("dataout.txt", "wb") as fOut: # decrypt file stream pyAesCrypt.decryptStream(fIn, fOut, password, bufferSize, encFileSize) except ValueError: # remove output file on error remove("dataout.txt")
you can also perform in-memory encryption/decryption (using BytesIO):
import pyAesCrypt import io bufferSize = 64 * 1024 password = "foopassword" # binary data to be encrypted pbdata = b"This is binary plaintext \x00\x01" # input plaintext binary stream fIn = io.BytesIO(pbdata) # initialize ciphertext binary stream fCiph = io.BytesIO() # initialize decrypted binary stream fDec = io.BytesIO() # encrypt stream pyAesCrypt.encryptStream(fIn, fCiph, password, bufferSize) # print encrypted data print("This is the ciphertext:\n" + str(fCiph.getvalue())) # get ciphertext length ctlen = len(fCiph.getvalue()) # go back to the start of the ciphertext stream fCiph.seek(0) # decrypt stream pyAesCrypt.decryptStream(fCiph, fDec, password, bufferSize, ctlen) # print decrypted data print("Decrypted data:\n" + str(fDec.getvalue()))
Script usage examples
Encrypt file test.txt in test.txt.aes:
pyAesCrypt -e test.txt
Decrypt file test.txt.aes in test.txt:
pyAesCrypt -d test.txt.aes
Encrypt file test.txt in test2.txt.aes:
pyAesCrypt -e test.txt -o test2.txt.aes
Decrypt file test.txt.aes in test2.txt:
pyAesCrypt -d test.txt.aes -o test2.txt
Is pyAesCrypt malware?
NO! Of course it isn’t!
Nevertheless, being a module, it can be used by any other software, including malware.
In fact, it has been reported that it is used as crypto library by some ransomware.
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