python-aes

A python implementation of AES

Developed by Ryan Burrow for VT MATH4175, Cryptography 1.

This program runs on python3. It may work with python2, but I haven't tested it.

The initial modules I created for this implementation used string manipulation.
I am too stuborn to go back and change them to be more efficient and easier.
I have many regrets.
I may come back and change this at a later time.

usage: python3 [-O] aes_main.py [-h] [-f input_file] [-o output_file] [-d] [-b] [-c]
                    key_file

Encrypt or Decrypt a file with AES128, AES192, or AES256. Run with -O flag to
enable debugging

positional arguments:
  key_file        The file storing the 128, 192, or 256 bit key as text

optional arguments:
  -h, --help      show this help message and exit
  -f input_file   The file storing the text to be (en/de)crypted.
                  If not used, input must come from stdin.
                  If a newline character is reached without the -b flag,
                  the program will treat it like an EOF
  -o output_file  The file to store the (en/de)crypted text in.
                  If not used, output will go to stdout.
  -d              Decrypt the file instead of encrypting.
  -b              Read and write files as bytes. (Not yet implemented).
                  If not set, read and write characters as hex values.
  -c              CBC mode. IV is set to zero (this may be changed
                  in the future).
                  If not used, ECB mode will be used.

testFiles.sh is used to verify the code works as expected.
It expects a directory containing 4 files the following naming convention:

1. *plaintext*
2. *cipher*-cbc*
3. *cipher*-ecb*
4. *key*