AES-128 encryption | Usage:
-k, --key-len mention the key length in bytes, possible options are 16, 24 or 32.
-m, --mode mention the procedure, either 'encrypt' or 'decrypt' without quotes.
-f, --file provide the filename with relative/absolute path to encrypt/decrypt it.
not to be used with: -h, --hex, -c, --console.
-c, --console encrypt/decrypt ASCII plaintext through console.
not to be used with: -f, --file.
-h, --hex when in console mode, output encrypted bytes and input to decrypt bytes in hexadecimal string.
to be used with: -c or --console.
not to be used with: -f, --file.
For example, to encrypt a file.ext with a 128 bits key, execute
./aes.py -m encrypt -f file.ext -k 16
and input the key after the console prompt. file.ext will be changed (overwritten, encrypted).
Similarly to decrypt the encrypted file file.ext with the same key, execute
./aes.py -m decrypt -f file.ext -k 16
and input the key like before.
You must make aes.py to be executable to execute the previous commands.
chmod +x aes.py
If you don't want to do that however, add python3 to the prefix of those encryption and decryption commands.
Don't pull the following stunt:
./aes.py -m encrypt -f aes.py
This script doesn't keep info over which files are encrypted, which are not. So, a single file can very well be encrypted multiple times, with different keys. Make sure to decrypt them in a reverse manner. Also, make sure not to decrypt a non-encrypted file. (The behaviour is untested.)