fileenc-openssl 1.2.4

allows one to easily encrypt and decrypt files symmetrically using openssl and python3

fileenc-openssl

This code allows one to easily encrypt and decrypt files symmetrically using openssl and python3.

• Uses aes-256-cbc for file encryption (as implemented by openssl)

• Uses a salt when encrypting (to avoid pre-computation or rainbow tables).

• Uses sha256 key stretching (with <0.1s) to make brute force prohibitively expensive.

• Uses sha256 checksum to check file integrity.

Installation

You can install using

pip install fileenc-openssl

If you want fileenc and filedec available system-wide, use sudo or equivalent.

Usage

From command line:

fileenc --key 'password123' --input '*.png' --check --overwrite
filedec --key 'password123' --input '*.png.enc' --check --overwrite --remove
# the quotes around wildcards are important

From python:

from fileenc_openssl import stretch_key, encrypt_file, decrypt_file
stretched_key = stretch_key('password123')
enc_pth = encrypt_file(raw_pth, key=stretched_key)
res_pth = decrypt_file(enc_pth, key=stretched_key)

Testing (needs py.test):

py.test

Options

You can find all options using fileenc --help:

-h, --help              show this help message and exit
-k KEY, --key KEY       the key to use for encryption; you will be prompted for one if this is not provided (more secure)
-i INP, --input INP     input file, directory or pattern (as a single string) (.enc will be appended)
-o OUTP, --output OUTP  optionally, output file or directory (.enc will be stripped if available)
-d, --decrypt           decrypt the input file(s) (as opposed to encrypt, which is the default)
-f, --overwrite         overwrite existing files when decrypting (encrypting always overwrites)
-r, --remove            remove the input file after en/decrypting (after --check)
-c, --check             test the encryption by reversing it (abort on failure) (only for ENcryption due to salting)

License

Revised BSD License; at your own risk, you can mostly do whatever you want with this code, just don’t use my name for promotion and do keep the license file.