brachinus 1.0.0

AES-256 CBC file encryption library with support for individual files and directory batch operations.

brachinus

AES-256 CBC file encryption library with support for individual files and directory batch operations.

Supports single-file and directory batch operations + command-line usage

Brachinus is a simple, secure, and feature-rich AES-256 encryption library for Python.
It supports password-based key derivation, random binary keys, file/directory encryption, and includes a built-in CLI interface.

---

Features

• AES-256 encryption (CBC mode)
• PBKDF2 key derivation (100k iterations)
• Automatic IV generation
• Salt + IV metadata stored in output file
• File and directory encryption/decryption
• Optional extension filtering
• Key saving/loading utilities
• Built-in command-line interface (CLI)

---

Installation

Install:

pip install brachinus

Or install from source:

git clone https://github.com/JuanBindez/brachinus
cd brachinus
pip install .

---

Usage (Python API)

Encrypt a file with a password

from brachinus import encrypt_file_with_password

encrypt_file_with_password("example.txt", "mypassword")

Creates:

example.txt.enc

---

Decrypt a file

from brachinus import decrypt_file_with_password

decrypt_file_with_password("example.txt.enc", "mypassword")

---

Using the AES256 Class Directly

With a password

from brachinus import AES256

aes = AES256(password="mypassword")
aes.encrypt_file("data.pdf")
aes.decrypt_file("data.pdf.enc")

With a random binary key

aes = AES256()  # generates a new random key
print(aes.key)

Key save/load

aes.save_key("aes.key")
loaded = AES256.load_from_keyfile("aes.key")

---

Directory Encryption

Encrypt all files

aes.encrypt_directory("myfolder")

Produces:

myfolder_encrypted/

Encrypt only specific extensions

aes.encrypt_directory("photos", extensions=[".jpg", ".png"])

---

Directory Decryption

aes.decrypt_directory("myfolder_encrypted")

Creates:

myfolder_encrypted_decrypted/

---

Key Information

info = aes.get_key_info()
print(info)

Example:

{
    "key": "...",
    "key_hex": "a4f5...",
    "salt": "...",
    "salt_hex": "d2ab...",
    "key_type": "password-derived"
}

---

Internal Encrypted File Format

[4 bytes salt_length] [salt (if present)] [16-byte IV] [encrypted_data]

• Salt only stored for password-derived keys
• IV always present
• Ensures reproducible decryption

---

Command Line Interface (CLI)

Brachinus includes a terminal command: brachinus

After installation you can run:

brachinus --help

---

CLI Commands

Encrypt a file

brachinus encrypt-file input.txt

Encrypt a file with password

brachinus encrypt-file input.txt --password "mypassword"

Decrypt a file

brachinus decrypt-file input.txt.enc --password "mypassword"

Encrypt a directory

brachinus encrypt-dir myfolder --password "mypassword"

Decrypt a directory

brachinus decrypt-dir myfolder_encrypted --password "mypassword"

Use a keyfile instead of password

brachinus encrypt-file document.pdf --keyfile aes.key

---

Security Notes

⚠️ Use strong passwords
⚠️ Never reuse password + salt manually
⚠️ Keep .key files secure
⚠️ Lost passwords or keys cannot be recovered

---