A simple AES-based file encryption and decryption module in Python with password-based key generation. Supports encrypting and decrypting any file using a password entered from the command line.

• AES encryption (CFB mode)
• Password-based key derivation (PBKDF2HMAC + SHA256)
• Modular code: utils.py handles encryption/decryption logic
• CLI-based usage for files
• Supports any file type (images, documents, etc.)

File_Encryption_Decryption/
├── encryptor.py        # CLI tool to encrypt files
├── decryptor.py        # CLI tool to decrypt files
├── utils.py            # Encryption/decryption helper functions
├── requirements.txt    # Dependencies
└── sample.jpg          # Test file

1. Clone the repository:

git clone https://github.com/haragam22/Code_Script
cd Code_Script/Python/File_Encryption_Decryption

2. Create a virtual environment:

python -m venv venv

3. Activate the virtual environment:

# Windows
venv\Scripts\activate

# macOS/Linux
source venv/bin/activate

4. Install dependencies:

pip install -r requirements.txt

python encryptor.py <file_path>

Example:

python encryptor.py sample.jpg

• Enter a password when prompted.
• Creates an encrypted file: sample.jpg.enc.

python decryptor.py <encrypted_file>

Example:

python decryptor.py sample.jpg.enc

• Enter the same password used for encryption.
• Restores the original file: sample.jpg.

• generate_key(password: str, salt: bytes = None) -> tuple[bytes, bytes] Generates a 256-bit AES key from a password using PBKDF2HMAC. Returns (key, salt).

• encrypt_data(key: bytes, plaintext: bytes) -> bytes Encrypts bytes using AES (CFB mode) and prepends IV.

• decrypt_data(key: bytes, ciphertext: bytes) -> bytes Decrypts bytes using AES (CFB mode). Expects IV prepended.