File Encryption/Decryption System

C++ utility for AES-256 file encryption/decryption using OpenSSL.

Features

• AES-256-CBC encryption using OpenSSL
• Recursive directory encryption/decryption
• Parallel task execution
• Handles PKCS#7 padding during encryption
• Truncates extra padding bytes after decryption
• Configurable via a .env file

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Requirements

• C++17-compatible compiler (GCC / Clang)
• OpenSSL 1.1.1 or newer
• Linux or macOS

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Installation

Clone the repository and build:

git clone https://github.com/yourusername/file-encryption
cd file-encryption
make

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Configuration

Create a .env file in the root directory with a 32-byte encryption key:

MYSECRETKEY1234567890ABCDEF12345678

• The key must be exactly 32 characters for AES-256.

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Usage

Run the built application:

./bin/FileVault

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Security Notes

• Key Handling: The encryption key is loaded from .env. Never commit it to version control.

• IV Usage: This version uses a static IV (all zeroes) for demonstration. In production, use a random IV per encryption, stored alongside the ciphertext.

• Backups: Always maintain backups of original files before encryption or decryption.