CryptoX 🔐

A high-performance CLI-based file encryptor for Windows, built in C using OpenSSL (AES-256-GCM).

CryptoX is designed to silently and efficiently encrypt files using multithreading, making it suitable for batch processing and automation workflows where minimal user interaction is required.

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⭐ Support This Project

If you find this project useful, consider giving it a ⭐ on GitHub — it helps others discover it and motivates further development!

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✨ Features

• 🖥️ Command-line (CLI) tool — lightweight and scriptable
• 🤫 Silent operation (minimal output unless attached to console)
• 🔒 AES-256-GCM encryption (OpenSSL)
• ⚡ Multithreaded processing (auto scales with CPU cores)
• 📁 Recursive directory scanning
• 📦 Handles large files efficiently
• 🧠 Partial encryption for huge files (improves speed)
• 🧹 Secure file wiping before deletion
• 🔑 Random key generation
• 📄 Tracks encrypted files in files_list.txt
• 🔁 Full decryption support

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🛠️ Requirements

• Windows OS
• C compiler (MSVC / MinGW)
• OpenSSL library

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🔧 Build Instructions

Using MinGW (example):

gcc cryptox.c -o cryptox.exe -lssl -lcrypto -lws2_32

Using MSVC (example):

cl cryptox.c /I <openssl_include_path> /link /LIBPATH:<openssl_lib_path> libcrypto.lib libssl.lib

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🚀 Usage

cryptox.exe [options] <path1> [path2] ...

Options

Option	Description
-k <hex_key>	64 hex characters (32 bytes) AES-256 key
-o <dir>	Output directory for files_list.txt and key.txt
-g	Generate a random key and save it
-d <list>	Decrypt mode using files_list.txt
-h	Show help

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🔑 Key Generation

cryptox.exe -g -o C:\Output

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🔒 Encryption

cryptox.exe -k <your_hex_key> -o C:\Output C:\MyFolder

• Files are encrypted silently in the background
• Encrypted files get .encrypted extension
• Originals are securely wiped and deleted
• Encrypted file paths are stored in files_list.txt

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🔓 Decryption

cryptox.exe -d C:\Output\files_list.txt -k <your_hex_key>

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🧠 How It Works

• Uses AES-256-GCM with a random IV per file

• IV is stored at the beginning of each encrypted file

• Multithreaded worker system processes files in parallel

• Large files:

  • Only first portion is encrypted (configurable threshold)
  • Remaining data is appended unencrypted for performance

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⚠️ Important Notes

• ⚠️ KEEP YOUR KEY SAFE — without it, data cannot be recovered
• ⚠️ Decryption will fail if the wrong key is used
• ⚠️ Original files are permanently deleted after encryption
• ⚠️ Designed for silent, automated CLI usage

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📁 Output Files

• key.txt → Encryption key (if generated)
• files_list.txt → List of encrypted files

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🧪 Example Workflow

# Generate key
cryptox.exe -g -o C:\Output

# Encrypt files
cryptox.exe -k <key> -o C:\Output C:\MyFolder

# Decrypt later
cryptox.exe -d C:\Output\files_list.txt -k <key>

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⚡ Performance

• Uses up to 64 threads (based on CPU cores)
• Processes files in chunks (64 KB)
• Efficient for both small and very large datasets

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📜 License

This project is provided as-is for educational and legitimate use cases.

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⚠️ Disclaimer

This software performs irreversible file deletion after encryption. Use responsibly. The author is not responsible for data loss or misuse.

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