Encrypted File Compression and Extraction Scripts

This repository contains two scripts designed to compress a file, generate an MD5 checksum, and create an encrypted archive that can be extracted using a self-contained extraction script. The scripts are useful for securely distributing files with built-in integrity checks.

Files

• encscript.sh: A Bash script for Linux and macOS systems.
• encscript.ps1: A PowerShell script for Windows systems.

System Requirements

• encscript.sh: Designed for Linux and macOS systems with ar, bzip2, openssl, and md5sum or md5 installed.
• encscript.ps1: Designed for Windows systems with 7z (7-Zip) and CertUtil installed.

How It Works

Both scripts perform the following tasks:

• Compress the Input File: Uses bzip2 (Linux/macOS) or 7z (Windows) to compress the input file.
• Generate an MD5 Checksum: Creates an MD5 checksum for the compressed file to ensure data integrity.
• Create a Temporary Archive: Combines the compressed file and its checksum into a temporary archive.
• Generate an Extraction Script: Creates a self-contained extraction script that includes the base64-encoded content of the temporary archive.

Usage

Step 1: Compress and Encrypt a File

1. Run the script with the file you want to compress and encrypt as an argument:
   • For Linux/macOS:

     ./encscript.sh <path_to_file>

   • For Windows:

     .\encscript.ps1 <path_to_file>

2. The script will generate a self-contained extraction script that contains the compressed and encrypted data.

Step 2: Extract the File

1. Transfer the extraction script to the target system.
2. Run the extraction script to extract the original file:
   • For Linux/macOS:

     ./genscript.sh

   • For Windows:

     .\genscript.ps1

3. The script will extract and decompress the file, verifying its integrity in the process.

Example

Compressing a File

• For Linux/macOS:

./encscript.sh myfile.txt

• For Windows:

.\encscript.ps1 myfile.txt

This will generate a self-contained extraction script that contains the compressed and encrypted version of myfile.txt.

Extracting the File

• For Linux/macOS:

./genscript.sh

• For Windows:

.\genscript.ps1

This will extract myfile.txt from the extraction script, decompress it, and verify its integrity.

Notes

• Ensure that the target system has the necessary commands installed before running the extraction script.
• The extraction script is self-contained and can be distributed independently.

License

This project is licensed under the MIT License. See the LICENSE file for details.