Encrypt-Decrypt

A Node.js project that demonstrates advanced encryption and decryption using streams. The project implements a simple encryption logic that increments each byte by 1 and a corresponding decryption that decrements each byte.

Project Structure

• app.ts - Main application file containing encryption/decryption logic
• to_know.txt - Input file for encryption
• encrypt.txt - Encrypted output file
• decrypt.txt - Decrypted output file
• package.json - Project configuration and dependencies
• tsconfig.json - TypeScript configuration

Features

• Stream-based processing for memory efficiency
• Progress tracking during encryption
• Asynchronous file handling
• TypeScript implementation

Implementation

The project uses two main classes:

Encrypt

• Extends the Node.js Transform stream.
• Encrypts data by incrementing each byte by 1.
• Tracks and displays encryption progress.

Decrypt

• Extends the Node.js Transform stream.
• Decrypts data by decrementing each byte by 1.

Installation

• Make sure you have Node.js (v22.6.0) installed.

npm install

Usage

• Go to the code and change the input file name in the to_know.txt variable.
• Uncomment the encode function call in the app.ts file to encrypt the file.
• Run the application.

npm start

Vice versa, to decrypt the file, uncomment the decode function call in the app.ts file and run the application.

Requirements

• Node.js version: v22.6.0 (specified in .nvmrc)
• TypeScript