keygentoolshed/keyGen/encryptandecrypt/decryptChunk.js

Key generation utilities for cryptographic operations. QUANTUM ENCRYPTION FOLDER UPDATE!!! See its folder for all <3

import crypto from 'crypto';
import fs from 'fs';
import yargs from 'yargs/yargs';
import { hideBin } from 'yargs/helpers';

const argv = yargs(hideBin(process.argv))
    .option('inputfile', {
        alias: 'inf',
        description: 'Path to the file containing the encrypted chunk',
        type: 'string',
        demandOption: true
    })
    .option('method', {
        alias: 'm',
        description: 'Decryption method to use',
        type: 'string',
        choices: [
            'aes-128-cbc', 'aes-192-cbc', 'aes-256-cbc',
            'aes-128-xts', 'aes-192-xts', 'aes-256-xts',
            'aes-128-gcm', 'aes-192-gcm', 'aes-256-gcm',
            'des-ede3-cbc', 'rc4', 'chacha20',
            'twofish', 'serpent', 'blowfish',
            'cast5', 'idea', 'rc2', 'seed',
            'camellia-128-cbc', 'camellia-192-cbc', 'camellia-256-cbc'
        ],
        demandOption: true
    })
    .option('key', {
        alias: 'k',
        description: 'Encryption key in raw format',
        type: 'string',
        demandOption: true
    })
    .option('iv', {
        alias: 'i',
        description: 'Initialization vector in raw format',
        type: 'string',
        demandOption: true
    })
    .option('outputfile', {
        alias: 'ouf',
        description: 'Path to save the decrypted chunk',
        type: 'string',
        demandOption: true
    })
    .help()
    .argv;

function decryptChunk(inputPath, method, key, iv, outputPath) {
    const encryptedChunk = fs.readFileSync(inputPath);
    
    const keyBuffer = Buffer.from(key, 'binary'); 
    const ivBuffer = Buffer.from(iv, 'binary'); 

    const decipher = crypto.createDecipheriv(method, keyBuffer, ivBuffer);

    let decrypted = decipher.update(encryptedChunk);
    decrypted = Buffer.concat([decrypted, decipher.final()]);

    fs.writeFileSync(outputPath, decrypted);
    
    console.log(`Decrypted chunk saved to: ${outputPath}`);
}

decryptChunk(argv.inputfile, argv.method, argv.key, argv.iv, argv.outputfile);