keygentoolshed/keyGen/shamir/generateShares.js

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

import { program } from 'commander';
import crypto from 'crypto';

// Function to generate a random polynomial of degree t-1
function generatePolynomial(secret, threshold) {
    const coefficients = [secret];
    for (let i = 1; i < threshold; i++) {
        coefficients.push(crypto.randomInt(0, 256)); // Random coefficients
    }
    return coefficients;
}

// Function to evaluate the polynomial at a given x
function evaluatePolynomial(coefficients, x) {
    return coefficients.reduce((acc, coeff, index) => {
        return (acc + coeff * Math.pow(x, index)) % 256; // Modulo 256 for simplicity
    }, 0);
}

// Function to generate shares
function generateShares(secret, totalShares, threshold) {
    const coefficients = generatePolynomial(secret, threshold);
    const shares = [];

    for (let i = 1; i <= totalShares; i++) {
        const share = evaluatePolynomial(coefficients, i);
        shares.push({ share: share, index: i });
    }
    return shares;
}

// Main function to handle command-line arguments
function main() {
    program
        .option('--secret <number>', 'The secret to share (0-255)', parseInt)
        .option('--totalShares <number>', 'Total number of shares to generate', parseInt)
        .option('--threshold <number>', 'Threshold number of shares required to reconstruct the secret', parseInt);

    program.parse(process.argv);
    const options = program.opts();

    if (options.secret === undefined || options.totalShares === undefined || options.threshold === undefined) {
        console.error('Please provide secret, totalShares, and threshold options.');
        process.exit(1);
    }

    const shares = generateShares(options.secret, options.totalShares, options.threshold);
    console.log('Generated Shares:', shares);
}

main();