Fairness

// Verify Mines Game
import seedrandom from 'seedrandom';

async function sha256(string) {
  const encoder = new TextEncoder();
  const data = encoder.encode(string);
  const hashBuffer = await crypto.subtle.digest('SHA-256', data);
  const hashArray = Array.from(new Uint8Array(hashBuffer));
  return hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
}

function verifyMines(seedr, mineCount) {
  const positions = Array.from({ length: 25 }, (_, i) => i + 1);
  const minePositions = [];

  while (minePositions.length < mineCount) {
    const j = positions.splice(Math.floor(seedr() * positions.length), 1)[0];
    minePositions.push(j);
  }

  return minePositions;
}

// Example usage:
const clientSeed = "your-client-seed";
const serverSeed = "revealed-server-seed";
const nonce = 1234;
const mineCount = 5;

const hash = await sha256(`${clientSeed}:${serverSeed}:${nonce}`);
const random = seedrandom(hash);
const minePositions = verifyMines(random, mineCount);
console.log('Mine Positions:', minePositions);