Jede Person wirft eigene Münze: sharedSeed + per-peer Result via SHA-256

app.js

@@ -122,20 +122,57 @@
   }
 
   /* ─── Coin animation ─── */
-  function flipCoin(resultBit, areaId) {
-    const area = $(areaId);
-    if (!area) return;
-    area.hidden = false;
-    const coin = area.querySelector('.coin');
-    coin.classList.remove('flipping','result-kopf','result-zahl');
-    void coin.offsetWidth;
-    coin.classList.add('flipping');
+  function flipCoinEl(coinEl, resultBit) {
+    coinEl.classList.remove('flipping','result-kopf','result-zahl');
+    void coinEl.offsetWidth;
+    coinEl.classList.add('flipping');
     setTimeout(() => {
-      coin.classList.remove('flipping');
-      coin.classList.add(resultBit === 0 ? 'result-kopf' : 'result-zahl');
+      coinEl.classList.remove('flipping');
+      coinEl.classList.add(resultBit === 0 ? 'result-kopf' : 'result-zahl');
     }, 1500);
   }
 
+  function renderResults(results) {
+    const container = $('results-container');
+    container.innerHTML = '';
+    container.hidden = false;
+
+    const all = [mesh.myPeerId, ...mesh.getPeerIds()];
+    const seen = new Set();
+
+    all.forEach(id => {
+      if (seen.has(id)) return;
+      seen.add(id);
+      const r = results.get(id);
+      if (r === undefined) return;
+
+      const isMe = id === mesh.myPeerId;
+      const name = isMe ? 'Du' : id.slice(0, 8);
+
+      const item = document.createElement('div');
+      item.className = 'result-item';
+      item.dataset.result = r;
+      item.innerHTML = `
+        <div class="coin mini">
+          <div class="coin-inner">
+            <div class="coin-face front">K</div>
+            <div class="coin-face back">Z</div>
+          </div>
+        </div>
+        <div class="result-label">${name}</div>
+      `;
+      container.appendChild(item);
+    });
+
+    requestAnimationFrame(() => {
+      const coins = container.querySelectorAll('.coin');
+      coins.forEach((coin, i) => {
+        const r = parseInt(coin.closest('.result-item').dataset.result);
+        setTimeout(() => flipCoinEl(coin, r), i * 400);
+      });
+    });
+  }
+
   /* ─── Protocol phases UI ─── */
   function updatePhases(state) {
     const map = { IDLE:'ready', STARTING:'ready', COMMITTING:'commit',
@@ -158,7 +195,7 @@
     show('game');
     renderPlayers('game-player-list');
     $('btn-start-protocol').hidden = autostart || role !== 'host';
-    $('coin-area').hidden = true;
+    $('results-container').hidden = true;
     $('result-area').hidden = true;
     $('protocol-text').textContent = autostart ? 'Starte Protokoll...' : 'Bereit zum Münzwurf';
     updatePhases('IDLE');
@@ -170,12 +207,11 @@
       $('protocol-text').textContent =
         phase === 'commit' ? `Commits: ${rcvd}/${total}` : `Reveals: ${rcvd}/${total}`;
     };
-    protocol.oncomplete = result => {
-      const text = result === 0 ? 'KOPF' : 'ZAHL';
-      $('protocol-text').textContent = `Ergebnis: ${text}!`;
-      flipCoin(result, 'coin-area');
+    protocol.oncomplete = results => {
+      $('protocol-text').textContent = 'Ergebnisse';
+      renderResults(results);
       $('result-area').hidden = false;
-      $('result-text').textContent = text;
+      $('result-text').textContent = 'Fertig';
       $('btn-start-protocol').hidden = true;
     };
     protocol.onerror = err => {
@@ -188,7 +224,7 @@
     mesh.ondata = (peerId, msg) => {
       if (msg.type === 'protocol_start') {
         if (protocol) protocol.reset();
-        $('coin-area').hidden = true;
+        $('results-container').hidden = true;
         $('result-area').hidden = true;
         $('btn-start-protocol').hidden = true;
         updatePhases('IDLE');
@@ -335,7 +371,7 @@
   /* ─── Retry / again ─── */
   $('btn-retry').addEventListener('click', () => {
     if (protocol) protocol.reset();
-    $('coin-area').hidden = true;
+    $('results-container').hidden = true;
     $('result-area').hidden = true;
     $('btn-start-protocol').hidden = role !== 'host';
     $('protocol-text').textContent = 'Bereit zum Münzwurf';
@@ -345,7 +381,7 @@
   /* ─── Result screen → play again ─── */
   $('btn-play-again').addEventListener('click', () => {
     if (protocol) protocol.reset();
-    $('coin-area').hidden = true;
+    $('results-container').hidden = true;
     $('result-area').hidden = true;
     setupGame(false);
   });

crypto.js

@@ -24,14 +24,23 @@ function arraysEqual(a, b) {
   return diff === 0;
 }
 
-function combine(secrets) {
+function combineAll(secrets) {
   const result = new Uint8Array(32);
   for (const secret of secrets) {
     for (let i = 0; i < 32; i++) {
       result[i] ^= secret[i];
     }
   }
-  return result[0] & 1;
+  return result;
+}
+
+async function computePeerResult(sharedSeed, peerId) {
+  const data = new TextEncoder().encode(peerId);
+  const combined = new Uint8Array(sharedSeed.length + data.length);
+  combined.set(sharedSeed);
+  combined.set(data, sharedSeed.length);
+  const hash = await crypto.subtle.digest('SHA-256', combined);
+  return new Uint8Array(hash)[0] & 1;
 }
 
 function bufToBase64(buf) {

index.html

@@ -93,14 +93,7 @@
         <div class="phase" id="phase-done">Ergebnis</div>
       </div>
       <div id="protocol-text" class="protocol-text">Warte auf Start...</div>
-      <div id="coin-area" hidden>
-        <div id="coin" class="coin">
-          <div class="coin-inner">
-            <div class="coin-face front">K</div>
-            <div class="coin-face back">Z</div>
-          </div>
-        </div>
-      </div>
+      <div id="results-container" class="results-container" hidden></div>
       <div id="result-area" hidden>
         <h3 id="result-text"></h3>
         <button id="btn-retry" class="btn-primary">Nochmal</button>

protocol.js

@@ -149,10 +149,16 @@ class CoinFlipProtocol {
       }
     }
 
+    const sharedSeed = combineAll(Array.from(this.reveals.values()));
+    const results = new Map();
+    for (const pid of this.expectedPeers) {
+      results.set(pid, await computePeerResult(sharedSeed, pid));
+    }
+
     this.state = 'COMPLETE';
-    this.result = combine(Array.from(this.reveals.values()));
+    this.results = results;
     if (this.onstatechange) this.onstatechange('COMPLETE');
-    if (this.oncomplete) this.oncomplete(this.result);
+    if (this.oncomplete) this.oncomplete(results);
   }
 
   /* ─── Reset ─── */

style.css

@@ -268,6 +268,31 @@ h3 {
   transform: rotateY(180deg);
 }
 
+/* Results container (per-peer coins) */
+.results-container {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 20px;
+  justify-content: center;
+  margin: 20px 0;
+}
+.result-item {
+  text-align: center;
+}
+.result-item .coin.mini {
+  width: 80px;
+  height: 80px;
+  margin: 0 auto 8px;
+  perspective: 400px;
+}
+.result-item .coin.mini .coin-face {
+  font-size: 1.6rem;
+}
+.result-label {
+  font-size: 0.85rem;
+  color: var(--text-dim);
+}
+
 /* Result area */
 #result-area {
   margin-top: 24px;