write commitment_game gui screen logic

Author: Susmita-Chakrabarty

ZKP_Demo_Tool/commitment_game.py

@@ -0,0 +1,106 @@
+import sys
+import hashlib
+import secrets
+from PyQt5.QtWidgets import (
+    QApplication, QWidget, QVBoxLayout, QPushButton, QLabel, QLineEdit,
+    QMessageBox, QHBoxLayout, QTextEdit
+)
+from PyQt5.QtGui import QFont
+from PyQt5.QtCore import Qt
+
+class CommitmentGameWindow(QWidget):
+    def __init__(self):
+        super().__init__()
+
+        self.setWindowTitle("🔒 Commitment Game")
+        self.setFixedSize(500, 500)
+        self.setStyleSheet("background-color: #2C3E50;")
+
+        layout = QVBoxLayout()
+
+        title = QLabel("🔐 Commitment Scheme Simulation")
+        title.setFont(QFont("Arial", 16, QFont.Bold))
+        title.setStyleSheet("color: white; padding: 10px;")
+        title.setAlignment(Qt.AlignCenter)
+        layout.addWidget(title)
+
+        role_label = QLabel("🧑‍💻 You are the Prover. The system plays the Verifier.")
+        role_label.setStyleSheet("color: #ECF0F1; padding: 5px;")
+        role_label.setAlignment(Qt.AlignCenter)
+        layout.addWidget(role_label)
+
+        self.secret_input = QLineEdit()
+        self.secret_input.setPlaceholderText("Enter your secret value")
+        self.secret_input.setFont(QFont("Arial", 12))
+        self.secret_input.setStyleSheet("padding: 8px;")
+        layout.addWidget(self.secret_input)
+
+        commit_btn = QPushButton("🔒 Commit to Secret")
+        commit_btn.setFont(QFont("Arial", 12))
+        commit_btn.setStyleSheet("margin: 10px; padding: 10px;")
+        commit_btn.clicked.connect(self.generate_commitment)
+        layout.addWidget(commit_btn)
+
+        reveal_btn = QPushButton("🔓 Reveal to Verifier")
+        reveal_btn.setFont(QFont("Arial", 12))
+        reveal_btn.setStyleSheet("margin: 10px; padding: 10px;")
+        reveal_btn.clicked.connect(self.reveal_secret)
+        layout.addWidget(reveal_btn)
+
+        self.commitment_label = QLabel("Commitment: ...")
+        self.commitment_label.setStyleSheet("color: #ECF0F1; margin: 10px;")
+        layout.addWidget(self.commitment_label)
+
+        self.transcript_box = QTextEdit()
+        self.transcript_box.setReadOnly(True)
+        self.transcript_box.setStyleSheet("background-color: #34495E; color: #F1C40F; padding: 10px;")
+        layout.addWidget(self.transcript_box)
+
+        self.result_label = QLabel("")
+        self.result_label.setStyleSheet("color: #1ABC9C; font-weight: bold; padding: 10px;")
+        layout.addWidget(self.result_label)
+
+        self.setLayout(layout)
+
+        self.nonce = None
+        self.commitment = None
+
+    def generate_commitment(self):
+        secret = self.secret_input.text().strip()
+        if not secret:
+            QMessageBox.warning(self, "Input Error", "Please enter a secret value.")
+            return
+
+        self.nonce = secrets.token_hex(8)
+        combined = secret + self.nonce
+        self.commitment = hashlib.sha256(combined.encode()).hexdigest()
+
+        self.commitment_label.setText(f"Commitment: {self.commitment}")
+        self.transcript_box.clear()
+        self.transcript_box.append("Prover commits to a secret using SHA-256(secret || nonce)")
+        self.transcript_box.append(f"nonce: {self.nonce}")
+        self.transcript_box.append("Commitment sent to Verifier")
+        self.result_label.setText("✅ Secret committed. You may now reveal.")
+        self.result_label.setStyleSheet("color: #1ABC9C; font-weight: bold; padding: 10px;")
+
+    def reveal_secret(self):
+        if not self.commitment:
+            QMessageBox.warning(self, "No Commitment", "Please commit to a value first.")
+            return
+
+        secret = self.secret_input.text().strip()
+        combined = secret + self.nonce
+        check = hashlib.sha256(combined.encode()).hexdigest()
+
+        self.transcript_box.append("\nProver reveals the secret and nonce...")
+        self.transcript_box.append(f"secret: {secret}")
+        self.transcript_box.append(f"recomputed hash: {check}")
+
+        if check == self.commitment:
+            self.result_label.setStyleSheet("color: #1ABC9C; font-weight: bold; padding: 10px;")
+            self.result_label.setText("✅ Reveal successful. Verifier is convinced.")
+            self.transcript_box.append("Verifier confirms: ✅ commitment is valid!")
+        else:
+            self.result_label.setStyleSheet("color: red; font-weight: bold; padding: 10px;")
+            self.result_label.setText("❌ Reveal failed. Commitment mismatch.")
+            self.transcript_box.append("Verifier says: ❌ mismatch in commitment!")

ZKP_Demo_Tool/zkp_gui_launcher.py

@@ -4,7 +4,7 @@
 )
 from PyQt5.QtGui import QFont, QPalette, QColor
 from PyQt5.QtCore import Qt
-
+from commitment_game import CommitmentGameWindow
 class ZKPGUILauncher(QWidget):
     def __init__(self):
         super().__init__()
@@ -52,8 +52,8 @@ def __init__(self):
         self.setLayout(layout)
 
     def commitment_game(self):
-        QMessageBox.information(self, "Coming Soon", "\ud83d\udd10 Commitment Game will launch here!")
-
+        self.commit_window = CommitmentGameWindow()
+        self.commit_window.show()
     def zkp_game(self):
         QMessageBox.information(self, "Coming Soon", "\ud83d\udc65 Prover-Verifier ZKP Game will launch here!")