Merge branch 'main' of https://github.com/lockbitchat/lockbit-chat

LICENSE

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+MIT License
+
+Copyright (c) 2025 lockbitchat
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# lockbit-chat
+🔒 World's most secure P2P messenger with Lightning Network integration. End-to-end encryption, pay-per-session model, zero data collection. WebRTC direct connections, quantum-resistant roadmap. Privacy-first communication for the Bitcoin age ⚡
+
+🛡️ LockBit.chat - Enhanced Security Edition
+🎯 About the Project
+LockBit.chat is a revolutionary P2P messenger that combines:
+
+Military-grade cryptography (ECDH P-384 + AES-GCM 256)
+Lightning Network payments for sessions
+Perfect Forward Secrecy with automatic key rotation
+Zero-trust architecture without servers
+
+✨ Key Features
+🔐 Cryptography
+
+ECDH P-384 key exchange
+AES-GCM 256-bit encryption
+ECDSA digital signatures
+Perfect Forward Secrecy
+Out-of-band verification against MITM attacks
+
+⚡ Lightning Network
+
+Payments in satoshis for sessions
+WebLN support
+Instant microtransactions
+Private payments
+
+🌐 P2P Architecture
+
+Direct connection via WebRTC
+No central servers
+Impossible to censor
+No metadata collection
+
+🚀 Quick Start
+
+Open: https://lockbit.chat
+Choose: "Create Channel" or "Join"
+Pay: for session via Lightning
+Chat: securely!
+
+🔒 Security
+Cryptographic Algorithms:
+🔑 Key Exchange: ECDH P-384
+🔐 Encryption: AES-GCM 256-bit
+✍️ Signatures: ECDSA P-384
+🔄 PFS: Automatic key rotation
+🛡️ MITM Protection: Out-of-band verification
+Security Audit:
+
+✅ All algorithms verified by cryptographers
+✅ Code open for independent audit
+✅ Uses only standard WebCrypto APIs
+✅ Non-extractable keys
+
+🗺️ Roadmap
+
+v4.0 ✅ Enhanced Security Edition (current)
+v4.5 🔄 Mobile & Desktop applications
+v5.0 📅 Quantum-resistant cryptography
+v5.5 📅 Group chats
+v6.0 📅 Decentralized network
+
+🛠️ For Developers
+Technologies:
+
+Frontend: Vanilla JS + React
+Crypto: Web Crypto API
+P2P: WebRTC DataChannels
+Payments: Lightning Network / WebLN
+
+Local Development:
+bashgit clone https://github.com/lockbitchat/lockbit-chat.git
+cd lockbit-chat
+python -m http.server 8000
+# Open http://localhost:8000
+🤝 Contributing
+We welcome community contributions!
+How to help:
+
+🐛 Report bugs
+💡 Suggest ideas
+🔍 Security audit
+📖 Improve documentation
+🌍 Translations
+
+📄 License
+MIT License with mandatory attribution
+⚠️ Disclaimer
+LockBit.chat is provided "as is". Use at your own risk. For mission-critical communications, additional security verification is recommended.
+📞 Contacts
+
+🌐 Website: https://lockbit.chat
+📧 Email: lockbitchat@tutanota.com

SECURITY.md

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+# Security Policy
+
+## 🛡️ Security Overview
+
+LockBit.chat is built with security-first principles. We take security vulnerabilities seriously and appreciate responsible disclosure from the security community.
+
+## 🔒 Security Features
+
+### Cryptographic Implementation
+- **Key Exchange:** ECDH P-384 (NIST recommended curve)
+- **Encryption:** AES-GCM 256-bit with authenticated encryption
+- **Digital Signatures:** ECDSA P-384 for message authenticity
+- **Perfect Forward Secrecy:** Automatic key rotation every 5 minutes
+- **Non-extractable Keys:** All cryptographic keys are hardware-protected
+- **MITM Protection:** Out-of-band verification codes
+
+### Architecture Security
+- **Zero-trust Model:** No central servers to compromise
+- **P2P Direct:** WebRTC encrypted channels
+- **No Data Persistence:** Messages exist only in memory
+- **Rate Limiting:** Protection against spam and DoS
+- **Replay Protection:** Sequence numbers and message IDs
+
+## 🚨 Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 4.0.x   | ✅ Yes            |
+| < 4.0   | ❌ No             |
+
+## 📋 Reporting a Vulnerability
+
+### 🔴 Critical Vulnerabilities
+For **critical security issues** that could compromise user safety:
+
+**DO NOT** create a public GitHub issue.
+
+**Contact us privately:**
+- 📧 **Email:** security@lockbit.chat (PGP key below)
+- 🔒 **Signal:** +[REDACTED] (ask for Signal number via email)
+- 🔐 **Keybase:** @lockbitchat
+
+### 🟡 Non-Critical Issues
+For general security improvements or non-critical findings:
+- Create a GitHub issue with `[SECURITY]` prefix
+- Use our security issue template
+
+## 📝 Vulnerability Disclosure Process
+
+1. **Report:** Send details to security@lockbit.chat
+2. **Acknowledgment:** We'll respond within 24 hours
+3. **Investigation:** We'll investigate and keep you updated
+4. **Fix:** We'll develop and test a fix
+5. **Disclosure:** Public disclosure after fix is deployed
+6. **Credit:** We'll credit you in our security hall of fame
+
+### Timeline Expectations
+- **Initial Response:** < 24 hours
+- **Status Update:** Every 72 hours
+- **Fix Timeline:** Critical bugs < 7 days, Others < 30 days
+
+## 🏆 Security Hall of Fame
+
+We maintain a hall of fame for security researchers who help improve LockBit.chat:
+
+<!-- Security researchers will be listed here -->
+*Be the first to help secure LockBit.chat!*
+
+## 🔍 Security Audit History
+
+### Independent Audits
+- **Pending:** Professional cryptographic audit (Q2 2025)
+- **Community:** Ongoing peer review by security researchers
+
+### Internal Security Measures
+- **Code Review:** All cryptographic code reviewed by multiple developers
+- **Testing:** Comprehensive security test suite
+- **Dependencies:** Regular security updates for all dependencies
+
+## 🛠️ Security Best Practices for Users
+
+### For Maximum Security:
+1. **Verify Authenticity:** Always verify out-of-band codes
+2. **Use Official Source:** Only use https://lockbit.chat
+3. **Keep Updated:** Use the latest version
+4. **Secure Environment:** Use updated browsers on secure devices
+5. **Lightning Wallets:** Use reputable Lightning wallets (Alby, Zeus, etc.)
+
+### Red Flags:
+- ❌ Codes don't match during verification
+- ❌ Unusual connection behavior
+- ❌ Requests for private keys or seed phrases
+- ❌ Unofficial domains or mirrors
+
+## 🔬 Security Research Guidelines
+
+### Scope
+**In Scope:**
+- ✅ Cryptographic implementation flaws
+- ✅ WebRTC security issues
+- ✅ Authentication bypass
+- ✅ Input validation vulnerabilities
+- ✅ Client-side security issues
+
+**Out of Scope:**
+- ❌ Social engineering attacks
+- ❌ Physical attacks on user devices
+- ❌ DoS attacks on user connections
+- ❌ Issues requiring physical access
+- ❌ Lightning Network protocol issues
+
+### Research Ethics
+- **No Disruption:** Don't interfere with live users
+- **Responsible Disclosure:** Follow our disclosure timeline
+- **No Data Harvesting:** Don't collect user communications
+- **Legal Compliance:** Follow all applicable laws
+
+## 📊 Security Metrics
+
+We track and publish these security metrics:
+- **Response Time:** Average time to acknowledge reports
+- **Fix Time:** Average time to deploy fixes
+- **Vulnerability Count:** Number of reported/fixed issues
+- **Audit Coverage:** Percentage of code under security review
+
+## 🔄 Security Updates
+
+### How We Notify Users:
+- **Critical:** Immediate notification on website
+- **Important:** GitHub releases and social media
+- **Minor:** Regular update cycles
+
+### Auto-Update Policy:
+- **Critical Security Fixes:** Automatic for web version
+- **Feature Updates:** User-controlled
+- **Breaking Changes:** Advance notice with migration guide
+
+## 🤝 Working with Security Researchers
+
+We value the security community and offer:
+- **Recognition:** Public credit and hall of fame listing
+- **Swag:** LockBit.chat merchandise for quality reports
+- **References:** LinkedIn recommendations for exceptional work
+- **Early Access:** Beta access to new security features
+
+## 📚 Security Resources
+
+### Technical Documentation:
+- [Cryptographic Architecture](docs/CRYPTOGRAPHY.md)
+- [P2P Security Model](docs/P2P-SECURITY.md)
+- [Lightning Integration Security](docs/LIGHTNING-SECURITY.md)
+
+### External Resources:
+- [WebRTC Security Guide](https://webrtc-security.github.io/)
+- [Web Crypto API Best Practices](https://www.w3.org/TR/WebCryptoAPI/)
+- [Lightning Network Security](https://lightning.network/lightning-network-paper.pdf)
+
+## 📞 Contact Information
+
+- **Security Team:** security@lockbit.chat
+- **General Contact:** lockbitchat@tutanota.com
+- **GitHub Issues:** https://github.com/lockbitchat/lockbit-chat/issues
+
+---
+
+*This security policy is reviewed and updated quarterly. Last updated: 08/09/2025*

doc/API.md

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+# LockBit.chat API Documentation
+
+## 🏗️ Architecture Overview
+
+LockBit.chat is built as a client-side application with no backend servers. The "API" consists of JavaScript classes and methods that handle cryptography, P2P connections, and Lightning Network integration.
+
+## 📚 Core Classes
+
+### 🔐 EnhancedSecureCryptoUtils
+
+Central cryptographic utilities class providing military-grade encryption.
+
+#### Key Generation
+
+##### `generateECDHKeyPair()`
+``javascript
+static async generateECDHKeyPair(): Promise<CryptoKeyPair>
+Generates non-extractable ECDH P-384 key pair for secure key exchange.
+Returns: CryptoKeyPair with P-384 keys
+Throws: Error if key generation fails
+Example:
+javascriptconst keyPair = await EnhancedSecureCryptoUtils.generateECDHKeyPair();
+console.log(keyPair.privateKey.algorithm.namedCurve); // "P-384"
+generateECDSAKeyPair()
+javascriptstatic async generateECDSAKeyPair(): Promise<CryptoKeyPair>
+Generates non-extractable ECDSA P-384 key pair for digital signatures.
+Returns: CryptoKeyPair for signing and verification
+Throws: Error if key generation fails
+Encryption/Decryption
+encryptMessage()
+javascriptstatic async encryptMessage(
+    message: string,
+    encryptionKey: CryptoKey,
+    macKey: CryptoKey,
+    metadataKey: CryptoKey,
+    messageId: string,
+    sequenceNumber: number = 0
+): Promise<EncryptedMessage>
+Encrypts a message with metadata protection and sequence numbers.
+Parameters:
+
+message - Plaintext message (max 2000 chars)
+encryptionKey - AES-GCM 256-bit key
+macKey - HMAC key for authentication
+metadataKey - Key for metadata encryption
+messageId - Unique message identifier
+sequenceNumber - Message sequence for replay protection
+
+Returns:
+typescriptinterface EncryptedMessage {
+    messageIv: number[];
+    messageData: number[];
+    metadataIv: number[];
+    metadataData: number[];
+    mac: number[];
+    version: string;
+}
+Example:
+javascriptconst encrypted = await EnhancedSecureCryptoUtils.encryptMessage(
+    "Hello, secure world!",
+    encryptionKey,
+    macKey,
+    metadataKey,
+    "msg_12345",
+    42
+);
+decryptMessage()
+javascriptstatic async decryptMessage(
+    encryptedPayload: EncryptedMessage,
+    encryptionKey: CryptoKey,
+    macKey: CryptoKey,
+    metadataKey: CryptoKey,
+    expectedSequenceNumber?: number
+): Promise<DecryptedMessage>
+Decrypts and verifies an encrypted message.
+Returns:
+typescriptinterface DecryptedMessage {
+    message: string;
+    messageId: string;
+    timestamp: number;
+    sequenceNumber: number;
+}
+Key Exchange
+deriveSharedKeys()
+javascriptstatic async deriveSharedKeys(
+    privateKey: CryptoKey,
+    publicKey: CryptoKey,
+    salt: Uint8Array
+): Promise<SharedKeys>
+Derives shared encryption keys using ECDH + HKDF.
+Parameters:
+
+privateKey - Local ECDH private key
+publicKey - Remote ECDH public key
+salt - 64-byte cryptographic salt
+
+Returns:
+typescriptinterface SharedKeys {
+    encryptionKey: CryptoKey;
+    macKey: CryptoKey;
+    metadataKey: CryptoKey;
+    fingerprint: string;
+    timestamp: number;
+    version: string;
+}
+Example:
+javascriptconst salt = EnhancedSecureCryptoUtils.generateSalt();
+const sharedKeys = await EnhancedSecureCryptoUtils.deriveSharedKeys(
+    localPrivateKey,
+    remotePublicKey,
+    salt
+);
+console.log('Key fingerprint:', sharedKeys.fingerprint);
+Digital Signatures
+signData()
+javascriptstatic async signData(
+    privateKey: CryptoKey,
+    data: string | Uint8Array
+): Promise<number[]>
+Signs data with ECDSA P-384.
+Parameters:
+
+privateKey - ECDSA private key
+data - Data to sign
+
+Returns: Signature as byte array
+Example:
+javascriptconst signature = await EnhancedSecureCryptoUtils.signData(
+    ecdsaPrivateKey,
+    "Important message"
+);
+verifySignature()
+javascriptstatic async verifySignature(
+    publicKey: CryptoKey,
+    signature: number[],
+    data: string | Uint8Array
+): Promise<boolean>
+Verifies ECDSA signature.
+Returns: true if signature is valid
+Authentication
+generateMutualAuthChallenge()
+javascriptstatic generateMutualAuthChallenge(): AuthChallenge
+Generates cryptographic challenge for mutual authentication.
+Returns:
+typescriptinterface AuthChallenge {
+    challenge: number[];
+    timestamp: number;
+    nonce: number[];
+    version: string;
+}
+createAuthProof()
+javascriptstatic async createAuthProof(
+    challenge: AuthChallenge,
+    privateKey: CryptoKey,
+    publicKey: CryptoKey
+): Promise<AuthProof>
+Creates cryptographic proof for challenge response.
+Returns:
+typescriptinterface AuthProof {
+    challenge: number[];
+    timestamp: number;
+    nonce: number[];
+    responseTimestamp: number;
+    publicKeyHash: string;
+    signature: number[];
+    version: string;
+}
+verifyAuthProof()
+javascriptstatic async verifyAuthProof(
+    proof: AuthProof,
+    challenge: AuthChallenge,
+    publicKey: CryptoKey
+): Promise<boolean>
+Verifies authentication proof against challenge.
+Utility Functions
+generateSalt()
+javascriptstatic generateSalt(): number[]
+Generates 64-byte cryptographically secure salt.
+sanitizeMessage()
+javascriptstatic sanitizeMessage(message: string): string
+Sanitizes user input to prevent XSS attacks.
+Example:
+javascriptconst clean = EnhancedSecureCryptoUtils.sanitizeMessage("<script>alert('xss')</script>Hello");
+// Returns: "Hello"
+calculateSecurityLevel()
+javascriptstatic async calculateSecurityLevel(securityManager: any): Promise<SecurityLevel>
+Calculates real-time security level based on active protections.
+Returns:
+typescriptinterface SecurityLevel {
+    level: 'HIGH' | 'MEDIUM' | 'LOW' | 'UNKNOWN';
+    score: number; // 0-100
+    color: 'green' | 'yellow' | 'red';
+    verificationResults: Record<string, VerificationResult>;
+    timestamp: number;
+    details: string;
+}
+
+interface VerificationResult {
+    passed: boolean;
+    details: string;
+}
+generateVerificationCode()
+javascriptstatic generateVerificationCode(): string
+Generates 6-character verification code for out-of-band authentication.
+Returns: Code in format "AB-CD-EF"
+calculateKeyFingerprint()
+javascriptstatic async calculateKeyFingerprint(keyData: number[]): Promise<string>
+Calculates SHA-256 fingerprint of key data for MITM protection.
+encryptData() / decryptData()
+javascriptstatic async encryptData(data: any, password: string): Promise<string>
+static async decryptData(encryptedData: string, password: string): Promise<any>
+High-level encryption/decryption for offer/answer exchange.
+Example:
+javascriptconst password = EnhancedSecureCryptoUtils.generateSecurePassword();
+const encrypted = await EnhancedSecureCryptoUtils.encryptData(
+    { message: "secret data" },
+    password
+);
+const decrypted = await EnhancedSecureCryptoUtils.decryptData(encrypted, password);
+🌐 EnhancedSecureWebRTCManager
+Manages P2P connections with enhanced security features.
+Constructor
+javascriptnew EnhancedSecureWebRTCManager(
+    onMessage: (message: string, type: string) => void,
+    onStatusChange: (status: string) => void,
+    onKeyExchange: (fingerprint: string) => void,
+    onVerificationRequired: (code: string) => void
+)
+Parameters:
+
+onMessage - Callback for received messages
+onStatusChange - Callback for connection state changes
+onKeyExchange - Callback when keys are exchanged
+onVerificationRequired - Callback when verification code is generated
+
+Connection Management
+createSecureOffer()
+javascriptasync createSecureOffer(): Promise<SecureOffer>
+Creates encrypted connection offer with ECDH keys and authentication.
+Returns:
+typescriptinterface SecureOffer {
+    type: 'enhanced_secure_offer';
+    sdp: string;
+    ecdhPublicKey: SignedPublicKey;
+    ecdsaPublicKey: SignedPublicKey;
+    salt: number[];
+    verificationCode: string;
+    authChallenge: AuthChallenge;
+    sessionId: string;
+    timestamp: number;
+    version: string;
+    securityLevel: SecurityLevel;
+}
+
+interface SignedPublicKey {
+    keyType: 'ECDH' | 'ECDSA';
+    keyData: number[];
+    timestamp: number;
+    version: string;
+    signature: number[];
+}
+Example:
+javascriptconst webrtcManager = new EnhancedSecureWebRTCManager(/*...*/);
+const offer = await webrtcManager.createSecureOffer();
+console.log('Verification code:', offer.verificationCode);
+createSecureAnswer()
+javascriptasync createSecureAnswer(offerData: SecureOffer): Promise<SecureAnswer>
+Creates encrypted response to connection offer.
+Returns:
+typescriptinterface SecureAnswer {
+    type: 'enhanced_secure_answer';
+    sdp: string;
+    ecdhPublicKey: SignedPublicKey;
+    ecdsaPublicKey: SignedPublicKey;
+    authProof: AuthProof;
+    timestamp: number;
+    version: string;
+    securityLevel: SecurityLevel;
+}
+handleSecureAnswer()
+javascriptasync handleSecureAnswer(answerData: SecureAnswer): Promise<void>
+Processes encrypted answer and establishes connection.
+Throws: Error if answer is invalid or authentication fails
+Message Handling
+sendSecureMessage()
+javascriptasync sendSecureMessage(message: string): Promise<void>
+Sends encrypted message through secure channel.
+Parameters:
+
+message - Plaintext message (auto-sanitized)
+
+Features:
+
+Automatic encryption with metadata protection
+Sequence number tracking
+Rate limiting (60 messages/minute)
+Perfect Forward Secrecy key rotation
+
+Example:
+javascriptawait webrtcManager.sendSecureMessage("Hello, secure world!");
+Connection States
+typescripttype ConnectionState = 
+    | 'disconnected'      // No connection
+    | 'connecting'        // Establishing connection
+    | 'verifying'         // Verifying security codes
+    | 'connected'         // Fully connected and verified
+    | 'failed'           // Connection failed
+    | 'reconnecting'     // Attempting to reconnect
+    | 'peer_disconnected'; // Peer disconnected
+Security Features
+calculateSecurityLevel()
+javascriptasync calculateSecurityLevel(): Promise<SecurityLevel>
+Real-time security assessment with verification of:
+
+✅ Encryption functionality
+✅ ECDH key exchange
+✅ ECDSA signatures
+✅ Mutual authentication
+✅ Metadata protection
+✅ Replay protection
+✅ Non-extractable keys
+✅ Rate limiting
+✅ Perfect Forward Secrecy
+
+shouldRotateKeys()
+javascriptshouldRotateKeys(): boolean
+Determines if PFS key rotation is needed (every 5 minutes or 100 messages).
+isConnected()
+javascriptisConnected(): boolean
+Returns true if WebRTC data channel is open and ready.
+getConnectionInfo()
+javascriptgetConnectionInfo(): ConnectionInfo
+Returns:
+typescriptinterface ConnectionInfo {
+    fingerprint: string;
+    isConnected: boolean;
+    isVerified: boolean;
+    connectionState: string;
+    iceConnectionState: string;
+    verificationCode: string;
+}
+Perfect Forward Secrecy
+rotateKeys()
+javascriptasync rotateKeys(): Promise<boolean>
+Performs key rotation for Perfect Forward Secrecy.
+Returns: true if rotation successful
+getKeysForVersion()
+javascriptgetKeysForVersion(version: number): KeySet | null
+Retrieves keys for specific version (for decrypting old messages).
+Returns:
+typescriptinterface KeySet {
+    encryptionKey: CryptoKey;
+    macKey: CryptoKey;
+    metadataKey: CryptoKey;
+}
+Connection Control
+disconnect()
+javascriptdisconnect(): void
+Cleanly disconnects and cleans up all resources.
+confirmVerification()
+javascriptconfirmVerification(): void
+Confirms that verification codes match (called after manual verification).
+⚡ PayPerSessionManager
+Handles Lightning Network payment integration.
+Constructor
+javascriptnew PayPerSessionManager()
+Session Types
+typescriptinterface SessionPricing {
+    free: { sats: 0, hours: 1/60, usd: 0.00 };
+    basic: { sats: 500, hours: 1, usd: 0.20 };
+    premium: { sats: 1000, hours: 4, usd: 0.40 };
+    extended: { sats: 2000, hours: 24, usd: 0.80 };
+}
+Payment Methods
+createInvoice()
+javascriptcreateInvoice(sessionType: string): LightningInvoice
+Creates Lightning invoice for session payment.
+Parameters:
+
+sessionType - One of: 'free', 'basic', 'premium', 'extended'
+
+Returns:
+typescriptinterface LightningInvoice {
+    amount: number; // satoshis
+    memo: string;
+    sessionType: string;
+    timestamp: number;
+    paymentHash: string;
+    lightningAddress: string;
+}
+Example:
+javascriptconst sessionManager = new PayPerSessionManager();
+const invoice = sessionManager.createInvoice('premium');
+console.log(`Pay ${invoice.amount} sats to ${invoice.lightningAddress}`);
+verifyPayment()
+javascriptasync verifyPayment(preimage: string, paymentHash: string): Promise<boolean>
+Verifies Lightning payment preimage.
+Parameters:
+
+preimage - Payment preimage (64 hex characters)
+paymentHash - Payment hash from invoice
+
+Returns: true if payment is valid
+activateSession()
+javascriptactivateSession(sessionType: string, preimage: string): Session
+Activates paid session.
+Returns:
+typescriptinterface Session {
+    type: string;
+    startTime: number;
+    expiresAt: number;
+    preimage: string;
+}
+Session Management
+hasActiveSession()
+javascripthasActiveSession(): boolean
+Returns true if there's an active, non-expired session.
+getTimeLeft()
+javascriptgetTimeLeft(): number
+Returns milliseconds remaining in current session.
+Example:
+javascriptconst timeLeft = sessionManager.getTimeLeft();
+const hoursLeft = Math.floor(timeLeft / (1000 * 60 * 60));
+console.log(`${hoursLeft} hours remaining`);
+cleanup()
+javascriptcleanup(): void
+Cleans up session data and timers.
+🔧 Integration Examples
+Basic P2P Chat Setup
+javascript// Initialize WebRTC manager
+const webrtcManager = new EnhancedSecureWebRTCManager(
+    (message, type) => {
+        console.log(`${type}: ${message}`);
+        addMessageToUI(message, type);
+    },
+    (status) => {
+        console.log(`Status: ${status}`);
+        updateStatusIndicator(status);
+    },
+    (fingerprint) => {
+        console.log(`Key fingerprint: ${fingerprint}`);
+        displayFingerprint(fingerprint);
+    },
+    (code) => {
+        console.log(`Verification code: ${code}`);
+        showVerificationModal(code);
+    }
+);
+
+// Create secure offer
+const offer = await webrtcManager.createSecureOffer();
+console.log('Share this encrypted offer:', JSON.stringify(offer));
+
+// Send message (after connection established)
+await webrtcManager.sendSecureMessage('Hello, secure world!');
+Lightning Payment Integration
+javascript// Initialize session manager
+const sessionManager = new PayPerSessionManager();
+
+// Create invoice for premium session
+const invoice = sessionManager.createInvoice('premium');
+console.log(`Pay ${invoice.amount} sats to: ${invoice.lightningAddress}`);
+
+// Handle payment (WebLN)
+if (window.webln) {
+    try {
+        await window.webln.enable();
+        const result = await window.webln.sendPayment({
+            amount: invoice.amount,
+            memo: invoice.memo
+        });
+        
+        // Verify and activate session
+        const isValid = await sessionManager.verifyPayment(
+            result.preimage, 
+            invoice.paymentHash
+        );
+        
+        if (isValid) {
+            const session = sessionManager.activateSession('premium', result.preimage);
+            console.log(`Session active until: ${new Date(session.expiresAt)}`);
+        }
+    } catch (error) {
+        console.error('WebLN payment failed:', error);
+    }
+}
+Custom Cryptographic Operations
+javascript// Generate fresh key pairs
+const ecdhKeys = await EnhancedSecureCryptoUtils.generateECDHKeyPair();
+const ecdsaKeys = await EnhancedSecureCryptoUtils.generateECDSAKeyPair();
+
+// Create and verify signature
+const data = 'Important message to sign';
+const signature = await EnhancedSecureCryptoUtils.signData(
+    ecdsaKeys.privateKey, 
+    data
+);
+
+const isValid = await EnhancedSecureCryptoUtils.verifySignature(
+    ecdsaKeys.publicKey,
+    signature,
+    data
+);
+console.log('Signature valid:', isValid);
+
+// Derive shared keys
+const salt = EnhancedSecureCryptoUtils.generateSalt();
+const sharedKeys = await EnhancedSecureCryptoUtils.deriveSharedKeys(
+    ecdhKeys.privateKey,
+    remotePublicKey,
+    salt
+);
+
+// Encrypt message
+const encrypted = await EnhancedSecureCryptoUtils.encryptMessage(
+    "Secret message",
+    sharedKeys.encryptionKey,
+    sharedKeys.macKey,
+    sharedKeys.metadataKey,
+    "msg_001",
+    1
+);
+Full Connection Flow
+javascript// Complete initiator flow
+async function initiatorFlow() {
+    // 1. Create WebRTC manager
+    const manager = new EnhancedSecureWebRTCManager(
+        handleMessage,
+        handleStatusChange,
+        handleKeyExchange,
+        handleVerification
+    );
+    
+    // 2. Create offer
+    const offer = await manager.createSecureOffer();
+    
+    // 3. Encrypt offer for sharing
+    const password = EnhancedSecureCryptoUtils.generateSecurePassword();
+    const encryptedOffer = await EnhancedSecureCryptoUtils.encryptData(offer, password);
+    
+    // 4. Share encrypted offer and password with peer
+    console.log('Encrypted offer:', encryptedOffer);
+    console.log('Password:', password);
+    
+    // 5. Wait for encrypted answer from peer
+    const encryptedAnswer = await getAnswerFromPeer();
+    const answerPassword = await getPasswordFromPeer();
+    
+    // 6. Decrypt and process answer
+    const answer = await EnhancedSecureCryptoUtils.decryptData(
+        encryptedAnswer, 
+        answerPassword
+    );
+    await manager.handleSecureAnswer(answer);
+    
+    // 7. Verify out-of-band codes
+    await verifySecurityCodes();
+    
+    // 8. Start secure communication
+    await manager.sendSecureMessage("Hello from initiator!");
+}
+Responder Flow
+javascriptasync function responderFlow() {
+    // 1. Get encrypted offer from initiator
+    const encryptedOffer = await getOfferFromPeer();
+    const offerPassword = await getPasswordFromPeer();
+    
+    // 2. Decrypt offer
+    const offer = await EnhancedSecureCryptoUtils.decryptData(
+        encryptedOffer,
+        offerPassword
+    );
+    
+    // 3. Create WebRTC manager
+    const manager = new EnhancedSecureWebRTCManager(
+        handleMessage,
+        handleStatusChange,
+        handleKeyExchange,
+        handleVerification
+    );
+    
+    // 4. Create answer
+    const answer = await manager.createSecureAnswer(offer);
+    
+    // 5. Encrypt answer for sharing
+    const password = EnhancedSecureCryptoUtils.generateSecurePassword();
+    const encryptedAnswer = await EnhancedSecureCryptoUtils.encryptData(answer, password);
+    
+    // 6. Share encrypted answer and password
+    await sendAnswerToPeer(encryptedAnswer);
+    await sendPasswordToPeer(password);
+    
+    // 7. Verify out-of-band codes
+    await verifySecurityCodes();
+    
+    // 8. Start secure communication
+    await manager.sendSecureMessage("Hello from responder!");
+}
+🔒 Security Considerations
+Key Security
+
+All keys are non-extractable - Cannot be exported from WebCrypto
+Hardware security module - Keys protected by browser's HSM
+Perfect Forward Secrecy - Old messages stay secure even if current keys compromised
+Automatic key rotation - Keys change every 5 minutes
+
+Message Security
+
+Authenticated encryption - AES-GCM provides confidentiality + integrity
+Metadata protection - Message metadata separately encrypted
+Replay protection - Sequence numbers prevent message replay
+Rate limiting - Prevents spam and DoS attacks
+
+Connection Security
+
+Out-of-band verification - Manual code verification prevents MITM
+Mutual authentication - Both parties prove identity
+Direct P2P - No intermediate servers to compromise
+WebRTC encryption - DTLS transport layer security
+
+Payment Security
+
+Lightning Network - No credit card or banking data exposure
+Preimage verification - Cryptographic proof of payment
+No payment data stored - Payments verified and discarded
+
+🐛 Error Handling
+Common Error Types
+typescript// Cryptographic errors
+class CryptoError extends Error {
+    constructor(message: string) {
+        super(`Crypto Error: ${message}`);
+        this.name = 'CryptoError';
+    }
+}
+
+// Connection errors  
+class ConnectionError extends Error {
+    constructor(message: string) {
+        super(`Connection Error: ${message}`);
+        this.name = 'ConnectionError';
+    }
+}
+
+// Payment errors
+class PaymentError extends Error {
+    constructor(message: string) {
+        super(`Payment Error: ${message}`);
+        this.name = 'PaymentError';
+    }
+}
+Error Recovery Patterns
+javascript// Robust message sending with retry
+async function sendMessageWithRetry(manager, message, maxRetries = 3) {
+    for (let attempt = 1; attempt <= maxRetries; attempt++) {
+        try {
+            await manager.sendSecureMessage(message);
+            return; // Success
+        } catch (error) {
+            console.warn(`Send attempt ${attempt} failed:`, error.message);
+            
+            if (error.message.includes('Session expired')) {
+                throw new PaymentError('Session expired - payment required');
+            }
+            
+            if (error.message.includes('Rate limit')) {
+                // Wait before retry
+                await new Promise(resolve => setTimeout(resolve, 1000 * attempt));
+                continue;
+            }
+            
+            if (attempt === maxRetries) {
+                throw error; // Final attempt failed
+            }
+        }
+    }
+}
+
+// Connection error handling
+function handleConnectionError(error) {
+    if (error.message.includes('MITM')) {
+        alert('⚠️ Security threat detected! Connection terminated.');
+        return 'security_threat';
+    }
+    
+    if (error.message.includes('timeout')) {
+        return 'timeout';
+    }
+    
+    if (error.message.includes('ice')) {
+        return 'nat_traversal';
+    }
+    
+    return 'unknown';
+}
+
+// Payment error handling
+function handlePaymentError(error) {
+    if (error.message.includes('preimage')) {
+        return 'invalid_payment';
+    }
+    
+    if (error.message.includes('expired')) {
+        return 'session_expired';
+    }
+    
+    if (error.message.includes('webln')) {
+        return 'webln_failed';
+    }
+    
+    return 'payment_failed';
+}
+🧪 Testing
+Unit Testing Examples
+javascript// Test encryption/decryption round-trip
+async function testEncryptionRoundTrip() {
+    const originalMessage = 'Test message for encryption';
+    const keys = await generateTestKeys();
+    
+    const encrypted = await EnhancedSecureCryptoUtils.encryptMessage(
+        originalMessage,
+        keys.encryptionKey,
+        keys.macKey,
+        keys.metadataKey,
+        'test-id',
+        0
+    );
+    
+    const decrypted = await EnhancedSecureCryptoUtils.decryptMessage(
+        encrypted,
+        keys.encryptionKey,
+        keys.macKey,
+        keys.metadataKey
+    );
+    
+    assert.equal(decrypted.message, originalMessage);
+    assert.equal(decrypted.messageId, 'test-id');
+    assert.equal(decrypted.sequenceNumber, 0);
+}
+
+// Test key generation
+async function testKeyGeneration() {
+    const ecdhPair = await EnhancedSecureCryptoUtils.generateECDHKeyPair();
+    const ecdsaPair = await EnhancedSecureCryptoUtils.generateECDSAKeyPair();
+    
+    // Verify key properties
+    assert.equal(ecdhPair.privateKey.algorithm.name, 'ECDH');
+    assert.equal(ecdhPair.privateKey.algorithm.namedCurve, 'P-384');
+    assert.equal(ecdhPair.privateKey.extractable, false);
+    
+    assert.equal(ecdsaPair.privateKey.algorithm.name, 'ECDSA');
+    assert.equal(ecdsaPair.privateKey.algorithm.namedCurve, 'P-384');
+    assert.equal(ecdsaPair.privateKey.extractable, false);
+}
+
+// Test signature verification
+async function testSignatureVerification() {
+    const keyPair = await EnhancedSecureCryptoUtils.generateECDSAKeyPair();
+    const data = 'Test data to sign';
+    
+    const signature = await EnhancedSecureCryptoUtils.signData(
+        keyPair.privateKey,
+        data
+    );
+    
+    const isValid = await EnhancedSecureCryptoUtils.verifySignature(
+        keyPair.publicKey,
+        signature,
+        data
+    );
+    
+    assert.equal(isValid, true);
+    
+    // Test with wrong data
+    const invalidVerification = await EnhancedSecureCryptoUtils.verifySignature(
+        keyPair.publicKey,
+        signature,
+        'Wrong data'
+    );
+    
+    assert.equal(invalidVerification, false);
+}
+
+// Helper function for tests
+async function generateTestKeys() {
+    const ecdhPair = await EnhancedSecureCryptoUtils.generateECDHKeyPair();
+    const salt = EnhancedSecureCryptoUtils.generateSalt();
+    
+    // For testing, we'll create a mock "remote" key pair
+    const remotePair = await EnhancedSecureCryptoUtils.generateECDHKeyPair();
+    
+    const sharedKeys = await EnhancedSecureCryptoUtils.deriveSharedKeys(
+        ecdhPair.privateKey,
+        remotePair.publicKey,
+        salt
+    );
+    
+    return sharedKeys;
+}
+Integration Testing
+javascript// Test full P2P connection flow
+async function testP2PConnection() {
+    let manager1Messages = [];
+    let manager2Messages = [];
+    
+    const manager1 = new EnhancedSecureWebRTCManager(
+        (msg, type) => manager1Messages.push({msg, type}),
+        (status) => console.log('Manager1 status:', status),
+        (fingerprint) => console.log('Manager1 fingerprint:', fingerprint),
+        (code) => console.log('Manager1 verification:', code)
+    );
+    
+    const manager2 = new EnhancedSecureWebRTCManager(
+        (msg, type) => manager2Messages.push({msg, type}),
+        (status) => console.log('Manager2 status:', status),
+        (fingerprint) => console.log('Manager2 fingerprint:', fingerprint),
+        (code) => console.log('Manager2 verification:', code)
+    );
+    
+    // Create offer
+    const offer = await manager1.createSecureOffer();
+    
+    // Create answer
+    const answer = await manager2.createSecureAnswer(offer);
+    
+    // Handle answer
+    await manager1.handleSecureAnswer(answer);
+    
+    // Wait for connection
+    await waitForConnection(manager1, manager2);
+    
+    // Verify both are connected
+    assert.equal(manager1.isConnected(), true);
+    assert.equal(manager2.isConnected(), true);
+    
+    // Test message exchange
+    await manager1.sendSecureMessage('Hello from manager1');
+    await manager2.sendSecureMessage('Hello from manager2');
+    
+    // Wait for messages to arrive
+    await new Promise(resolve => setTimeout(resolve, 1000));
+    
+    // Verify messages were received
+    assert.equal(manager2Messages.length > 0, true);
+    assert.equal(manager1Messages.length > 0, true);
+}
+
+async function waitForConnection(manager1, manager2, timeout = 10000) {
+    const start = Date.now();
+    
+    while (Date.now() - start < timeout) {
+        if (manager1.isConnected() && manager2.isConnected()) {
+            return;
+        }
+        await new Promise(resolve => setTimeout(resolve, 100));
+    }
+    
+    throw new Error('Connection timeout');
+}