securebit-chat/doc/CONTRIBUTING.md

Contributing to SecureBit.chat

🎉 Thank you for your interest in contributing to SecureBit.chat!

We're building the most secure P2P messenger with Lightning Network integration, and we need your help to make it even better.

🌟 Ways to Contribute

🐛 Bug Reports

Found a bug? Help us squash it!

💡 Feature Requests

Have an idea for improvement? We'd love to hear it!

🔒 Security Research

Help audit our cryptographic implementation

📖 Documentation

Improve guides, tutorials, and technical docs

🌍 Translations

Help make SecureBit.chat accessible worldwide

💻 Code Contributions

Submit pull requests for bug fixes and features

🚀 Getting Started

Prerequisites

• Browser: Modern browser with WebRTC and WebCrypto support
• Git: For version control
• Text Editor: VS Code, Vim, or your favorite editor
• Lightning Wallet: For testing payment features (optional)

Development Setup

``bash

1. Fork the repository on GitHub

2. Clone your fork

git clone https://github.com/yourusername/securebit-chat.git cd securebit-chat

3. Create a development branch

git checkout -b feature/your-feature-name

4. Start development server

python -m http.server 8000

or

npx serve .

5. Open http://localhost:8000

Make your changes

Test thoroughly

Commit with descriptive messages

git commit -m "feat: add quantum-resistant key exchange

• Implement CRYSTALS-Kyber for post-quantum security
• Add fallback to classical ECDH
• Update security level calculations
• Add comprehensive test suite

Closes #123" 📋 Contribution Guidelines 🔍 Before You Start

Check existing issues - avoid duplicate work Create an issue - discuss your idea first Get feedback - ensure alignment with project goals Fork and branch - work on a feature branch

💻 Code Standards JavaScript Style // ✅ Good const encryptionKey = await crypto.subtle.generateKey({ name: 'AES-GCM', length: 256 }, false, ['encrypt', 'decrypt']);

// ❌ Bad var key=crypto.subtle.generateKey({name:'AES-GCM',length:256},false,['encrypt','decrypt'])

Naming Conventions

Functions: camelCase - generateSecureKey() Classes: PascalCase - EnhancedSecureCryptoUtils Constants: UPPER_SNAKE_CASE - MAX_MESSAGE_LENGTH Files: kebab-case - crypto-utils.js

Documentation 🔒 Security Considerations Critical Areas These areas require extra careful review:

Cryptographic functions - All crypto code must be reviewed Key generation - Entropy and randomness Message handling - Input validation and sanitization P2P communication - WebRTC security Lightning integration - Payment verification

Security Checklist

No hardcoded secrets or keys Proper input validation Safe cryptographic practices No information leakage in logs Rate limiting where appropriate Memory cleanup for sensitive data

🧪 Testing Manual Testing

Test basic functionality

1. Create a connection
2. Send encrypted messages
3. Verify out-of-band codes
4. Test Lightning payments
5. Check security indicators

Security Testing

Test attack scenarios

1. MITM attack simulation
2. Replay attack prevention
3. Rate limiting effectiveness
4. Input validation edge cases
5. Cryptographic key isolation

📝 Commit Message Format We use Conventional Commits: [optional scope]:

[optional body]

[optional footer(s)]

Types:

feat: New feature fix: Bug fix docs: Documentation changes style: Code formatting refactor: Code restructuring test: Adding tests security: Security improvements perf: Performance improvements

Examples: feat(crypto): add quantum-resistant key exchange

fix(webrtc): resolve connection timeout issues

docs(api): update cryptographic architecture guide

security(auth): strengthen MITM protection

🔄 Pull Request Process

1. Pre-submission Checklist

Code follows style guidelines Security considerations addressed Documentation updated Commit messages follow convention No merge conflicts Testing completed

PR Template

Description

Brief description of changes

Type of Change

• Bug fix
• New feature
• Security improvement
• Documentation update
• Breaking change

Security Impact

• No security implications
• Security enhancement
• Requires security review

Testing

• Manual testing completed
• Security testing completed
• Cross-browser testing

Checklist

• Code follows project guidelines
• Self-review completed
• Documentation updated
• No sensitive data exposed

3. Review Process

Automated checks - CI/CD pipeline Code review - Maintainer review Security review - For crypto/security changes Testing - Manual verification Approval - Maintainer approval Merge - Squash and merge

🏷️ Issue Labels Priority

🔴 critical - Security vulnerabilities, major bugs 🟠 high - Important features, significant bugs 🟡 medium - General improvements 🟢 low - Minor enhancements, cleanup

Type

🐛 bug - Something isn't working ✨ enhancement - New feature request 🔒 security - Security-related 📖 documentation - Documentation improvements 🌍 translation - Internationalization 🧪 testing - Testing improvements

Status

🔍 investigating - Under investigation ✅ ready - Ready for development 🚧 in-progress - Being worked on ⏸️ blocked - Blocked by dependencies ❓ question - Needs clarification

🌍 Translation Guidelines Supported Languages

English (en) - Primary language Ukraine (ua) - Primary language Russian (ru) - Secondary language Spanish (es) - Community maintained Chinese (zh) - Community maintained

Translation Process

Check existing translations in /locales/ Create language file - locales/[lang].json Translate keys - Keep technical terms consistent Test in browser - Verify UI layout Submit PR - Follow contribution guidelines

Translation Keys json{ "header.title": "SecureBit.chat - Enhanced Security Edition", "security.level.high": "HIGH", "crypto.algorithm.ecdh": "ECDH P-384", "error.connection.failed": "Connection failed" } 🏆 Recognition Contributors Wall Outstanding contributors are featured in:

README.md - Contributors section Website - Hall of fame page Releases - Release notes credits

Contribution Rewards

Swag - Stickers, t-shirts for active contributors Early Access - Beta features and releases Lightning Tips - Small Bitcoin tips for quality contributions References - LinkedIn recommendations Conference Invites - Speaking opportunities

💬 Community Communication Channels

GitHub Discussions - Technical discussions GitHub Issues - Bug reports and features Email - lockbitchat@tutanota.com Security - security@SecureBit.chat

Code of Conduct We follow the Contributor Covenant:

Be respectful - Treat everyone with respect Be inclusive - Welcome diverse perspectives Be constructive - Provide helpful feedback Be patient - Remember everyone is learning

Getting Help

Documentation - Check /docs/ folder GitHub Discussions - Ask questions Email - Contact maintainers directly

📚 Resources Technical Documentation

Cryptographic Architecture API Reference Security Model Lightning Integration

External Resources

WebRTC Documentation Web Crypto API Lightning Network WebLN Specification

Ready to contribute? 🚀

Star the repository ⭐ Fork the project 🍴 Create your feature branch 🌟 Make your changes 💻 Submit a pull request 🔄

Thank you for helping make the internet more private and secure! 🛡️

docs/API.md

``markdown

SecureBit.chat API Documentation

🏗️ Architecture Overview

SecureBit.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 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 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 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; } decryptMessage() javascriptstatic async decryptMessage( encryptedPayload: EncryptedMessage, encryptionKey: CryptoKey, macKey: CryptoKey, metadataKey: CryptoKey, expectedSequenceNumber?: number ): Promise 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 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; } Digital Signatures signData() javascriptstatic async signData( privateKey: CryptoKey, data: string | Uint8Array ): Promise<number[]> Signs data with ECDSA P-384. verifySignature() javascriptstatic async verifySignature( publicKey: CryptoKey, signature: number[], data: string | Uint8Array ): Promise Verifies ECDSA signature. 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 Creates cryptographic proof for challenge response. 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. calculateSecurityLevel() javascriptstatic async calculateSecurityLevel(securityManager: any): Promise 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; } 🌐 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 ) Connection Management createSecureOffer() javascriptasync createSecureOffer(): Promise 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; } createSecureAnswer() javascriptasync createSecureAnswer(offerData: SecureOffer): Promise Creates encrypted response to connection offer. handleSecureAnswer() javascriptasync handleSecureAnswer(answerData: SecureAnswer): Promise Processes encrypted answer and establishes connection. Message Handling sendSecureMessage() javascriptasync sendSecureMessage(message: string): Promise 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

Connection States typescripttype ConnectionState = | 'disconnected' | 'connecting' | 'verifying' | 'connected' | 'failed' | 'reconnecting' | 'peer_disconnected'; Security Features calculateSecurityLevel() javascriptasync calculateSecurityLevel(): Promise 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). ⚡ 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 Returns: typescriptinterface LightningInvoice { amount: number; // satoshis memo: string; sessionType: string; timestamp: number; paymentHash: string; lightningAddress: string; } verifyPayment() javascriptasync verifyPayment(preimage: string, paymentHash: string): Promise Verifies Lightning payment preimage. 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 getTimeLeft() javascriptgetTimeLeft(): number Returns milliseconds remaining in current session. 🔧 Integration Examples Basic P2P Chat Setup javascript// Initialize WebRTC manager const webrtcManager = new EnhancedSecureWebRTCManager( (message, type) => console.log(${type}: ${message}), (status) => console.log(Status: ${status}), (fingerprint) => console.log(Key fingerprint: ${fingerprint}), (code) => console.log(Verification code: ${code}) );

// Create secure offer const offer = await webrtcManager.createSecureOffer(); console.log('Share this encrypted offer:', 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});

// Verify payment and activate session const preimage = 'user_provided_preimage'; const isValid = await sessionManager.verifyPayment(preimage, invoice.paymentHash);

if (isValid) { const session = sessionManager.activateSession('premium', preimage); console.log(Session active until: ${new Date(session.expiresAt)}); } Custom Cryptographic Operations javascript// Generate fresh key pairs const ecdhKeys = await EnhancedSecureCryptoUtils.generateECDHKeyPair(); const ecdsaKeys = await EnhancedSecureCryptoUtils.generateECDSAKeyPair();

// Create signature const data = 'Important message to sign'; const signature = await EnhancedSecureCryptoUtils.signData( ecdsaKeys.privateKey, data );

// Verify signature const isValid = await EnhancedSecureCryptoUtils.verifySignature( ecdsaKeys.publicKey, signature, data ); console.log('Signature valid:', isValid); 🔒 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 throw new Error('Key generation failed'); throw new Error('Encryption failed: invalid key'); throw new Error('Signature verification failed');

// Connection errors
throw new Error('WebRTC connection failed'); throw new Error('MITM attack detected'); throw new Error('Session expired');

// Payment errors throw new Error('Invalid payment preimage'); throw new Error('Session not paid'); throw new Error('Lightning verification failed'); Error Recovery javascripttry { await webrtcManager.sendSecureMessage(message); } catch (error) { if (error.message.includes('Session expired')) { // Redirect to payment showPaymentModal(); } else if (error.message.includes('Rate limit')) { // Show rate limit warning showRateLimitWarning(); } else { // Generic error handling console.error('Message send failed:', error); } } 🧪 Testing Unit Testing Examples javascript// Test encryption/decryption const originalMessage = 'Test message'; const encrypted = await EnhancedSecureCryptoUtils.encryptMessage( originalMessage, encKey, macKey, metaKey, 'test-id', 0 ); const decrypted = await EnhancedSecureCryptoUtils.decryptMessage( encrypted, encKey, macKey, metaKey ); assert.equal(decrypted.message, originalMessage);

// Test key generation const keyPair = await EnhancedSecureCryptoUtils.generateECDHKeyPair(); assert.equal(keyPair.privateKey.algorithm.name, 'ECDH'); assert.equal(keyPair.privateKey.extractable, false); Integration Testing javascript// Test full P2P flow const manager1 = new EnhancedSecureWebRTCManager(/.../); const manager2 = new EnhancedSecureWebRTCManager(/.../);

const offer = await manager1.createSecureOffer(); const answer = await manager2.createSecureAnswer(offer); await manager1.handleSecureAnswer(answer);

// Both should be connected assert.equal(manager1.isConnected(), true); assert.equal(manager2.isConnected(), true); 📊 Performance Metrics Cryptographic Performance

Key Generation: ~50ms (ECDH P-384) Encryption: ~5ms per message Signature: ~20ms (ECDSA P-384) Key Derivation: ~30ms (HKDF)

Connection Performance

WebRTC Setup: 2-5 econds (depends on NAT)

Key Exchange: ~100ms total First Message: ~500ms (includes verification) Subsequent Messages: ~10ms

Memory Usage

Base Application: ~2MB Active Connection: +1MB (keys, buffers) Message History: ~1KB per message Total Runtime: ~5-10MB typical

🔍 Debugging Debug Logging javascript// Enable debug mode EnhancedSecureCryptoUtils.secureLog.log('info', 'Debug message', { keySize: 256, algorithm: 'AES-GCM' });

// View security logs const logs = EnhancedSecureCryptoUtils.secureLog.getLogs('error'); console.table(logs);

// Monitor security level changes webrtcManager.calculateSecurityLevel().then(level => { console.log('Security verification results:'); Object.entries(level.verificationResults).forEach(([check, result]) => { console.log(${check}: ${result.passed ? '✅' : '❌'} ${result.details}); }); }); Connection Debugging javascript// Monitor connection state changes const webrtcManager = new EnhancedSecureWebRTCManager( (message, type) => console.log(Message [${type}]: ${message}), (status) => { console.log(Connection state: ${status}); if (status === 'failed') { console.log('Connection info:', webrtcManager.getConnectionInfo()); } }, (fingerprint) => console.log(Key fingerprint: ${fingerprint}), (code) => console.log(Verification code: ${code}) );

// Check WebRTC connection details console.log('Ice connection state:', webrtcManager.peerConnection?.iceConnectionState); console.log('Connection state:', webrtcManager.peerConnection?.connectionState); Payment Debugging javascript// Debug Lightning payments const sessionManager = new PayPerSessionManager();

// Check session status console.log('Has active session:', sessionManager.hasActiveSession()); console.log('Time left:', sessionManager.getTimeLeft());

// Verify payment manually const invoice = sessionManager.createInvoice('premium'); console.log('Invoice details:', { amount: invoice.amount, hash: invoice.paymentHash, address: invoice.lightningAddress }); Feature Detection javascript// Check WebRTC support const hasWebRTC = !!(window.RTCPeerConnection || window.webkitRTCPeerConnection || window.mozRTCPeerConnection);

// Check WebCrypto support const hasWebCrypto = !!(window.crypto && window.crypto.subtle);

// Check WebLN support const hasWebLN = !!(window.webln);

console.log('Browser capabilities:', { webrtc: hasWebRTC, webcrypto: hasWebCrypto, webln: hasWebLN }); Polyfills javascript// WebRTC adapter for cross-browser compatibility // Include: https://webrtc.github.io/adapter/adapter-latest.js

// WebCrypto polyfill for older browsers if (!window.crypto?.subtle) { console.error('WebCrypto not supported - security features disabled'); } 🚀 Advanced Usage Custom Security Validation javascript// Implement custom security checks class CustomSecurityValidator { static async validateConnection(webrtcManager) { const securityLevel = await webrtcManager.calculateSecurityLevel();

    // Enforce minimum security requirements
    if (securityLevel.score < 80) {
        throw new Error(`Security level too low: ${securityLevel.score}%`);
    }
    
    // Check specific security features
    const { verificationResults } = securityLevel;
    if (!verificationResults.encryption?.passed) {
        throw new Error('Encryption verification failed');
    }
    
    if (!verificationResults.pfs?.passed) {
        console.warn('Perfect Forward Secrecy not active');
    }
    
    return true;
}

}

// Use custom validator try { await CustomSecurityValidator.validateConnection(webrtcManager); console.log('Security validation passed'); } catch (error) { console.error('Security validation failed:', error.message); } Custom Message Protocols javascript// Implement custom message types class CustomMessageProtocol { static async sendFileShare(webrtcManager, fileData, fileName) { const message = JSON.stringify({ type: 'file_share', fileName: fileName, fileSize: fileData.length, data: Array.from(new Uint8Array(fileData)) });

    // Split large messages if needed
    const maxSize = 1500; // bytes
    if (message.length > maxSize) {
        return this.sendChunkedMessage(webrtcManager, message);
    }
    
    return webrtcManager.sendSecureMessage(message);
}

static async sendChunkedMessage(webrtcManager, largeMessage) {
    const chunks = [];
    const chunkSize = 1000;
    const messageId = Date.now().toString();
    
    for (let i = 0; i < largeMessage.length; i += chunkSize) {
        chunks.push({
            type: 'chunk',
            messageId: messageId,
            index: Math.floor(i / chunkSize),
            total: Math.ceil(largeMessage.length / chunkSize),
            data: largeMessage.slice(i, i + chunkSize)
        });
    }
    
    // Send chunks sequentially
    for (const chunk of chunks) {
        await webrtcManager.sendSecureMessage(JSON.stringify(chunk));
        await new Promise(resolve => setTimeout(resolve, 100)); // Rate limiting
    }
}

} Session Management javascript// Advanced session management class AdvancedSessionManager extends PayPerSessionManager { constructor() { super(); this.sessionHistory = []; this.analytics = { totalSessions: 0, totalSatsSpent: 0, averageSessionLength: 0 }; }

activateSession(sessionType, preimage) {
    const session = super.activateSession(sessionType, preimage);
    
    // Track session history
    this.sessionHistory.push({
        type: sessionType,
        startTime: session.startTime,
        duration: this.sessionPrices[sessionType].hours * 3600000,
        cost: this.sessionPrices[sessionType].sats
    });
    
    // Update analytics
    this.updateAnalytics();
    
    return session;
}

updateAnalytics() {
    this.analytics.totalSessions = this.sessionHistory.length;
    this.analytics.totalSatsSpent = this.sessionHistory.reduce(
        (sum, session) => sum + session.cost, 0
    );
    this.analytics.averageSessionLength = this.sessionHistory.reduce(
        (sum, session) => sum + session.duration, 0
    ) / this.sessionHistory.length;
}

getSessionAnalytics() {
    return {
        ...this.analytics,
        sessionsThisMonth: this.getSessionsInPeriod(30),
        averageCostPerHour: this.calculateAverageCostPerHour()
    };
}

getSessionsInPeriod(days) {
    const cutoff = Date.now() - (days * 24 * 60 * 60 * 1000);
    return this.sessionHistory.filter(s => s.startTime > cutoff).length;
}

calculateAverageCostPerHour() {
    const totalHours = this.sessionHistory.reduce(
        (sum, session) => sum + (session.duration / 3600000), 0
    );
    return totalHours > 0 ? this.analytics.totalSatsSpent / totalHours : 0;
}

} 📱 Mobile Integration PWA Support javascript// Service worker for offline capability // sw.js self.addEventListener('install', event => { event.waitUntil( caches.open('securebit-chat-v1').then(cache => { return cache.addAll([ '/', '/index.html', '/manifest.json' ]); }) ); });

// Mobile-specific optimizations class MobileOptimizations { static detectMobile() { return /Android|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test( navigator.userAgent ); }

static optimizeForMobile(webrtcManager) {
    if (this.detectMobile()) {
        // Reduce message history for memory
        webrtcManager.maxMessageHistory = 50;
        
        // More aggressive cleanup
        webrtcManager.cleanupInterval = 30000; // 30 seconds
        
        // Battery optimization
        webrtcManager.heartbeatInterval = 60000; // 1 minute
    }
}

} Mobile Wallet Integration javascript// Deep link integration for mobile Lightning wallets class MobileLightningIntegration { static async payInvoice(invoice) { const lightningUrl = lightning:${invoice.lightningAddress}?amount=${invoice.amount}&message=${encodeURIComponent(invoice.memo)};

    if (this.isMobile()) {
        // Try to open Lightning app
        window.location.href = lightningUrl;
        
        // Fallback to clipboard copy
        setTimeout(() => {
            navigator.clipboard.writeText(lightningUrl).then(() => {
                alert('Lightning invoice copied to clipboard');
            });
        }, 1000);
    } else {
        // Desktop: try WebLN first
        if (window.webln) {
            try {
                await window.webln.enable();
                return await window.webln.sendPayment(invoice);
            } catch (error) {
                console.log('WebLN failed, falling back to manual');
            }
        }
        
        // Manual payment flow
        this.showManualPaymentDialog(invoice);
    }
}

static isMobile() {
    return /Android|iPhone|iPad|iPod/i.test(navigator.userAgent);
}

} 🔧 Configuration Environment Configuration javascript// Configuration object const LockBitConfig = { // Cryptographic settings crypto: { keySize: 256, curve: 'P-384', hashAlgorithm: 'SHA-384', keyRotationInterval: 300000, // 5 minutes maxOldKeys: 3 },

// Connection settings
connection: {
    iceServers: [
        { urls: 'stun:stun.l.google.com:19302' },
        { urls: 'stun:stun1.l.google.com:19302' }
    ],
    maxRetries: 3,
    heartbeatInterval: 30000,
    connectionTimeout: 10000
},

// Security settings
security: {
    maxMessageLength: 2000,
    rateLimitMessages: 60, // per minute
    rateLimitConnections: 5, // per 5 minutes
    sessionMaxAge: 3600000, // 1 hour
    verificationCodeLength: 6
},

// Lightning settings
lightning: {
    defaultAddress: 'lockbitchat@tutanota.com',
    invoiceExpiry: 3600, // 1 hour
    minPayment: 1, // 1 satoshi
    maxPayment: 10000 // 10000 satoshis
},

// UI settings
ui: {
    maxMessagesDisplayed: 100,
    messageHistoryLimit: 1000,
    animationDuration: 200,
    scrollThreshold: 100
}

};

// Apply configuration EnhancedSecureCryptoUtils.config = LockBitConfig.crypto; PayPerSessionManager.config = LockBitConfig.lightning; Custom Configuration javascript// Override default settings const customConfig = { ...LockBitConfig, crypto: { ...LockBitConfig.crypto, keyRotationInterval: 600000 // 10 minutes instead of 5 }, security: { ...LockBitConfig.security, maxMessageLength: 5000 // Longer messages } };

// Apply custom configuration LockBitChat.configure(customConfig); 📈 Analytics & Monitoring Security Metrics javascript// Security monitoring dashboard class SecurityMonitor { constructor() { this.metrics = { connectionsTotal: 0, connectionsFailed: 0, messagesEncrypted: 0, keyRotations: 0, mitmattempts: 0, averageSecurityScore: 0 }; }

recordConnection(success) {
    this.metrics.connectionsTotal++;
    if (!success) {
        this.metrics.connectionsFailed++;
    }
}

recordMessage() {
    this.metrics.messagesEncrypted++;
}

recordKeyRotation() {
    this.metrics.keyRotations++;
}

recordSecurityScore(score) {
    this.metrics.averageSecurityScore = 
        (this.metrics.averageSecurityScore + score) / 2;
}

getSecurityReport() {
    return {
        ...this.metrics,
        connectionSuccessRate: this.metrics.connectionsTotal > 0 ? 
            1 - (this.metrics.connectionsFailed / this.metrics.connectionsTotal) : 0,
        securityGrade: this.getSecurityGrade()
    };
}

getSecurityGrade() {
    const score = this.metrics.averageSecurityScore;
    if (score >= 90) return 'A+';
    if (score >= 80) return 'A';
    if (score >= 70) return 'B';
    if (score >= 60) return 'C';
    return 'F';
}

}

// Usage const monitor = new SecurityMonitor(); webrtcManager.on('connection', (success) => monitor.recordConnection(success)); webrtcManager.on('message', () => monitor.recordMessage()); 🔄 Migration & Updates Version Migration javascript// Handle version migrations class VersionMigration { static getCurrentVersion() { return localStorage.getItem('lockbit-version') || '4.0.0'; }

static async migrateToLatest() {
    const currentVersion = this.getCurrentVersion();
    const latestVersion = '4.0.0';
    
    if (this.compareVersions(currentVersion, latestVersion) < 0) {
        await this.performMigration(currentVersion, latestVersion);
        localStorage.setItem('lockbit-version', latestVersion);
    }
}

static async performMigration(from, to) {
    console.log(`Migrating from ${from} to ${to}`);
    
    // Clear old data that might be incompatible
    if (this.compareVersions(from, '4.0.0') < 0) {
        localStorage.removeItem('lockbit-session-data');
        console.log('Cleared incompatible session data');
    }
    
    // Future migrations would go here
}

static compareVersions(a, b) {
    const aParts = a.split('.').map(Number);
    const bParts = b.split('.').map(Number);
    
    for (let i = 0; i < Math.max(aParts.length, bParts.length); i++) {
        const aPart = aParts[i] || 0;
        const bPart = bParts[i] || 0;
        
        if (aPart < bPart) return -1;
        if (aPart > bPart) return 1;
    }
    
    return 0;
}

}

// Run migration on startup VersionMigration.migrateToLatest();

📞 Support & Community Getting Help

Documentation: Full API docs at /docs/ GitHub Issues: Bug reports and feature requests Community: Discussions and Q&A Security: security@SecureBit.chat for vulnerabilities

Contributing

Code: Submit PRs following contribution guidelines Documentation: Help improve these docs Security: Audit cryptographic implementations Testing: Help test new features

Roadmap

v4.5: Native mobile/desktop apps v5.0: Quantum-resistant cryptography v5.5: Group chat support v6.0: Fully decentralized network

This API documentation is continuously updated. Last revision: January 2025