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:
<type>[optional scope]: <description>

[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<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;
}
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;
}
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<boolean>
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<AuthProof>
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<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;
}
🌐 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<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;
}
createSecureAnswer()
javascriptasync createSecureAnswer(offerData: SecureOffer): Promise<SecureAnswer>
Creates encrypted response to connection offer.
handleSecureAnswer()
javascriptasync handleSecureAnswer(answerData: SecureAnswer): Promise<void>
Processes encrypted answer and establishes connection.
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

Connection States
typescripttype ConnectionState = 
    | 'disconnected'
    | 'connecting' 
    | 'verifying'
    | 'connected'
    | 'failed'
    | 'reconnecting'
    | '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).
⚡ 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<boolean>
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