CryptoLogin Client SDK

Zero-Storage Authentication Client SDK - The server knows absolutely nothing about your users.

Client-side JavaScript SDK for CryptoLogin - Zero-Knowledge-Inspired Passwordless Authentication.

The time is now ripe for it

Stop storing password hashes. With CryptoLogin, the server only stores encrypted challenges. The master secret is used once at registration, then forgotten. At login, no secret ever crosses the network.

CryptoLogin uses a challenge-response mechanism inspired by Zero-Knowledge principles. The server never stores your secret. Your secret never leaves your device.

🚀 Quick Start

´´´bash npm install cryptologin-client

import { createClient, deriveUserId } from "cryptologin-client";

// Initialize
const client = createClient({
  baseURL: "https://your-api.com/api/v1",
});

// Register
const userId = await deriveUserId("your-master-secret-min-32-chars.");
await client.register(userId);

// Login
const session = await client.login(userId, "your-master-secret-min-32-chars.");
console.log("Authenticated:", session.authenticated);

🔒 Security Model

Feature	Traditional Auth	CryptoLogin
Password storage	Hashed on server	Never stored
Database breach impact	Credentials exposed	Nothing to steal
"Forgot Password"	Email reset	Impossible by design
User sovereignty	Low	Absolute

CryptoLogin uses a Zero-Storage Authentication model:

1. Client-side derivation: The user_id is derived from master_secret using PBKDF2-SHA512 (100,000 iterations)
2. Challenge-Response: Server generates encrypted challenges using AES-256-GCM
3. Local decryption: Client decrypts challenges locally - master_secret NEVER leaves the browser
4. No server secrets: Server stores only encrypted tokens, not passwords or secrets

Cryptographic Standards

• Key Derivation: PBKDF2-SHA512 (100,000 iterations)
• Encryption: AES-256-GCM
• Hashing: SHA-256

⚠️ Important Trade-offs

CryptoLogin is NOT for everyone:

• ❌ No "Forgot Password" flow (server knows nothing)
• ❌ If user loses master_secret, account is permanently locked
• ✅ Absolute data sovereignty
• ✅ Zero server-side secrets to steal
• ✅ Immune to database breaches

This is a deliberate design choice, not a bug.

Features

• 🔐 Passwordless Authentication - No email, no password required
• 🛡️ Zero-Knowledge-Inspired - Your secret never leaves your browser
• ⚡ Web Crypto API - Uses native browser cryptography
• 📦 Lightweight - ~3KB minified
• 🔧 TypeScript Support - Full type definitions included
• 🌐 Universal - Works in browsers and Node.js

Installation

npm install cryptologin-client
# or
yarn add cryptologin-client
# or
pnpm add cryptologin-client

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📖 API Documentation

API Reference

Option	Type	Default	Description
baseURL	string	Required	Your CryptoLogin API URL
timeout	number	10000	Timeout in milliseconds
onError	function	null	Error callback

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createClient(options)

Creates a new CryptoLogin client.

const client = createClient({
  baseURL: "https://api.example.com/v1", // Required
  timeout: 30000, // Optional, default: 30000ms
});

deriveUserId(masterSecret)

Derives a unique user ID from the master secret. Minimum 32 characters required.

const userId = await deriveUserId("my-super-secret-passphrase-1234567890");
// Returns: 64-character hex string

client.register(userId)

Registers a new user with the server.

const result = await client.register(userId);
// Returns: { success: true, userId: '...' }
});

client.login(userId, masterSecret)

Authenticates the user using challenge-response.

const session = await client.login(userId, masterSecret);
// Returns: { authenticated: true, sessionId: '...' }

client.logout()

Logs out the current user.

await client.logout();

Session Management

import { saveSession, loadSession, clearSession } from "cryptologin-client";

// Save session after login
saveSession(session);

// Load existing session
const session = loadSession();

// Clear session (logout)
clearSession();

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🧪 Development & Testing

# Install dependencies
npm install

# Run tests
npm test

# Run tests with coverage
npm run test:coverage

# Watch mode
npm test -- --watch

📦 Publishing

npm version patch  # or minor/major
npm publish

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🤝 Contributing

Contributions are welcome! Please read our Contributing Guide for details.

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📄 License

MIT © erabytse

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Author

erabytse

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🔗 Links

. Server SDK (Python): cryptologin on PyPI

. CryptoLogin GitHub

. Live Demo

. Website: cryptologin-website

. PyPI Package

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Built with ❤️ by erabytse

Reinventing Authentication. One Secret at a Time.

A quiet rebellion against digital waste.