# @quicproquo/client

TypeScript SDK for [quicproquo](https://github.com/nicholasgasior/quicproquo) --
an E2E encrypted group messenger built on MLS (RFC 9420), hybrid post-quantum
key exchange (X25519 + ML-KEM-768), and sealed sender envelopes.

## Features

- **WASM-powered crypto** -- Ed25519 signatures, hybrid KEM, sealed sender,
  message padding, safety numbers -- all compiled from the Rust `quicproquo-core`
  crate via `wasm-pack`.
- **High-level client API** -- `QpqClient` wraps transport + crypto into a
  type-safe interface for resolving users, creating channels, and exchanging
  messages.
- **Offline mode** -- All crypto operations work without a server connection.
  Use `QpqClient.offline()` for key generation, signing, encryption, etc.
- **Transport abstraction** -- Pluggable `Transport` interface with a built-in
  `WebSocketTransport` for browser environments.

## Quick start

```typescript
import { QpqClient } from "@quicproquo/client";

// Crypto-only (no server needed)
const client = await QpqClient.offline();
const alice = client.generateIdentity();
const bob = client.generateIdentity();
const safetyNumber = client.computeSafetyNumber(alice.publicKey, bob.publicKey);
console.log("Safety number:", safetyNumber);

// Sign and verify
const msg = new TextEncoder().encode("hello");
const sig = client.sign(alice.seed, msg);
console.log("Valid:", client.verify(alice.publicKey, msg, sig));
```

## Server connection

The native qpq server speaks Cap'n Proto RPC over QUIC/TCP with Noise_XX.
Browsers cannot open raw TCP sockets, so a WebSocket bridge proxy is required
for full server connectivity:

```typescript
const client = await QpqClient.connect({ addr: "wss://bridge.example.com" });
const peerKey = await client.resolveUser("bob");
const channel = await client.createChannel(peerKey);
```

## Building

```bash
npm install
npm run build    # compiles to dist/
```

## Project structure

```
src/
  index.ts       -- public API exports
  client.ts      -- QpqClient class (high-level API)
  transport.ts   -- Transport interface + WebSocket implementation
  crypto.ts      -- WASM crypto wrapper
  types.ts       -- TypeScript type definitions
pkg/             -- WASM output (built by wasm-pack)
demo/            -- Browser demo page
```