feat: Sprint 8 — TypeScript SDK with WASM crypto and browser demo

- WASM crypto bundle (175KB): 13 wasm_bindgen functions wrapping
  quicproquo-core's Ed25519 identity, X25519+ML-KEM-768 hybrid KEM,
  safety numbers, sealed sender, and message padding
- @quicproquo/client TypeScript SDK: QpqClient class with connect,
  health, resolveUser, createChannel, send/sendWithTTL, receive,
  deleteAccount; WebSocket transport with request/response correlation
  and reconnection; ergonomic crypto.ts wrapper over WASM functions
- Browser demo: vanilla HTML page with interactive crypto operations
  (identity gen, safety numbers, sign/verify, hybrid encrypt/decrypt,
  sealed sender, padding) and chat UI for server connectivity
- Offline mode: crypto operations work without server connection

TypeScript strict mode, 0 errors. WASM bundle size optimized (lto + opt-level=s).
This commit is contained in:
2026-03-04 01:28:38 +01:00
parent 65ff26235e
commit 28ceaaf072
14 changed files with 2264 additions and 0 deletions

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View File

@@ -0,0 +1,21 @@
[package]
name = "qpq-wasm-crypto"
version = "0.1.0"
edition = "2021"
description = "WASM bindings for quicproquo crypto primitives"
license = "MIT"
[lib]
crate-type = ["cdylib", "rlib"]
[dependencies]
wasm-bindgen = "0.2"
quicproquo-core = { path = "../../../crates/quicproquo-core", default-features = false }
js-sys = "0.3"
# Standalone crate — not part of the workspace.
[workspace]
[profile.release]
opt-level = "s"
lto = true

View File

@@ -0,0 +1,162 @@
//! WASM bindings for quicproquo crypto primitives.
//!
//! Exposes Ed25519 identity keys, hybrid X25519+ML-KEM-768, safety numbers,
//! sealed sender envelopes, and message padding to JavaScript via wasm-bindgen.
use wasm_bindgen::prelude::*;
// ── Identity (Ed25519) ──────────────────────────────────────────────────────
/// Generate a fresh Ed25519 identity keypair. Returns the 32-byte seed.
#[wasm_bindgen]
pub fn generate_identity() -> Vec<u8> {
let kp = quicproquo_core::IdentityKeypair::generate();
kp.seed_bytes().to_vec()
}
/// Derive the 32-byte Ed25519 public key from a 32-byte seed.
#[wasm_bindgen]
pub fn identity_public_key(seed: &[u8]) -> Result<Vec<u8>, JsError> {
let seed: [u8; 32] = seed
.try_into()
.map_err(|_| JsError::new("seed must be exactly 32 bytes"))?;
let kp = quicproquo_core::IdentityKeypair::from_seed(seed);
Ok(kp.public_key_bytes().to_vec())
}
/// Sign a message with an Ed25519 seed. Returns the 64-byte signature.
#[wasm_bindgen]
pub fn sign(seed: &[u8], message: &[u8]) -> Result<Vec<u8>, JsError> {
let seed: [u8; 32] = seed
.try_into()
.map_err(|_| JsError::new("seed must be exactly 32 bytes"))?;
let kp = quicproquo_core::IdentityKeypair::from_seed(seed);
Ok(kp.sign_raw(message).to_vec())
}
/// Verify an Ed25519 signature. Returns true if valid.
#[wasm_bindgen]
pub fn verify(public_key: &[u8], message: &[u8], signature: &[u8]) -> Result<bool, JsError> {
let pk: [u8; 32] = public_key
.try_into()
.map_err(|_| JsError::new("public key must be exactly 32 bytes"))?;
let sig: [u8; 64] = signature
.try_into()
.map_err(|_| JsError::new("signature must be exactly 64 bytes"))?;
match quicproquo_core::IdentityKeypair::verify_raw(&pk, message, &sig) {
Ok(()) => Ok(true),
Err(_) => Ok(false),
}
}
// ── Hybrid KEM (X25519 + ML-KEM-768) ───────────────────────────────────────
/// Generate a hybrid keypair. Returns serialized bytes:
/// private_key(2432) || public_key(1216).
///
/// Private key layout: x25519_sk(32) || mlkem_dk(2400)
/// Public key layout: x25519_pk(32) || mlkem_ek(1184)
#[wasm_bindgen]
pub fn hybrid_generate_keypair() -> Vec<u8> {
let kp = quicproquo_core::HybridKeypair::generate();
let private_bytes = kp.private_to_bytes(); // 2432 bytes
let public_bytes = kp.public_key().to_bytes(); // 1216 bytes
let mut out = Vec::with_capacity(private_bytes.len() + public_bytes.len());
out.extend_from_slice(&private_bytes);
out.extend_from_slice(&public_bytes);
out
}
/// Extract the public key (1216 bytes) from a hybrid keypair blob.
#[wasm_bindgen]
pub fn hybrid_public_key(keypair_blob: &[u8]) -> Result<Vec<u8>, JsError> {
// Private key is 2432 bytes, public key starts at offset 2432
if keypair_blob.len() != 2432 + 1216 {
return Err(JsError::new("keypair blob must be exactly 3648 bytes"));
}
Ok(keypair_blob[2432..].to_vec())
}
/// Encrypt plaintext to a hybrid public key (1216 bytes).
/// Returns the encrypted envelope.
#[wasm_bindgen]
pub fn hybrid_encrypt(public_key: &[u8], plaintext: &[u8]) -> Result<Vec<u8>, JsError> {
let pk = quicproquo_core::HybridPublicKey::from_bytes(public_key)
.map_err(|e| JsError::new(&format!("invalid hybrid public key: {e}")))?;
quicproquo_core::hybrid_encrypt(&pk, plaintext, b"", b"")
.map_err(|e| JsError::new(&format!("encryption failed: {e}")))
}
/// Decrypt a hybrid envelope using the private key portion (first 2432 bytes of keypair blob).
#[wasm_bindgen]
pub fn hybrid_decrypt(keypair_blob: &[u8], envelope: &[u8]) -> Result<Vec<u8>, JsError> {
// Accept either full blob (3648) or just private key (2432)
let private_bytes = if keypair_blob.len() == 2432 + 1216 {
&keypair_blob[..2432]
} else if keypair_blob.len() == 2432 {
keypair_blob
} else {
return Err(JsError::new(
"keypair must be 2432 (private only) or 3648 (full blob) bytes",
));
};
let kp = quicproquo_core::HybridKeypair::from_private_bytes(private_bytes)
.map_err(|e| JsError::new(&format!("invalid hybrid private key: {e}")))?;
quicproquo_core::hybrid_decrypt(&kp, envelope, b"", b"")
.map_err(|e| JsError::new(&format!("decryption failed: {e}")))
}
// ── Safety numbers ──────────────────────────────────────────────────────────
/// Compute a 60-digit safety number from two 32-byte Ed25519 public keys.
/// Returns a string of 12 space-separated 5-digit groups.
/// Result is symmetric: compute_safety_number(a, b) === compute_safety_number(b, a).
#[wasm_bindgen]
pub fn compute_safety_number(key_a: &[u8], key_b: &[u8]) -> Result<String, JsError> {
let a: [u8; 32] = key_a
.try_into()
.map_err(|_| JsError::new("key_a must be exactly 32 bytes"))?;
let b: [u8; 32] = key_b
.try_into()
.map_err(|_| JsError::new("key_b must be exactly 32 bytes"))?;
Ok(quicproquo_core::safety_numbers::compute_safety_number(&a, &b))
}
// ── Sealed sender ───────────────────────────────────────────────────────────
/// Wrap a payload in a sealed sender envelope (magic + sender key + Ed25519 signature + payload).
/// `seed` is the 32-byte Ed25519 identity seed.
#[wasm_bindgen]
pub fn seal(seed: &[u8], payload: &[u8]) -> Result<Vec<u8>, JsError> {
let seed: [u8; 32] = seed
.try_into()
.map_err(|_| JsError::new("seed must be exactly 32 bytes"))?;
let kp = quicproquo_core::IdentityKeypair::from_seed(seed);
Ok(quicproquo_core::sealed_sender::seal(&kp, payload))
}
/// Unseal a sealed sender envelope. Returns sender_public_key(32) || inner_payload.
#[wasm_bindgen]
pub fn unseal(envelope: &[u8]) -> Result<Vec<u8>, JsError> {
let (sender_key, inner) = quicproquo_core::sealed_sender::unseal(envelope)
.map_err(|e| JsError::new(&format!("unseal failed: {e}")))?;
let mut out = Vec::with_capacity(32 + inner.len());
out.extend_from_slice(&sender_key);
out.extend_from_slice(&inner);
Ok(out)
}
// ── Padding ─────────────────────────────────────────────────────────────────
/// Pad a message to a fixed bucket size (256, 1024, 4096, or 16384 bytes).
#[wasm_bindgen]
pub fn pad_message(data: &[u8]) -> Vec<u8> {
quicproquo_core::padding::pad(data)
}
/// Remove padding and recover the original message.
#[wasm_bindgen]
pub fn unpad_message(data: &[u8]) -> Result<Vec<u8>, JsError> {
quicproquo_core::padding::unpad(data)
.map_err(|e| JsError::new(&format!("unpad failed: {e}")))
}