Files
Chris Nennemann db46b72f58 feat: Sprint 3 — C FFI bindings, WASM compilation, Python example, SDK docs
- Create quicproquo-ffi crate with 7 extern "C" functions: connect,
  login, send, receive, disconnect, last_error, free_string
  (produces libquicproquo_ffi.so and .a)
- Feature-gate quicproquo-core for WASM: identity, hybrid_kem,
  safety_numbers, sealed_sender, app_message, padding, transcript
  all compile to wasm32-unknown-unknown
- Add Python ctypes example (examples/python/qpq_client.py) with
  QpqClient wrapper class and CLI
- Add SDK documentation: FFI reference, WASM guide, qpq-gen generators
- Update Dockerfile for quicproquo-ffi workspace member
2026-03-03 23:47:40 +01:00

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Markdown

# quicproquo Python FFI Client
Python wrapper around `libquicproquo_ffi` using `ctypes`.
## Build the FFI library
```bash
cargo build --release -p quicproquo-ffi
```
This produces:
- Linux: `target/release/libquicproquo_ffi.so`
- macOS: `target/release/libquicproquo_ffi.dylib`
- Windows: `target/release/quicproquo_ffi.dll`
## Usage
```bash
python examples/python/qpq_client.py \
--server 127.0.0.1:7000 \
--ca-cert server-cert.der \
--server-name localhost \
--username alice \
--password secret
```
### Send a message
```bash
python examples/python/qpq_client.py \
--server 127.0.0.1:7000 \
--ca-cert server-cert.der \
--username alice --password secret \
--send-to bob --message "hello from Python"
```
### Receive messages
```bash
python examples/python/qpq_client.py \
--server 127.0.0.1:7000 \
--ca-cert server-cert.der \
--username bob --password secret \
--receive --timeout 10000
```
## Library path
The script auto-detects the library in `target/release/` or `target/debug/`.
Override with `QPQ_FFI_LIB`:
```bash
export QPQ_FFI_LIB=/path/to/libquicproquo_ffi.so
```
## Programmatic usage
```python
from qpq_client import QpqClient, _find_library, _load_library
lib = _load_library(_find_library())
with QpqClient(lib) as client:
client.connect("127.0.0.1:7000", "server-cert.der", "localhost")
client.login("alice", "secret")
client.send("bob", "hello")
messages = client.receive(timeout_ms=5000)
```