pure_dart_quic 1.0.2

A pure Dart implementation of.3, HTTP/3, and WebTransport, including packet protection, handshake key derivation, QPACK, and WebTransport DATAGRAM support

Pure Dart QUIC + HTTP/3 + WebTransport

A pure Dart implementation of:

• QUIC transport
• TLS 1.3 over QUIC
• HTTP/3
• WebTransport
• WebTransport DATAGRAM
• basic QPACK / HTTP/3 SETTINGS handling

This project demonstrates a full end-to-end QUIC stack written in Dart, including:

• Initial secret derivation
• QUIC packet protection / header protection
• TLS handshake message exchange over QUIC CRYPTO frames
• 1-RTT key installation
• HTTP/3 control stream bootstrap
• WebTransport CONNECT
• WebTransport datagram echo

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Status

Implemented

• QUIC Initial / Handshake / 1-RTT packet protection
• Packet number spaces
• ACK generation and parsing
• CRYPTO frame reassembly
• TLS 1.3 handshake:
  • ClientHello
  • ServerHello
  • EncryptedExtensions
  • Certificate
  • CertificateVerify
  • Finished
• HTTP/3:
  • SETTINGS frame
  • control stream bootstrap
  • basic HEADERS / DATA framing
• QPACK:
  • static-table-based header encoding / decoding
• WebTransport:
  • Extended CONNECT
  • DATAGRAM frames
  • session establishment
  • datagram echo test
• Client bootstrap streams:
  • client control stream
  • client QPACK encoder stream
  • client QPACK decoder stream

---

What this project proves

This implementation is not just a toy packet parser — it demonstrates a real protocol stack capable of:

• speaking QUIC over UDP
• negotiating TLS 1.3 inside QUIC CRYPTO frames
• deriving handshake and application secrets correctly
• speaking HTTP/3 on top of QUIC
• establishing a WebTransport session
• exchanging WebTransport datagrams

It has been tested successfully:

• against the included pure Dart server
• against stricter real HTTP/3 / WebTransport servers

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Project structure

A simplified view of the important pieces:

lib/
├── buffer.dart
├── constants.dart
├── utils.dart
├── packet/
│   └── quic_packet.dart
├── frames/
│   └── quic_ack.dart
├── streams/
│   └── stream.dart
├── handshake/
│   ├── client_hello.dart
│   ├── server_hello.dart
│   └── tls_server_builder.dart
├── h3/
│   └── h3.dart
├── cipher/
│   ├── cert_utils.dart
│   ├── fingerprint.dart
│   ├── hash.dart
│   ├── hkdf.dart
│   └── x25519.dart
└── connection/
    ├── client/
    │   ├── client3.dart
    │   └── quic_session3.dart
    └── server/
        ├── server2.dart
        └── quic_server_session.dart