Allow handshaker to override QUIC transport parameters.

Due to randomized serialization of TransportParameters it is impossible for external ProofSource to guess the serialized output and compute the correct signature.
This CL allows ProofSource to pass back its version of transport parameters bitstring and uses it instead, if it's semantically equal.

No immediate prod behavior change: the default value of quic_transport_parameters is std::nullopt and parameters are left as is.

PiperOrigin-RevId: 489557924
7 files changed
tree: 90976dfc2ae549f8ba82c391b95cc3662cbff6f8
  1. build/
  2. depstool/
  3. quiche/
  4. .bazelrc
  5. BUILD.bazel
  10. WORKSPACE.bazel


QUICHE stands for QUIC, Http, Etc. It is Google‘s production-ready implementation of QUIC, HTTP/2, HTTP/3, and related protocols and tools. It powers Google’s servers, Chromium, Envoy, and other projects. It is actively developed and maintained.

There are two public QUICHE repositories. Either one may be used by embedders, as they are automatically kept in sync:

To embed QUICHE in your project, platform APIs need to be implemented and build files need to be created. Note that it is on the QUICHE team's roadmap to include default implementation for all platform APIs and to open-source build files. In the meanwhile, take a look at open source embedders like Chromium and Envoy to get started:

To contribute to QUICHE, follow instructions at

QUICHE is only supported on little-endian platforms.