Implement client certificates for TLS 1.3 in Go.

Tested by having client and server talk to each other. This adds the
certificate_extensions field to CertificateRequest which I'd previously
missed. (We completely ignore the field, with the expectation that the C
code won't have anything useful to do with it either.)

Change-Id: I74f96acd36747d4b6a6f533535e36ea8e94d2be8
Reviewed-by: David Benjamin <>
3 files changed
tree: 40d6c190ba52a509d1093d434bf9b57940404dcf
  1. .github/
  2. crypto/
  3. decrepit/
  4. fuzz/
  5. include/
  6. infra/
  7. ssl/
  8. third_party/
  9. tool/
  10. util/
  11. .clang-format
  12. .gitignore
  14. CMakeLists.txt
  15. codereview.settings


BoringSSL is a fork of OpenSSL that is designed to meet Google's needs.

Although BoringSSL is an open source project, it is not intended for general use, as OpenSSL is. We don't recommend that third parties depend upon it. Doing so is likely to be frustrating because there are no guarantees of API or ABI stability.

Programs ship their own copies of BoringSSL when they use it and we update everything as needed when deciding to make API changes. This allows us to mostly avoid compromises in the name of compatibility. It works for us, but it may not work for you.

BoringSSL arose because Google used OpenSSL for many years in various ways and, over time, built up a large number of patches that were maintained while tracking upstream OpenSSL. As Google's product portfolio became more complex, more copies of OpenSSL sprung up and the effort involved in maintaining all these patches in multiple places was growing steadily.

Currently BoringSSL is the SSL library in Chrome/Chromium, Android (but it's not part of the NDK) and a number of other apps/programs.

There are other files in this directory which might be helpful: