Fix ABI error in bn_mul_mont on aarch64.

This was caught by an aarch64 ABI tester. aarch64 has the same
considerations around small arguments as x86_64 does. The aarch64
version of bn_mul_mont does not mask off the upper words of the

The x86_64 version does, so size_t is, strictly speaking, wrong for
aarch64, but bn_mul_mont already has an implicit size limit to support
its internal alloca, so this doesn't really make things worse than

Change-Id: I39bffc8fdb2287e45a2d1f0d1b4bd5532bbf3868
Commit-Queue: David Benjamin <>
Reviewed-by: Adam Langley <>
3 files changed
tree: 804415492d150e900089a90f5c52feca21882aaa
  1. .clang-format
  2. .github/
  3. .gitignore
  7. CMakeLists.txt
  15. codereview.settings
  16. crypto/
  17. decrepit/
  18. fipstools/
  19. fuzz/
  20. go.mod
  21. include/
  22. sources.cmake
  23. ssl/
  24. third_party/
  25. tool/
  26. util/


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: