Enable optional GRND_RANDOM flag to be passed to getrandom on Android.

Introduces optional extra flags for getrandom which are ORed in when
reading a FIPS seed.  Setting the Android read-only system property
ro.boringcrypto.hwrand to true will set the extra flags to GRND_RANDOM.

Testing: Built and tested on AOSP as http://r.android.com/1134926
and verified behaviour via the extra printfs in that CL and also
observing the flags passed to getrandom using strace.

Change-Id: Idd782df65ba0d49b8b1357b346caa4ef747587f1
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/38024
Reviewed-by: David Benjamin <davidben@google.com>
3 files changed
tree: 84b36af5f4cd466735127cae2c0fc9075988d430
  1. .clang-format
  2. .github/
  3. .gitignore
  6. BUILDING.md
  7. CMakeLists.txt
  9. FUZZING.md
  12. PORTING.md
  13. README.md
  14. STYLE.md
  15. codereview.settings
  16. crypto/
  17. decrepit/
  18. fuzz/
  19. go.mod
  20. include/
  21. sources.cmake
  22. ssl/
  23. third_party/
  24. tool/
  25. 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.

Project links:

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