Vectorize gcm_mul32_nohw and replace gcm_gmult_4bit_mmx.

This shrinks the perf gap between nohw and 4bit_mmx. Replace 4bit_mmx
and fix the last remaining variable-time GHASH implementation, covering
32-bit x86 without SSSE3.

Did 2065000 AES-128-GCM (16 bytes) seal operations in 1000154us (2064682.0 ops/sec): 33.0 MB/s
Did 368000 AES-128-GCM (256 bytes) seal operations in 1002435us (367106.1 ops/sec): 94.0 MB/s
Did 77000 AES-128-GCM (1350 bytes) seal operations in 1001225us (76905.8 ops/sec): 103.8 MB/s
Did 14000 AES-128-GCM (8192 bytes) seal operations in 1067523us (13114.5 ops/sec): 107.4 MB/s
Did 6572 AES-128-GCM (16384 bytes) seal operations in 1015976us (6468.7 ops/sec): 106.0 MB/s
Did 1995000 AES-128-GCM (16 bytes) seal operations in 1000374us (1994254.1 ops/sec): 31.9 MB/s
Did 319000 AES-128-GCM (256 bytes) seal operations in 1000196us (318937.5 ops/sec): 81.6 MB/s
Did 66000 AES-128-GCM (1350 bytes) seal operations in 1002823us (65814.2 ops/sec): 88.8 MB/s
Did 12000 AES-128-GCM (8192 bytes) seal operations in 1079294us (11118.4 ops/sec): 91.1 MB/s
Did 5511 AES-128-GCM (16384 bytes) seal operations in 1006218us (5476.9 ops/sec): 89.7 MB/s
(Note fallback AES is dampening the perf hit. Pairing with AESNI to
roughly isolate GHASH shows a 40% hit.)

That just leaves aes_nohw...

Change-Id: I7d842806c54a5a057895fa2e7665633330e34b72
Reviewed-by: Adam Langley <>
Commit-Queue: David Benjamin <>
5 files changed
tree: a446ebc3356014b4bab0177e72ccf95947471324
  1. .clang-format
  2. .github/
  3. .gitignore
  7. CMakeLists.txt
  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:

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