internal/chacha20: improve chacha20 performance on ppc64le

This improves the performance of the asm implementation for
chacha20 on ppc64le by updating to the vsx implementation
provided in cryptogams. The previous implementation was found to
not perform as well as possible on power9. This implementation
improves performance on both power8 and power9.

Power9 improvement with this change as compared to current:

name               old time/op    new time/op     delta
ChaCha20/32-64        361ns ± 0%      225ns ± 0%  -37.67%  (p=1.000 n=1+1)
ChaCha20/63-64        364ns ± 0%      229ns ± 0%  -37.09%  (p=1.000 n=1+1)
ChaCha20/64-64        364ns ± 0%      231ns ± 0%  -36.54%  (p=1.000 n=1+1)
ChaCha20/256-64       332ns ± 0%      199ns ± 0%  -40.06%  (p=1.000 n=1+1)
ChaCha20/1024-64     1.24µs ± 0%     0.70µs ± 0%  -43.23%  (p=1.000 n=1+1)
ChaCha20/1350-64     1.89µs ± 0%     1.03µs ± 0%  -45.35%  (p=1.000 n=1+1)
ChaCha20/65536-64    77.0µs ± 0%     42.5µs ± 0%  -44.83%  (p=1.000 n=1+1)

This is discussed in issue golang/go#25051.

A few asm instructions vmrgew and vmrgow were just added in Go 1.14
so have been encoded using WORD at this point.

Change-Id: I2b192a63cf46b0b20195e60e4412c43c5dd14ad8
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/195959
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
3 files changed
tree: c15b578a13f05f35ad3c0367e836d30dfafaae7a
  1. .gitattributes
  2. .gitignore
  3. AUTHORS
  4. CONTRIBUTING.md
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. README.md
  9. acme/
  10. argon2/
  11. bcrypt/
  12. blake2b/
  13. blake2s/
  14. blowfish/
  15. bn256/
  16. cast5/
  17. chacha20poly1305/
  18. codereview.cfg
  19. cryptobyte/
  20. curve25519/
  21. ed25519/
  22. go.mod
  23. go.sum
  24. hkdf/
  25. internal/
  26. md4/
  27. nacl/
  28. ocsp/
  29. openpgp/
  30. otr/
  31. pbkdf2/
  32. pkcs12/
  33. poly1305/
  34. ripemd160/
  35. salsa20/
  36. scrypt/
  37. sha3/
  38. ssh/
  39. tea/
  40. twofish/
  41. xtea/
  42. xts/
README.md

Go Cryptography

This repository holds supplementary Go cryptography libraries.

Download/Install

The easiest way to install is to run go get -u golang.org/x/crypto/.... You can also manually git clone the repository to $GOPATH/src/golang.org/x/crypto.

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see https://golang.org/doc/contribute.html.

The main issue tracker for the crypto repository is located at https://github.com/golang/go/issues. Prefix your issue with “x/crypto:” in the subject line, so it is easy to find.

Note that contributions to the cryptography package receive additional scrutiny due to their sensitive nature. Patches may take longer than normal to receive feedback.