internal/chacha20: improve performance for ppc64le

Add asm implementation for chacha20 using vector instructions on ppc64le.
Below, the difference using the new code:

name               old speed     new speed      delta
ChaCha20/32-16     167MB/s ± 0%   129MB/s ± 0%   -22.60%  (p=0.008 n=5+5)
ChaCha20/63-16     308MB/s ± 0%   249MB/s ± 0%   -19.00%  (p=0.008 n=5+5)
ChaCha20/64-16     357MB/s ± 0%   251MB/s ± 0%   -29.57%  (p=0.008 n=5+5)
ChaCha20/256-16    398MB/s ± 0%  1199MB/s ± 0%  +201.20%  (p=0.008 n=5+5)
ChaCha20/1024-16   413MB/s ± 0%  1398MB/s ± 0%  +238.67%  (p=0.008 n=5+5)
ChaCha20/1350-16   395MB/s ± 0%  1189MB/s ± 0%  +200.71%  (p=0.008 n=5+5)
ChaCha20/65536-16  420MB/s ± 0%  1489MB/s ± 0%  +254.10%  (p=0.008 n=5+5)

Small sizes are slower due the fact that it always calculates using
256 bytes of key stream.

This change was originally from Paulo Flabiano Smorigo <pfsmorigo@linux.vnet.ibm.com>
and started as CL 108999 (https://go-review.googlesource.com/c/crypto/+/108999).

Fixes golang/go#25051

Change-Id: Ie510494249b227379e23d993467256b3d4088035
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/172177
Run-TryBot: Carlos Eduardo Seo <cseo@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
3 files changed
tree: 187ba0d06307d9e5ac95e9453f2640ed6e3e2740
  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.