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. acme/
  2. argon2/
  3. bcrypt/
  4. blake2b/
  5. blake2s/
  6. blowfish/
  7. bn256/
  8. cast5/
  9. chacha20poly1305/
  10. cryptobyte/
  11. curve25519/
  12. ed25519/
  13. hkdf/
  14. internal/
  15. md4/
  16. nacl/
  17. ocsp/
  18. openpgp/
  19. otr/
  20. pbkdf2/
  21. pkcs12/
  22. poly1305/
  23. ripemd160/
  24. salsa20/
  25. scrypt/
  26. sha3/
  27. ssh/
  28. tea/
  29. twofish/
  30. xtea/
  31. xts/
  32. .gitattributes
  33. .gitignore
  34. AUTHORS
  35. codereview.cfg
  36. CONTRIBUTING.md
  37. CONTRIBUTORS
  38. go.mod
  39. go.sum
  40. LICENSE
  41. PATENTS
  42. README.md
README.md

Go Cryptography

This repository holds supplementary Go cryptography libraries.

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