[roll third_party/pigweed] pw_crypto: Refactor Sha256

1. Extracts state tracking from backends to the facade, with tests
   against a mocked backend.

2. Makes Sha256::Update() chainable. e.g.
   ```
   if (!Sha256().Update(message).Update(more_message).Final().ok()) {
       // Handle errors.
   }
   ```
   All usage and documentation are updated accordingly.

3. Inlines Sha256::Sha256()/Update()/Final() in sha256.h, removes
   sha256.cc.

4. Other trivial clean ups.

Test:
  - `pw presubmit`
  - `pw presubmit --step gn_crypto_(mbedtls|boringssl|micro_ecc)_build`

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/55343

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 1829982bd541d89..6ae057c48564ac4
Roller-URL: https://ci.chromium.org/b/8838034695374247008
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8838034695374247008
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ibeda6109b793934063433dbd1393129b53b98519
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/58060
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
1 file changed
tree: b384f687a0489cb0b0b7d104f0fab52f2187ff24
  1. applications/
  2. build_overrides/
  3. pw_board_led/
  4. pw_board_led_arduino/
  5. pw_board_led_host/
  6. pw_board_led_stm32cube/
  7. pw_board_led_stm32f429i_disc1/
  8. pw_spin_delay/
  9. pw_spin_delay_arduino/
  10. pw_spin_delay_host/
  11. pw_spin_delay_stm32cube/
  12. pw_spin_delay_stm32f429i_disc1/
  13. pw_sys_io_stm32cube/
  14. targets/
  15. third_party/
  16. tools/
  17. .gitattributes
  18. .gitignore
  19. .gitmodules
  20. .gn
  21. activate.bat
  22. banner.txt
  23. bootstrap.bat
  24. bootstrap.sh
  25. BUILD.gn
  26. BUILDCONFIG.gn
  27. env_setup.json
  28. navbar.md
  29. PW_PLUGINS
  30. README.md
README.md

Pigweed Experimental

This repository contains experimental pigweed modules.

Repository setup

Clone this repo with --recursive to get all required submodules.

git clone --recursive https://pigweed.googlesource.com/pigweed/experimental

This will pull the Pigweed source repository into third_party/pigweed. If you already cloned but forgot to --recursive run git submodule update --init to pull all submodules.