pics: Update the photo of the SHA1 engine

Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>
1 file changed
tree: 58c5c34a618031c46ccedfa11854dfc1d832904c
  1. .github/
  2. def/
  3. docs/
  4. gds/
  5. lef/
  6. mag/
  7. maglef/
  8. openlane/
  9. pics/
  10. signoff/
  11. spi/
  12. verilog/
  13. .gitignore
  14. .gitmodules
  15. info.yaml
  16. LICENSE
  17. Makefile
  18. README.md
README.md

Caravel User Project

License UPRJ_CI Caravel Build

SHA-1 engine

See a https://github.com/konradwilk/sha1 for the full git history of this code. Branch name is submission-mpw-two.

This is an implementation of [https://www.rfc-editor.org/rfc/inline-errata/rfc3174.html](RFC 3174) of SHA-1 engine.

It is not the most secure one nowadays (it is still used for git commit ids and TPM PCR values), but it looked like the easiest of the SHA engines to implement. The communication channel is via WishBone commands to provide sixteen words after which the engine starts and computes the digest in about 160 cycles. Then digest can be retrieved via the wishbone. There is a IRQ line so when it has completed it will bring it high if that is enabled.

SHA1

If you want to see this more interactively, I would recommend you clone https://github.com/konradwilk/sha1 and run

make test_wb_logic

which will use the various WishBone commands to program it.