| # Caravel User Project |
| |
| [](https://opensource.org/licenses/Apache-2.0) [](https://github.com/efabless/caravel_project_example/actions/workflows/user_project_ci.yml) [](https://github.com/efabless/caravel_project_example/actions/workflows/caravel_build.yml) |
| |
| |
| # SHA-1 engine |
| |
| See a [https://github.com/konradwilk/sha1](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. |
| |
|  |
| |
| If you want to see this more interactively, I would recommend you clone |
| [https://github.com/konradwilk/sha1](https://github.com/konradwilk/sha1) and run |
| |
| ``` |
| make test_wb_logic |
| ``` |
| |
| which will use the various WishBone commands to program it. |
| |
| ### Documentation |
| |
| To create the GDS files, there are macros that are being ingested. The best way to do is by |
| checking out the SHA-1 engine: |
| |
| ``` |
| git clone https://github.com/konradwilk/sha1 |
| ``` |
| |
| And then there are some pre-requisities: |
| |
| - You need to have OpenLANE installed. The Makefile assumes that is all setup. |
| Specifically that the docker container is installed. |
| - And make sure to have TARGET_PATH set to this directory (caravel_user_project). |
| - You have the `open_mpw_checker` installed as well (and the docker container). |
| |
| From within the `sha1` directory execute: |
| |
| ``` |
| make gds |
| ``` |
| |
| which will generate the GDS, LEF, etc files. Copy them in the `gds` sub-directory. |
| After that, you need to copy them to `caravel_user_project`. To do that: |
| |
| ``` |
| make caravel |
| ``` |
| |
| which will copy the appropiate files, run the OpenLANE to jam the macros together, and |
| run the checkers. |
