server: add dma memcpy callback and add guard for CMAC DMA and KEY DMA

[rizlik]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for custom DMA memory copy callbacks and introduces configuration guards to selectively disable CMAC DMA and key DMA functionality. This provides more flexibility in DMA operations while allowing systems to exclude specific DMA features when not needed.

• Adds custom DMA memory copy callback infrastructure with new configuration option WOLFHSM_CFG_DMA_CUSTOM_CLIENT_COPY
• Introduces guards WOLFHSM_CFG_NO_CMAC_DMA and WOLFHSM_CFG_NO_KEY_DMA to disable specific DMA operations
• Updates DMA copy functions to use custom callbacks when available, falling back to memcpy when not configured

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
wolfhsm/wh_settings.h	Adds documentation for the three new configuration options
wolfhsm/wh_server.h	Defines new callback types, updates context structures, and adds registration function declaration
test/wh_test_crypto.c	Adds guard to conditionally compile key DMA tests
src/wh_server_dma.c	Implements custom callback registration and integrates callbacks into copy operations
src/wh_server_crypto.c	Adds guard around CMAC DMA handling
src/wh_client_cryptocb.c	Adds guard around CMAC DMA client-side handling

[bigbrett]

A few nits and some edits for clarity. I also bring up a global architecture question for discussion.

[rizlik]

A few nits and some edits for clarity. I also bring up a global architecture question for discussion.

Thanks for the review, fixed nits and reverted unneeded macros, let me know if you want me to do some git history cleaning before going forward.

[billphipps]

I have a few naming nits that I'll bring in a future PR and I'll tag with Brett about making this the default and removing the CFG value. Looks good!

Let's work a few of the other questions after the PIC32CZ changes are merged and tested as that exercises this interface.