Support for PUF in LPC55S69#787
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dgarske
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Jun 9, 2026
dgarske
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I see this enabling the wolfCrypt HW PUF options, but I don't see anywhere it actually gets used in wolfBoot? Or even called in wolfCrypt. How's this supposed to work end to end?
danielinux
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Jun 15, 2026
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This adds the useful build plumbing for LPC55 PUF support, but it does not yet connect the HW PUF to the attestation identity.
What we actually need here is the HW PUF to become the UID/UDS source for the boot attestation demo. Today the attestation stack gets its identity through hal_uds_derive_key() / hal_attestation_get_ueid() in dice.c.
This PR still needs:
- a new LPC55 attestation config enabling PSA attestation demo options
- LPC55 hal support that rebuilds identity from PUF exposing it via hal_uds_derive_key / get_ueid. Check
existing generic software managed internal flash PUF support in STM32H5existing support for HW PUF in mcxn.c via those API for how to implement - The test app showing that the PSA attestation token is actually produced from the PUF-derived identity wired inside wolfBoot.
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This adds a new example config to wolfBoot, to demonstrate and test the new lpc55s69 hw puf support added in wolfSSL/wolfssl#10584