WASM emulator demo support#3869
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Adds KeyVault::snapshot() and KeyVaultSnapshot struct exposing key data, PCRs, and control register state for external inspection. ModelEmulated::key_vault_snapshot() forwards the call so WASM consumers can display the keyvault contents in real time.
self.keys is a ReadWriteMemory<2048> (KEY_REG_SIZE = 0x800) but only 24 keys × 64 bytes = 1536 bytes are valid. Slicing the source down to the valid portion avoids the copy_from_slice length mismatch panic.
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Summary
This PR collects the
caliptra-swchanges needed to run Caliptra in abrowser via WebAssembly. They back the standalone WASM emulator demo at
https://swenson.github.io/caliptra-wasm/ (source:
https://github.com/swenson/caliptra-wasm).
What's here
The substantive emulator/model changes that the WASM build depends on:
sw-emulator/.../key_vault.rs– Add aKeyVaultsnapshot accessor sothe demo UI can display key-vault state, and fix a
snapshotpanic(keys storage is padded to 2048 bytes).
hw-model/– Expose the snapshot accessor throughModelEmulated/ the
HwModeltrait, plus the dependency wiring needed to build forwasm32-unknown-unknown.for the demo flow.
Plus an early embedded prototype of the demo itself under
wasm-demo/. Thatprototype has since graduated into the standalone
caliptra-wasmrepository; it isincluded here only for historical context and is not intended to live in
caliptra-swlong-term.Commits
Why open it now
Folks have asked to see the current state of the WASM-enabling changes. This
draft makes them reviewable in one place even though the branch needs a
rebase onto current
mainbefore it could merge.