[feat] Add Stable Owner Key derivation from HEK seed#3625
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ROM derives a Stable Owner Root Key from HEK seed via HKDF into KV15 during cold boot. CM_DERIVE_STABLE_KEY gains OwnerKey (0x3) which uses CMAC-KDF + HMAC-KDF with label "Stable Owner Key" to produce child keys as encrypted CMKs. Both ROM firmware processor and runtime handle the new key type with identical derivation logic. Adds integration tests for all three key types (IDevId, LDevId, OwnerKey) and a separate test verifying different personalization seeds produce different keys.
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Implements chipsalliance/Caliptra#657 |
swenson
previously approved these changes
Apr 16, 2026
clundin25
reviewed
Apr 17, 2026
clundin25
reviewed
Apr 17, 2026
clundin25
reviewed
Apr 17, 2026
mhatrevi
requested review from
JohnTraverAmd,
ajisaxena,
bluegate010,
fdamato,
jhand2,
korran,
rusty1968,
timothytrippel,
vsonims and
zhalvorsen
as code owners
bluegate010
reviewed
Apr 20, 2026
clundin25
reviewed
Apr 21, 2026
mlvisaya
reviewed
Apr 29, 2026
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ROM derives a Stable Owner Root Key from HEK seed via HKDF into KV15 during cold boot. CM_DERIVE_STABLE_KEY gains OwnerKey (0x3) which uses CMAC-KDF + HMAC-KDF with label "Stable Owner Key" to produce child keys as encrypted CMKs.
Both ROM firmware processor and runtime handle the new key type with identical derivation logic. Adds integration tests for all three key types (IDevId, LDevId, OwnerKey) and a separate test verifying different personalization seeds produce different keys.