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Populate LDevID CDI in the fake ROM boot flow. #1822

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Populate LDevID CDI in the fake ROM boot flow. #1822

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c9f3afe
Populate LDevID CDI in the fake ROM boot flow.
bluegate010 Nov 26, 2024
9d9e0f1
Merge branch 'main-2.x' into fake-ldevid-cdi
bluegate010 Dec 3, 2024
0f35017
Merge branch 'main-2.x' into fake-ldevid-cdi
bluegate010 Dec 4, 2024
79c8dbc
Merge branch 'main-2.x' into fake-ldevid-cdi
bluegate010 Dec 4, 2024
d9c70e7
Merge branch 'main-2.x' into fake-ldevid-cdi
bluegate010 Dec 4, 2024
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14 changes: 14 additions & 0 deletions rom/dev/src/flow/fake.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ use crate::print::HexBytes;
use crate::rom_env::RomEnv;
use caliptra_common::RomBootStatus::*;
use caliptra_common::{
keyids::KEY_ID_ROM_FMC_CDI,
memory_layout::{FMCALIAS_TBS_ORG, FMCALIAS_TBS_SIZE, LDEVID_TBS_ORG, LDEVID_TBS_SIZE},
FirmwareHandoffTable,
};
Expand Down Expand Up @@ -154,6 +155,8 @@ impl FakeRomFlow {
// SKIP Execute IDEVID layer
// LDEVID cert
copy_canned_ldev_cert(env)?;
// LDEVID cdi
initialize_fake_ldevid_cdi(env)?;

// Unlock the SHA Acc by creating a SHA Acc operation and dropping it.
// In real ROM, this is done as part of executing the SHA-ACC KAT.
Expand Down Expand Up @@ -187,6 +190,17 @@ impl FakeRomFlow {
}
}

// Used to derive the firmware's hash chain.
fn initialize_fake_ldevid_cdi(env: &mut RomEnv) -> CaliptraResult<()> {
env.hmac.hmac(
&HmacKey::Array4x12(&Array4x12::default()),
&HmacData::Slice(b""),
&mut env.trng,
KeyWriteArgs::new(KEY_ID_ROM_FMC_CDI, KeyUsage::default().set_hmac_key_en()).into(),
HmacMode::Hmac384,
)
}

pub fn copy_canned_ldev_cert(env: &mut RomEnv) -> CaliptraResult<()> {
// Store signature
env.data_vault.set_ldev_dice_signature(&FAKE_LDEV_SIG);
Expand Down