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[acc, pqc] Rebase of PQC development work into expo#197

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apinise merged 87 commits intomasterfrom
acc-pqc
Feb 22, 2026
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[acc, pqc] Rebase of PQC development work into expo#197
apinise merged 87 commits intomasterfrom
acc-pqc

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@apinise apinise commented Feb 12, 2026 •
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This PR integrates the collaborative development work from expo-otbn-pqc into upstream to support ML-KEM and ML-DSA algorithms on ACC (legacy OTBN). It includes numerous hardware/software changes to ACC and KMAC including a dedicated sideload interface from KMAC to ACC, vector ISA extension, and ML-KEM/ML-DSA performance and code-size optimizations. For implementation details it is encouraged to review commits and PR's from the development repository.

There are two additional PR made sequentially.
PR #199 Will perform a repo wide rename of OTBN to ACC as OTBN is no longer seen as strictly a Bignum Accelerator given its versatile asymmetric cryptographic capabilities and vector ISA extension.
PR #200 Updates the documentation for the renamed ACC.

"Towards ML-KEM and ML-DSA on OpenTitan" - https://eprint.iacr.org/2024/1192
"Improving ML-KEM and ML-DSA on OpenTitan - Efficient Multiplication Vector Instructions for OTBN" - https://eprint.iacr.org/2025/2028

Follow-Up

The size of this PR was > 100 commits which doesn't allow for a rebase and merge. It has been split into two different parts with #201 as the first half of the commits and this PR will merge the second half

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github-actions bot commented Feb 12, 2026 •
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Expo CLA Assistant All committers have signed the CLA.
Posted by the CLA Assistant Lite bot.

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apinise commented Feb 13, 2026

The Verible lint test is expected to fail in this PR as it exceeds the 20,000 line limit. It has been tested offline to ensure there are no more lint warnings.

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apinise commented Feb 13, 2026

I certify that I have read and agree that my contributions will be bound by the expo CLA.

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apinise commented Feb 13, 2026

recheck

@apinise apinise requested a review from qmn February 13, 2026 14:34
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jadephilipoom commented Feb 13, 2026

Awesome work, Evan! Reviewing the full diff line-by-line isn't feasible here but I did some spot-checks on various files and confirmed the differences match my expectations relative to the state of expo-otbn-pqc.

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jadephilipoom commented Feb 13, 2026

It occurs to me looking at the diff that I should probably have put the benchmarking stuff to a less top-level directory since it's specialized to otbn (maybe something like sw/otbn/bench) -- that can be a follow-up for me.

@apinise apinise marked this pull request as ready for review February 19, 2026 20:39
@apinise apinise changed the title [ACC, PQC] Rebase of PQC development work into expo [acc, pqc] Rebase of PQC development work into expo Feb 19, 2026
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LGTM! Great work. As the substance of this PR has been already reviewed by others, I'm just examining the more mechanical aspects: I've checked that all the commits have been signed off and meet expectations for formatting. I've looked at the license checker exceptions, which look fine.

My understanding is that the one CI failure is due to exceeding a limit in reviewdog for linting RTL. The pending fix to reviewdog isn't related to this PR, but Evan has already addressed whatever lint issues would have surfaced anyway. I verified good RTL hygiene by spot-checking a few SV files.

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apinise commented Feb 20, 2026

Quan is correct about the CI failure. The reviewdog fix has been tested on this PR separately to make sure the lint issues are cleaned, but the fix is out of scope for this PR.

This was referenced Feb 20, 2026
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@jadephilipoom @apinise
[mldsa] Verify matrix-vector mul performance tweak.
e3cee36 
We can use poly_pointwise instead of poly_pointwise_acc on the first element to
skip zeroing the destination and gain some performance.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Make hint usage loop in verify use loopi.
edbd470 
This saves some code size and also cleanly finishes the Keccak operation.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Add STACK_SIZE references to verify.
72026b4 
These are just to make it easier for callers to know how big of a stack the
function expects.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Restore the MOD register before finishing verify.
2f713fb 
This lets us avoid clobbering MOD (for successful runs) and instead return the
register as it was set at the start of the routine. This would be particularly
useful if running multiple verify operations sequentially.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Stream the matrix A in ML-DSA key generation.
9217ca9 
This removes the need to keep the entire matrix on the stack, which requires up
to K*L*1024B of space (so 58kB for ML-DSA-87). Performance impact is minimal,
since as with verification the key generation routine processes A only once.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Use less stack space in poly_uniform and poly_uniform_eta.
df8f0c1 
Switch to using the poly wdr2gpr buffer instead of the stack, reducing the
overall stack usage of keygen.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Stream s1 in key generation.
551a4b1 
This change drops about 2*L*1024B from the stack, which ranges from 8kB for
ML-DSA-44 to 14kB for ML-DSA-87. Performance impact is minimal, since s1 is
only processed once.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Remove some unneeded register saves in key generation.
9a6b5ba 
Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Stream s2 in key generation.
2426d41 
This drops K*1024B from the stack requirements, which ranges from 4kB for
ML-DSA-44 to 8kB for ML-DSA-87.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Stream t0 in key generation.
1220397 
This saves K*1024B on the stack, ranging from 4kB for ML-DSA-44 to 8kB for
ML-DSA-87.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Rename STACK_T1 to STACK_T and revise comments.
4e15c53 
This makes the computation a little easier to follow, since now the buffer
mostly holds t.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Add STACK_SIZE references to keygen.
6f4c9bc 
These are just to make it easier for callers to know how big of a stack the
function expects.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
jadephilipoom and others added 27 commits February 20, 2026 17:56
@jadephilipoom @apinise
[otbn] Add expected-memory support to testgen infrastructure.
7daecd1 
Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Move sign data to separate files.
d06a924 
This helps keep the parameter-specific and test-specific data separate from
things that don't change per-test, like the stack or the space for the
signature or the constants.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Make keypair and verify use external data.
2634a73 
This is a helpful stepping stone for enabling random testing.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Autogenerate keypair tests.
6f4c7dc 
Use test-generation infrastructure to create random tests for ML-DSA key
generation.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Autogenerate verify tests.
d67304f 
Use test-generation infrastructure to create random tests for ML-DSA signature
verification.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Autogenerate sign tests.
13537a4 
Use test-generation infrastructure to create random tests for ML-DSA signature
generation.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Add a benchmarking setup for ML-DSA.
1fadf3c 
Create some benchmarking scripts to collect data from test logs and compare
average/median cycle counts between versions.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Change max message lengths to 3kB.
8721a5e 
Previously, the randomly generated messages were sometimes slightly too big to
fit in DMEM for verify.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mlkem] Randomly generate ML-KEM key generation tests.
3f8d9bc 
Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mlkem] Generate ML-KEM encapsulation tests randomly.
e329f9c 
Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mlkem] Generate ML-KEM decaps tests randomly.
dba06ce 
Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@pqcfox @apinise
[crypto] Fix PQC flag for ML-KEM and ML-DSA autogen tests
ac88321 
Signed-off-by: Kat Fox <kat@zerorisc.com>
@jadephilipoom @apinise
[mldsa,mlkem] Remove now-unused test data files.
3439faa 
Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa,mlkem] Set the default number of tests to 3.
e939fe3 
Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[lint] Fix linter errors.
b047e20 
Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Fix a bug in poly_make_hint.
8ab5aa9 
Previously, the high bits were not getting properly rotated on every iteration
of the loop. This bug was introduced (by me) in commit 50c83d/61aebd6 when w1
compression was introduced. It's very rare in practice, which is why it wasn't
caught by random test runs before -- the coefficient needs to be exactly Q -
gamma2, *and* the next (incorrect) high-nonzero bit needs to not match the
coefficient's actual high-nonzero bit (in practice most of those bits are 1 so
a mismatch is less likely than chance).

For reference, the inputs that triggered the bug were (with empty ctx and
deterministic signing):
msg = 6c1ccf244058898aff1fb55d62dcf7d31c6c3dfb9a0393bd6f84bedd937bcc2e
sk =
4af81176501ee26cae8a289ca0221106e7c4f5771ae14698362abeca0be51ac9
498245ae48dada299382ab557db2b20363fe26370416a0db27fc4126e1845ef1
fdc6c374ae20dc8e5036f16ec954c775c5e6a2166ed2cecdd426800668023168
637494ec3047babef07e88ff934234a809a101afdcda4fba1a6a755511b1b9c8
3728610403203722247461477061035106876517111802684731431386044446
1366000306365655026305108248860068262886505021221846403423455074
6806226782776242055723537780078557871674576814024035505236467616
5583243703420328858475283547335600587245402847734152547066683462
5017468035803785516350548055622278401421742126848378278272440671
3234385001334337221555516020536222750264383355331171467216026781
0806848617586842012848522057550288583028832768800118188038207161
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0361863472308176516614514644673324164685161188515545483317340382
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8863224011178437017388713426370420458842505283735047080263868736
5032755072874644763050111633188032306830032286557420166233381550
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081fbbf5fde9eed647286f94490af24153933ffd7663095bda3e5241fe1cfa9f
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cdb7d845133a43a40904c2e25cf049f5c59ef777057655a4309be0859668b9aa
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ff84c140119398ebb996de33f29765ed0705ca336f172b3d3705f7fe9b004708
b49bdd13e7ebe431007388f7ce4748056517c1a2068801c654df71e654989049
f4e1d69baf1ddb93ad8616d2dc8cc949d0e293b63a5c4ba96b34b5690a74da10
e1875254015324dc610d184d596d9bd027a1a68478cbda53bb60b753cd0d7133

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Clean up comments and save a couple instructions in poly_make…
9dfb840 
…_hint.

While debugging a failed test, I adjusted the comments to make it clearer to
myself what was happening and found a tweak to the bugfix that makes it
slightly more efficient.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Add a regression test for poly_make_hint.
a72c8b3 
This test has unrealistic inputs that are designed to exercise all logical
cases in poly_make_hint equally, including the rare ones. I verified that the
test catches a recent bug found in poly_make_hint on a rare code path.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@jadephilipoom @apinise
[mldsa] Fix instruction alignment in poly_make_hint.
2209734 
Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
@apinise
[License Headers] Standardized contribution headers for ML-KEM and ML…
8804a85 
…-DSA papers

Signed-off-by: Evan Apinis <eapinis@zerorisc.com>
@apinise
[otbnsim] Fixed otbn stall cycle count after stat collect changes
d9f3376 
Changes to the otbn stat collect python file affected what stall
cycles were accumulated. When you step the simulation during a
wipe cycle the stall is no longer accumulated. Additionally fetch stalls
were already accumulated, because they were caused by the previous
instruction. These two changes reduced the number of stat collected
stalls from 4 to 2. This commit updates the test to match the behavior
up the script.

Signed-off-by: Evan Apinis <eapinis@zerorisc.com>
@apinise
[otbn, smoke] Added fusesoc core for pqc parameter to smoke test import
222f321 
Verilator otbn top sim was missing the kmac interface and fusesoc
package to import the parameter value.

Signed-off-by: Evan Apinis <eapinis@zerorisc.com>
@apinise
[mypy, otbn] Fixed mypy linting errors for otbnsim python files
cdf1787 
Signed-off-by: Evan Apinis <eapinis@zerorisc.com>
@apinise
[verible, rtl] Fixed verible lint warnings for rtl and dv
b0879e4 
Fixed lint warnings in KMAC and OTBN RTL and DV for earlgrey
and darjeeling checks. Also fixed lint warnings for verilator.

Signed-off-by: apinise <eapinis@zerorisc.com>
@apinise
[verible, rtl] Tied off unused input ports in OTBN from PQC param
23b1d6c 
Signed-off-by: Evan Apinis <eapinis@zerorisc.com>
@apinise
[integration] Resolve issues with hjson dmem endianess in crypto tests
0b55d28 
Signed-off-by: Evan Apinis <eapinis@zerorisc.com>
@apinise
[tops] Regenerate top_darjeeling and top_earlgrey
36c3ff5 
Signed-off-by: Evan Apinis <eapinis@zerorisc.com>
@apinise apinise merged commit 478837c into master Feb 22, 2026
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@qmn qmn qmn approved these changes

@jadephilipoom jadephilipoom jadephilipoom approved these changes

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@apinise @jadephilipoom @qmn @pqcfox