fix(stm): Fix the implementation difference for schnorr signature between cpu and circuit #2994
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…chnorr and updated the tests
damrobi
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hjeljeli32
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Feb 11, 2026
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@damrobi
Thanks a lot for the quick turnaround on this PR 🙏
This looks really good to me and is fully aligned with the decisions we discussed yesterday.
I left a couple of small comments regarding doc comments that are now slightly outdated, but nothing blocking from my side.
Great work 👍
| @@ -63,18 +62,10 @@ impl ProjectivePoint { | |||
| /// Hashes input bytes to a projective point on the Jubjub curve | |||
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@damrobi
The doc comment on hash_to_projective_point is now outdated.
| /// and works with the Jubjub elliptic curve and the Poseidon hash function. | ||
| /// | ||
| /// Input: | ||
| /// - a message: some bytes |
| /// | ||
| /// Input: | ||
| /// - a Unique Schnorr signature | ||
| /// - a message: some bytes |
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Content
This PR includes a fix to the implementation of the unique schnorr signature that differs between cpu and circuit. This fix mainly consists in modifying the input to the
signandverifyfunctions of theunique_schnorr_signaturemodule to takeBaseFieldElements instead of arbitrary bytes. The bytes that were previously handled within the sign function will be treated outside of the signature in a later PR.Warning: This PR does not include the proper handling of the message bytes and merkle root before giving them to the signature function!
Content of the PR:
hash_to_projective_pointto haveBaseFieldElementas inputssignandverifyfunctions to take&[BaseFieldElement]instead of&[u8]BaseFieldElementto the benchesFrom<&[u8;32]>implementation toBaseFieldElementfor testing onlyPre-submit checklist
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Issue(s)
Relates to #2993