Add ROMode for configurable Poseidon sponge width#490
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srinathsetty merged 4 commits intomainfrom Apr 2, 2026
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Add ROMode enum (Wide/Narrow) to ROTrait and ROCircuitTrait with new_with_mode() constructors. Wide (U24) is the default; Narrow (U5) uses fewer constraints per squeeze for lightweight transcripts. PoseidonConstantsCircuit now holds constants for both widths. PoseidonRO and PoseidonROCircuit dispatch based on mode at squeeze time. Also add set_compact() on ROCircuitTrait for backends that support trading constraints for fewer non-zeros.
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Is this fully backwards compatible? Seems like it changes the serialization of PoseidonConstantsCircuit which seems to be part of |
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Good point! Fixed PR description. |
iontzialla
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Apr 2, 2026
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Add an
ROModeenum (Wide/Narrow) toROTraitandROCircuitTraitwithnew_with_mode()constructors, enabling callers to select a reduced-width Poseidon sponge without introducing new type parameters.Exisiting code
ROModedefaults toWide,new()is unchanged, andPoseidonConstantsCircuit/PoseidonRO/PoseidonROCircuitretain their existing type signatures. Callers opt in to narrow mode vianew_with_mode(constants, ROMode::Narrow).