refactor: clean up witness package, introduces clean witness.Witness interface
#450
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…uple schema.Schema
ivokub
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Jan 31, 2023
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ivokub
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Looks all good. A few minor comments but otherwise good to go. I think this change makes a lot of sense and makes the whole binary representation of witness so much more clear and practical to use.
I don't understand why the tests are failing though. May it due to double filling in FromJSON?
internal/generator/backend/template/zkpschemes/plonk/plonk.prove.go.tmpl
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internal/generator/backend/template/zkpschemes/plonk/plonk.verify.go.tmpl
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internal/generator/backend/template/zkpschemes/plonkfri/plonk.prove.go.tmpl
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internal/generator/backend/template/zkpschemes/plonkfri/plonk.verify.go.tmpl
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internal/generator/backend/template/zkpschemes/groth16/groth16.prove.go.tmpl
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internal/generator/backend/template/zkpschemes/groth16/groth16.verify.go.tmpl
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Motivation for this PR
#445 and #442 . + decouple *schema.Schema from witness data structure; we only need a
schema.Schemawhen doingJSON(un)marshaling, which happens for pretty printing or in the playground. This had a significant cost in cpu + in storage, and in 99% of cases we didn't use it.See
witness.ExampleWitnessfor usage andwitness.Witnessinterface for the gist of the PR.Additionally,
groth16plonkandconstraintpackages now directly reason with[]fr.Element(as they should).Breaking changes;
[uint32(nbPublic)|uint32(nbSecret)|uint32(nbElements)|elements...]instead of[uint32(nbElements)|elements...].fr.Vectormanage its serialization (in gnark-crypto), but a witness needs these 2 extra uint32 to ensure consistency when serializing / deserializing.