Authdecode (continued) #669
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* update to work with PSE halo2 0.3.0 - simpify protocol - rebase on dev - add mock backend - fix failing tests - use dedicated field element for salt * add params from Axiom's setup * add a constraint on 3 MSBs * protocol refactor * halo2 backend refactor. one test is failing. * don't use `slice_to_columns` since it is bugged. all tests pass now. * fix an incorrect constraint for unused advice cells * use F::zero() instead of F::from(0) * restore the use of `slice_to_columns` * change plaintext type to u8 vec * remove encoding verification * make the protocol accept uncorrelated encodings * use itybity for bit ops * pack plaintext with byte granularity This will make handling of commitments easier for the user since there will be no need to perform bit manipulations. * use opaque_debug with generics * measure commitment chunk size in bytes, not bits * cleanups * split into core and io crates * docs and cleanups * move to crates root dir * add changes in preparation to integration * use `poseidon-gadget`s permute; change to lbs0;
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I added commits in 479 which still need to be reviewed here: Re commit: use poseidon-gadgets permute; change to lbs0;
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NOT YET READY FOR REVIEW.
(This PR is a continuation of #479. 479 was squash-merged to avoid rebase conflicts I've been getting).
This PR implements the AuthDecode protocol to be used to create zk-friendly commitments.
Temporarily, it uses a zk circuit which reveals to the Verifier the ranges being committed to. In the future, we will modify the circuit to hide the ranges.