Switch Groth16 SNARK circuit from SHA-256 to Poseidon hash#31
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Replace the SHA-256 gadget (~150K R1CS constraints) with Poseidon sponge (~480 constraints) for the in-circuit key hash and MAC computation. This yields ~300x fewer constraints and significantly faster prove times (~3s vs ~30s in debug). - Add src/poseidon.rs: BN254 Poseidon config (t=3, rate=2, alpha=5), native hash, bytes<->field element conversion - Rewrite src/snark.rs: PoseidonKeyProofCircuit with 3 native field element public inputs (key_hash, payload_hash, mac) instead of 768 Boolean vars; private witness is 1 field element (key) - Rename Groth16Sha256 -> Groth16Poseidon across all modules - Update CLAUDE.md documentation All 132 tests pass. Clippy clean. No wire format changes (algorithm 4 byte value unchanged). https://claude.ai/code/session_01LJyL1uYXD1JHMq8Q3v7shM
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Replace the SHA-256 gadget (~150K R1CS constraints) with Poseidon sponge (~480 constraints) for the in-circuit key hash and MAC computation. This yields ~300x fewer constraints and significantly faster prove times (~3s vs ~30s in debug).
All 132 tests pass. Clippy clean. No wire format changes (algorithm 4 byte value unchanged).
https://claude.ai/code/session_01LJyL1uYXD1JHMq8Q3v7shM