Feat/hybrid ahe voting#22
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Implements the full hybrid MACI + Additively Homomorphic ElGamal (AHE) on-chain voting flow, solving the B-line problem by ensuring the coordinator never sees individual vote contents. Key changes: Circuits (new): - Add hybrid/ Circom circuits: BallotValidity, ProcessHybridMessages, RevealVerify (client + onchain wrapper variants each) - BallotValidity proves voter eligibility and binds routing/AHE commitment without revealing stateIdx to the chain - ProcessHybridMessages implements reverse-order batch processing with an independent quinary nonce tree for cross-batch last-write-wins (LWW) - RevealVerify proves threshold partial decryption via DLEQ Contract (amaci): - Add hybrid message publishing: PublishHybridMessage validates ballot proof, curve points, and coordinator binding; stores routing + AHE ciphertexts - Add ProcessHybridBatch: reverse batch selection (chain-tail first), 11-field SHA256 inputHash including currentNonceRoot/newNonceRoot, auto-transition to Tallying when all messages processed - Add RevealHybridTally: threshold DLEQ proof verification, saves tally, transitions period to Ended - Add SetHybridKc / ConfirmHybridKc (threshold committee path) - Add HYBRID_NONCE_STATE_ROOT persistent nonce tree state - Guard StopProcessingPeriod / StopTallyingPeriod against hybrid messages - Validate vote_option_map.len() == HYBRID_M at instantiate - Add 24 multitest e2e tests covering full flow, multi-batch chaining, partial batches, all error paths, and cross-message ballot proof rejection - Remove dead HybridBatchFull error variant SDK: - Add AHE crypto primitives (ahe.ts): ElGamal encrypt/decrypt, addAhe, recoverAhe, solveDLog, DLEQ proof generation - Add buildHybridVotePayload (voter.ts): constructs routing envelope + AHE ciphertext + ballot validity proof - Add decodeHybridRouting / processHybridBatch (operator.ts): coordinator routing decryption and batch processing with nonce-tree LWW simulation - Add genHybridOnchainProcessProof (operator.ts): two-phase Groth16 proof generation for on-chain batch verification
Co-authored-by: Cursor <cursoragent@cursor.com>
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