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| 1 | +//! The dummy circuit used for generating the proof of no provable indexing data |
| 2 | +
|
| 3 | +use super::{ |
| 4 | + api::{FinalExtractionBuilderParams, NUM_IO}, |
| 5 | + PublicInputs, DUMMY_METADATA_DIGEST_PREFIX, |
| 6 | +}; |
| 7 | +use alloy::primitives::U256; |
| 8 | +use anyhow::Result; |
| 9 | +use derive_more::derive::Constructor; |
| 10 | +use itertools::Itertools; |
| 11 | +use mp2_common::{ |
| 12 | + digest::Digest, |
| 13 | + group_hashing::CircuitBuilderGroupHashing, |
| 14 | + keccak::PACKED_HASH_LEN, |
| 15 | + public_inputs::PublicInputCommon, |
| 16 | + serialization::{deserialize, serialize}, |
| 17 | + types::CBuilder, |
| 18 | + u256::{CircuitBuilderU256, UInt256Target, WitnessWriteU256}, |
| 19 | + utils::{ToFields, ToTargets}, |
| 20 | + D, F, |
| 21 | +}; |
| 22 | +use plonky2::{ |
| 23 | + iop::{ |
| 24 | + target::{BoolTarget, Target}, |
| 25 | + witness::{PartialWitness, WitnessWrite}, |
| 26 | + }, |
| 27 | + plonk::proof::ProofWithPublicInputsTarget, |
| 28 | +}; |
| 29 | +use plonky2_ecgfp5::gadgets::curve::{CircuitBuilderEcGFp5, CurveTarget, PartialWitnessCurve}; |
| 30 | +use recursion_framework::circuit_builder::CircuitLogicWires; |
| 31 | +use serde::{Deserialize, Serialize}; |
| 32 | +use std::array; |
| 33 | + |
| 34 | +#[derive(Clone, Debug, Constructor)] |
| 35 | +pub struct DummyCircuit { |
| 36 | + /// Merge flag |
| 37 | + is_merge: bool, |
| 38 | + /// Block number |
| 39 | + block_number: U256, |
| 40 | + /// Packed block hash |
| 41 | + block_hash: [F; PACKED_HASH_LEN], |
| 42 | + /// Packed block hash of the previous block |
| 43 | + prev_block_hash: [F; PACKED_HASH_LEN], |
| 44 | + /// Metadata digest for the rows extracted |
| 45 | + /// This value can be computed outside of the circuit depending on the data source, |
| 46 | + /// the circuits don’t care how it is computed given that we are not proving the |
| 47 | + /// provenance of the data. |
| 48 | + metadata_digest: Digest, |
| 49 | + /// Row values digest of all the rows extracted |
| 50 | + /// This must corresponds to the value digest that will be re-computed when |
| 51 | + /// constructing the rows tree for the current block. |
| 52 | + row_digest: Digest, |
| 53 | +} |
| 54 | + |
| 55 | +#[derive(Clone, Debug, Serialize, Deserialize)] |
| 56 | +pub struct DummyWires { |
| 57 | + #[serde(serialize_with = "serialize", deserialize_with = "deserialize")] |
| 58 | + is_merge: BoolTarget, |
| 59 | + block_number: UInt256Target, |
| 60 | + block_hash: [Target; PACKED_HASH_LEN], |
| 61 | + prev_block_hash: [Target; PACKED_HASH_LEN], |
| 62 | + #[serde(serialize_with = "serialize", deserialize_with = "deserialize")] |
| 63 | + metadata_digest: CurveTarget, |
| 64 | + #[serde(serialize_with = "serialize", deserialize_with = "deserialize")] |
| 65 | + row_digest: CurveTarget, |
| 66 | +} |
| 67 | + |
| 68 | +impl DummyCircuit { |
| 69 | + fn build(b: &mut CBuilder) -> DummyWires { |
| 70 | + let is_merge = b.add_virtual_bool_target_unsafe(); |
| 71 | + let block_number = b.add_virtual_u256_unsafe(); |
| 72 | + let [block_hash, prev_block_hash] = array::from_fn(|_| b.add_virtual_target_arr()); |
| 73 | + let [metadata_digest, row_digest] = array::from_fn(|_| b.add_virtual_curve_target()); |
| 74 | + |
| 75 | + // Add the prefix to the metadata digest to ensure the metadata digest |
| 76 | + // will keep track of whether we use this dummy circuit or not. |
| 77 | + let prefix = b.constants(&DUMMY_METADATA_DIGEST_PREFIX.to_fields()); |
| 78 | + let inputs = prefix |
| 79 | + .into_iter() |
| 80 | + .chain(metadata_digest.to_targets()) |
| 81 | + .collect_vec(); |
| 82 | + let encoded_metadata_digest = b.map_to_curve_point(&inputs); |
| 83 | + |
| 84 | + PublicInputs::new( |
| 85 | + &block_hash, |
| 86 | + &prev_block_hash, |
| 87 | + &row_digest.to_targets(), |
| 88 | + &encoded_metadata_digest.to_targets(), |
| 89 | + &block_number.to_targets(), |
| 90 | + &[is_merge.target], |
| 91 | + ) |
| 92 | + .register_args(b); |
| 93 | + |
| 94 | + DummyWires { |
| 95 | + is_merge, |
| 96 | + block_number, |
| 97 | + block_hash, |
| 98 | + prev_block_hash, |
| 99 | + metadata_digest, |
| 100 | + row_digest, |
| 101 | + } |
| 102 | + } |
| 103 | + |
| 104 | + fn assign(&self, pw: &mut PartialWitness<F>, wires: &DummyWires) { |
| 105 | + pw.set_bool_target(wires.is_merge, self.is_merge); |
| 106 | + pw.set_u256_target(&wires.block_number, self.block_number); |
| 107 | + [ |
| 108 | + (wires.block_hash, self.block_hash), |
| 109 | + (wires.prev_block_hash, self.prev_block_hash), |
| 110 | + ] |
| 111 | + .iter() |
| 112 | + .for_each(|(t, v)| { |
| 113 | + pw.set_target_arr(t, v); |
| 114 | + }); |
| 115 | + [ |
| 116 | + (wires.metadata_digest, self.metadata_digest), |
| 117 | + (wires.row_digest, self.row_digest), |
| 118 | + ] |
| 119 | + .iter() |
| 120 | + .for_each(|(t, v)| { |
| 121 | + pw.set_curve_target(*t, v.to_weierstrass()); |
| 122 | + }); |
| 123 | + } |
| 124 | +} |
| 125 | + |
| 126 | +impl CircuitLogicWires<F, D, 0> for DummyWires { |
| 127 | + type CircuitBuilderParams = FinalExtractionBuilderParams; |
| 128 | + type Inputs = DummyCircuit; |
| 129 | + |
| 130 | + const NUM_PUBLIC_INPUTS: usize = NUM_IO; |
| 131 | + |
| 132 | + fn circuit_logic( |
| 133 | + builder: &mut CBuilder, |
| 134 | + _verified_proofs: [&ProofWithPublicInputsTarget<D>; 0], |
| 135 | + _builder_parameters: Self::CircuitBuilderParams, |
| 136 | + ) -> Self { |
| 137 | + DummyCircuit::build(builder) |
| 138 | + } |
| 139 | + |
| 140 | + fn assign_input(&self, inputs: Self::Inputs, pw: &mut PartialWitness<F>) -> Result<()> { |
| 141 | + inputs.assign(pw, self); |
| 142 | + Ok(()) |
| 143 | + } |
| 144 | +} |
| 145 | + |
| 146 | +#[cfg(test)] |
| 147 | +mod test { |
| 148 | + use super::*; |
| 149 | + use mp2_common::{group_hashing::map_to_curve_point, C}; |
| 150 | + use mp2_test::circuit::{run_circuit, UserCircuit}; |
| 151 | + use plonky2::field::types::Sample; |
| 152 | + use rand::{thread_rng, Rng}; |
| 153 | + |
| 154 | + impl UserCircuit<F, D> for DummyCircuit { |
| 155 | + type Wires = DummyWires; |
| 156 | + |
| 157 | + fn build(cb: &mut CBuilder) -> Self::Wires { |
| 158 | + DummyCircuit::build(cb) |
| 159 | + } |
| 160 | + |
| 161 | + fn prove(&self, pw: &mut PartialWitness<F>, wires: &Self::Wires) { |
| 162 | + self.assign(pw, wires); |
| 163 | + } |
| 164 | + } |
| 165 | + |
| 166 | + #[test] |
| 167 | + fn test_final_extraction_dummy_circuit() { |
| 168 | + let rng = &mut thread_rng(); |
| 169 | + |
| 170 | + let is_merge = rng.gen(); |
| 171 | + let block_number = U256::from(rng.gen::<u64>()); |
| 172 | + let [block_hash, prev_block_hash] = array::from_fn(|_| F::rand_array()); |
| 173 | + let [metadata_digest, row_digest] = array::from_fn(|_| Digest::sample(rng)); |
| 174 | + |
| 175 | + let test_circuit = DummyCircuit::new( |
| 176 | + is_merge, |
| 177 | + block_number, |
| 178 | + block_hash, |
| 179 | + prev_block_hash, |
| 180 | + metadata_digest, |
| 181 | + row_digest, |
| 182 | + ); |
| 183 | + |
| 184 | + let proof = run_circuit::<F, D, C, _>(test_circuit); |
| 185 | + let pi = PublicInputs::from_slice(&proof.public_inputs); |
| 186 | + |
| 187 | + // Check the public inputs. |
| 188 | + assert_eq!(pi.is_merge_case(), is_merge); |
| 189 | + assert_eq!(U256::from(pi.block_number()), block_number); |
| 190 | + assert_eq!(pi.block_hash_raw(), block_hash); |
| 191 | + assert_eq!(pi.prev_block_hash_raw(), prev_block_hash); |
| 192 | + assert_eq!(pi.value_point(), row_digest.to_weierstrass()); |
| 193 | + { |
| 194 | + let prefix = DUMMY_METADATA_DIGEST_PREFIX.to_fields(); |
| 195 | + let inputs = prefix |
| 196 | + .into_iter() |
| 197 | + .chain(metadata_digest.to_fields()) |
| 198 | + .collect_vec(); |
| 199 | + let expected_metadata_digest = map_to_curve_point(&inputs); |
| 200 | + assert_eq!( |
| 201 | + pi.metadata_point(), |
| 202 | + expected_metadata_digest.to_weierstrass() |
| 203 | + ); |
| 204 | + } |
| 205 | + } |
| 206 | +} |
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