2021-06-21 05:38:43 -07:00
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//! The Orchard Action circuit implementation.
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2021-06-22 08:06:49 -07:00
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use std::mem;
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2021-06-06 21:26:02 -07:00
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use group::Curve;
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2021-04-14 21:35:48 -07:00
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use halo2::{
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circuit::{Layouter, SimpleFloorPlanner},
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plonk::{self, Advice, Column, Instance as InstanceColumn, Selector},
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2021-07-15 04:52:15 -07:00
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poly::Rotation,
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2021-04-14 21:35:48 -07:00
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transcript::{Blake2bRead, Blake2bWrite},
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};
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use pasta_curves::{arithmetic::FieldExt, pallas, vesta};
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use crate::{
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constants::MERKLE_DEPTH_ORCHARD,
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keys::{
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CommitIvkRandomness, DiversifiedTransmissionKey, NullifierDerivingKey, SpendValidatingKey,
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},
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note::{
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commitment::{NoteCommitTrapdoor, NoteCommitment},
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nullifier::Nullifier,
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ExtractedNoteCommitment,
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},
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2021-06-06 04:26:37 -07:00
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primitives::{
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poseidon,
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redpallas::{SpendAuth, VerificationKey},
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},
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spec::NonIdentityPallasPoint,
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tree::Anchor,
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value::{NoteValue, ValueCommitTrapdoor, ValueCommitment},
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};
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use gadget::{
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ecc::{
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chip::{EccChip, EccConfig},
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Point,
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},
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poseidon::{Pow5T3Chip as PoseidonChip, Pow5T3Config as PoseidonConfig},
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sinsemilla::{
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chip::{SinsemillaChip, SinsemillaConfig},
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merkle::chip::{MerkleChip, MerkleConfig},
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},
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utilities::{
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enable_flag::{EnableFlagChip, EnableFlagConfig},
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plonk::{PLONKChip, PLONKConfig},
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CellValue, UtilitiesInstructions,
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},
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};
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use std::convert::TryInto;
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2021-02-25 10:11:46 -08:00
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pub(crate) mod gadget;
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2021-04-14 21:35:48 -07:00
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/// Size of the Orchard circuit.
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const K: u32 = 11;
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/// Configuration needed to use the Orchard Action circuit.
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#[derive(Clone, Debug)]
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pub struct Config {
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q_primary: Selector,
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primary: Column<InstanceColumn>,
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advices: [Column<Advice>; 10],
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enable_flag_config: EnableFlagConfig,
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ecc_config: EccConfig,
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poseidon_config: PoseidonConfig<pallas::Base>,
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plonk_config: PLONKConfig,
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merkle_config_1: MerkleConfig,
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merkle_config_2: MerkleConfig,
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sinsemilla_config_1: SinsemillaConfig,
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sinsemilla_config_2: SinsemillaConfig,
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}
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/// The Orchard Action circuit.
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#[derive(Debug, Default)]
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pub struct Circuit {
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pub(crate) path: Option<[pallas::Base; MERKLE_DEPTH_ORCHARD]>,
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pub(crate) pos: Option<u32>,
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pub(crate) g_d_old: Option<NonIdentityPallasPoint>,
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pub(crate) pk_d_old: Option<DiversifiedTransmissionKey>,
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pub(crate) v_old: Option<NoteValue>,
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pub(crate) rho_old: Option<Nullifier>,
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pub(crate) psi_old: Option<pallas::Base>,
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pub(crate) rcm_old: Option<NoteCommitTrapdoor>,
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pub(crate) cm_old: Option<NoteCommitment>,
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pub(crate) alpha: Option<pallas::Scalar>,
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pub(crate) ak: Option<SpendValidatingKey>,
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pub(crate) nk: Option<NullifierDerivingKey>,
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pub(crate) rivk: Option<CommitIvkRandomness>,
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pub(crate) g_d_new_star: Option<[u8; 32]>,
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pub(crate) pk_d_new_star: Option<[u8; 32]>,
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pub(crate) v_new: Option<NoteValue>,
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pub(crate) psi_new: Option<pallas::Base>,
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pub(crate) rcm_new: Option<NoteCommitTrapdoor>,
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pub(crate) rcv: Option<ValueCommitTrapdoor>,
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}
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impl UtilitiesInstructions<pallas::Base> for Circuit {
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type Var = CellValue<pallas::Base>;
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}
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impl plonk::Circuit<pallas::Base> for Circuit {
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type Config = Config;
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type FloorPlanner = SimpleFloorPlanner;
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fn without_witnesses(&self) -> Self {
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Self::default()
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}
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fn configure(meta: &mut plonk::ConstraintSystem<pallas::Base>) -> Self::Config {
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// Advice columns used in the Orchard circuit.
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let advices = [
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meta.advice_column(),
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meta.advice_column(),
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meta.advice_column(),
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meta.advice_column(),
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meta.advice_column(),
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meta.advice_column(),
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meta.advice_column(),
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meta.advice_column(),
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meta.advice_column(),
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meta.advice_column(),
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];
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// Fixed columns for the Sinsemilla generator lookup table
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let table_idx = meta.fixed_column();
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let lookup = (table_idx, meta.fixed_column(), meta.fixed_column());
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// Shared fixed column used to load constants.
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// TODO: Replace with public inputs API
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let ecc_constants = [meta.fixed_column(), meta.fixed_column()];
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let sinsemilla_1_constants = [
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meta.fixed_column(),
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meta.fixed_column(),
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meta.fixed_column(),
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meta.fixed_column(),
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meta.fixed_column(),
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meta.fixed_column(),
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];
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let sinsemilla_2_constants = [
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meta.fixed_column(),
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meta.fixed_column(),
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meta.fixed_column(),
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meta.fixed_column(),
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meta.fixed_column(),
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meta.fixed_column(),
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];
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// Permutation over all advice columns and `constants` columns.
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// TODO: Replace `*_constants` with public inputs API.
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for advice in advices.iter() {
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meta.enable_equality((*advice).into());
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}
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for fixed in ecc_constants.iter() {
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meta.enable_equality((*fixed).into());
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}
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for fixed in sinsemilla_1_constants.iter() {
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meta.enable_equality((*fixed).into());
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}
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for fixed in sinsemilla_2_constants.iter() {
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meta.enable_equality((*fixed).into());
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}
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// Configuration for `enable_spends` and `enable_outputs` flags logic
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// TODO: this may change with public inputs API.
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let enable_flag_config = EnableFlagChip::configure(meta, [advices[0], advices[1]]);
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// Configuration for curve point operations.
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// This uses 10 advice columns and spans the whole circuit.
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let ecc_config = EccChip::configure(meta, advices, table_idx, ecc_constants);
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// Configuration for the Poseidon hash.
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let poseidon_config = PoseidonChip::configure(
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meta,
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poseidon::OrchardNullifier,
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[advices[0], advices[1], advices[2]],
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advices[3],
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);
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// Configuration for standard PLONK (addition and multiplication).
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let plonk_config = PLONKChip::configure(meta, [advices[0], advices[1], advices[2]]);
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// Configuration for a Sinsemilla hash instantiation and a
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// Merkle hash instantiation using this Sinsemilla instance.
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// Since the Sinsemilla config uses only 5 advice columns,
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// we can fit two instances side-by-side.
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let (sinsemilla_config_1, merkle_config_1) = {
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let sinsemilla_config_1 = SinsemillaChip::configure(
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meta,
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advices[..5].try_into().unwrap(),
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lookup,
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sinsemilla_1_constants,
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);
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let merkle_config_1 = MerkleChip::configure(meta, sinsemilla_config_1.clone());
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(sinsemilla_config_1, merkle_config_1)
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};
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// Configuration for a Sinsemilla hash instantiation and a
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// Merkle hash instantiation using this Sinsemilla instance.
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// Since the Sinsemilla config uses only 5 advice columns,
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// we can fit two instances side-by-side.
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let (sinsemilla_config_2, merkle_config_2) = {
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let sinsemilla_config_2 = SinsemillaChip::configure(
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meta,
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advices[5..].try_into().unwrap(),
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lookup,
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sinsemilla_2_constants,
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);
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let merkle_config_2 = MerkleChip::configure(meta, sinsemilla_config_2.clone());
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(sinsemilla_config_2, merkle_config_2)
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};
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// TODO: Infrastructure to handle public inputs.
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let q_primary = meta.selector();
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let primary = meta.instance_column();
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// Placeholder gate so there is something for the prover to operate on.
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// We need a selector so that the gate is disabled by default, and doesn't
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// interfere with the blinding factors.
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let advice = meta.advice_column();
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let selector = meta.selector();
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2021-06-01 09:37:44 -07:00
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meta.create_gate("TODO", |meta| {
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let a = meta.query_advice(advice, Rotation::cur());
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let s = meta.query_selector(selector);
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vec![s * a]
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});
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Config {
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q_primary,
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primary,
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advices,
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enable_flag_config,
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ecc_config,
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poseidon_config,
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plonk_config,
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merkle_config_1,
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merkle_config_2,
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sinsemilla_config_1,
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sinsemilla_config_2,
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}
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}
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fn synthesize(
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&self,
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config: Self::Config,
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mut layouter: impl Layouter<pallas::Base>,
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) -> Result<(), plonk::Error> {
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// Load the Sinsemilla generator lookup table used by the whole circuit.
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SinsemillaChip::load(config.sinsemilla_config_1.clone(), &mut layouter)?;
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// Construct the ECC chip.
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let ecc_chip = config.ecc_chip();
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// Witness private inputs that are used across multiple checks.
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let (rho_old, psi_old, cm_old, g_d_old, ak, nk, v_old, v_new) = {
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// Witness psi_old
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let psi_old = self.load_private(
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layouter.namespace(|| "witness psi_old"),
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config.advices[0],
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self.psi_old,
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)?;
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// Witness rho_old
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let rho_old = self.load_private(
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layouter.namespace(|| "witness rho_old"),
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config.advices[0],
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self.rho_old.map(|rho| rho.0),
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)?;
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// Witness cm_old
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let cm_old = Point::new(
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config.ecc_chip(),
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layouter.namespace(|| "cm_old"),
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self.cm_old.as_ref().map(|cm| cm.to_affine()),
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)?;
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// Witness g_d_old
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let g_d_old = Point::new(
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config.ecc_chip(),
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layouter.namespace(|| "gd_old"),
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self.g_d_old.as_ref().map(|gd| gd.to_affine()),
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)?;
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// Witness ak.
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let ak: Option<pallas::Point> = self.ak.as_ref().map(|ak| ak.into());
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let ak = Point::new(
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ecc_chip.clone(),
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layouter.namespace(|| "ak"),
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ak.map(|ak| ak.to_affine()),
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)?;
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// Witness nk.
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let nk = self.load_private(
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layouter.namespace(|| "witness nk"),
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config.advices[0],
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self.nk.map(|nk| *nk),
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)?;
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// Witness v_old.
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let v_old = self.load_private(
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layouter.namespace(|| "witness v_old"),
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config.advices[0],
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self.v_old
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.map(|v_old| pallas::Base::from_u64(v_old.inner())),
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)?;
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// Witness v_new.
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let v_new = self.load_private(
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layouter.namespace(|| "witness v_new"),
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config.advices[0],
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self.v_new
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.map(|v_new| pallas::Base::from_u64(v_new.inner())),
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)?;
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(rho_old, psi_old, cm_old, g_d_old, ak, nk, v_old, v_new)
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};
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2021-06-06 04:36:01 -07:00
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2021-04-14 21:35:48 -07:00
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Ok(())
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}
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}
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/// The verifying key for the Orchard Action circuit.
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#[derive(Debug)]
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pub struct VerifyingKey {
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params: halo2::poly::commitment::Params<vesta::Affine>,
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vk: plonk::VerifyingKey<vesta::Affine>,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl VerifyingKey {
|
|
|
|
/// Builds the verifying key.
|
|
|
|
pub fn build() -> Self {
|
|
|
|
let params = halo2::poly::commitment::Params::new(K);
|
2021-06-06 04:21:27 -07:00
|
|
|
let circuit: Circuit = Default::default(); // TODO
|
2021-04-14 21:35:48 -07:00
|
|
|
|
|
|
|
let vk = plonk::keygen_vk(¶ms, &circuit).unwrap();
|
|
|
|
|
|
|
|
VerifyingKey { params, vk }
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// The proving key for the Orchard Action circuit.
|
|
|
|
#[derive(Debug)]
|
|
|
|
pub struct ProvingKey {
|
|
|
|
params: halo2::poly::commitment::Params<vesta::Affine>,
|
|
|
|
pk: plonk::ProvingKey<vesta::Affine>,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl ProvingKey {
|
|
|
|
/// Builds the proving key.
|
|
|
|
pub fn build() -> Self {
|
|
|
|
let params = halo2::poly::commitment::Params::new(K);
|
2021-06-06 04:21:27 -07:00
|
|
|
let circuit: Circuit = Default::default(); // TODO
|
2021-04-14 21:35:48 -07:00
|
|
|
|
|
|
|
let vk = plonk::keygen_vk(¶ms, &circuit).unwrap();
|
|
|
|
let pk = plonk::keygen_pk(¶ms, vk, &circuit).unwrap();
|
|
|
|
|
|
|
|
ProvingKey { params, pk }
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Public inputs to the Orchard Action circuit.
|
|
|
|
#[derive(Debug)]
|
|
|
|
pub struct Instance {
|
|
|
|
pub(crate) anchor: Anchor,
|
|
|
|
pub(crate) cv_net: ValueCommitment,
|
|
|
|
pub(crate) nf_old: Nullifier,
|
|
|
|
pub(crate) rk: VerificationKey<SpendAuth>,
|
|
|
|
pub(crate) cmx: ExtractedNoteCommitment,
|
|
|
|
pub(crate) enable_spend: bool,
|
|
|
|
pub(crate) enable_output: bool,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Instance {
|
2021-07-15 04:52:15 -07:00
|
|
|
fn to_halo2_instance(&self) -> [[vesta::Scalar; 0]; 1] {
|
2021-04-14 21:35:48 -07:00
|
|
|
// TODO
|
2021-07-15 04:52:15 -07:00
|
|
|
[[]]
|
2021-04-14 21:35:48 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// A proof of the validity of an Orchard [`Bundle`].
|
|
|
|
///
|
|
|
|
/// [`Bundle`]: crate::bundle::Bundle
|
2021-05-13 14:35:44 -07:00
|
|
|
#[derive(Debug, Clone)]
|
2021-05-05 10:46:24 -07:00
|
|
|
pub struct Proof(Vec<u8>);
|
2021-04-14 21:35:48 -07:00
|
|
|
|
2021-05-05 10:37:56 -07:00
|
|
|
impl AsRef<[u8]> for Proof {
|
|
|
|
fn as_ref(&self) -> &[u8] {
|
|
|
|
&self.0
|
2021-04-21 13:32:54 -07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2021-04-14 21:35:48 -07:00
|
|
|
impl Proof {
|
2021-06-22 08:06:49 -07:00
|
|
|
/// Returns the amount of heap-allocated memory used by this proof.
|
|
|
|
pub(crate) fn dynamic_usage(&self) -> usize {
|
|
|
|
self.0.capacity() * mem::size_of::<u8>()
|
|
|
|
}
|
|
|
|
|
2021-04-14 21:35:48 -07:00
|
|
|
/// Creates a proof for the given circuits and instances.
|
|
|
|
pub fn create(
|
|
|
|
pk: &ProvingKey,
|
|
|
|
circuits: &[Circuit],
|
|
|
|
instances: &[Instance],
|
|
|
|
) -> Result<Self, plonk::Error> {
|
2021-07-15 04:52:15 -07:00
|
|
|
let instances: Vec<_> = instances.iter().map(|i| i.to_halo2_instance()).collect();
|
|
|
|
let instances: Vec<Vec<_>> = instances
|
2021-04-14 21:35:48 -07:00
|
|
|
.iter()
|
2021-07-15 04:52:15 -07:00
|
|
|
.map(|i| i.iter().map(|c| &c[..]).collect())
|
2021-04-14 21:35:48 -07:00
|
|
|
.collect();
|
|
|
|
let instances: Vec<_> = instances.iter().map(|i| &i[..]).collect();
|
|
|
|
|
2021-06-01 09:37:44 -07:00
|
|
|
let mut transcript = Blake2bWrite::<_, vesta::Affine, _>::init(vec![]);
|
2021-04-14 21:35:48 -07:00
|
|
|
plonk::create_proof(&pk.params, &pk.pk, circuits, &instances, &mut transcript)?;
|
|
|
|
Ok(Proof(transcript.finalize()))
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Verifies this proof with the given instances.
|
|
|
|
pub fn verify(&self, vk: &VerifyingKey, instances: &[Instance]) -> Result<(), plonk::Error> {
|
2021-07-15 04:52:15 -07:00
|
|
|
let instances: Vec<_> = instances.iter().map(|i| i.to_halo2_instance()).collect();
|
|
|
|
let instances: Vec<Vec<_>> = instances
|
2021-04-14 21:35:48 -07:00
|
|
|
.iter()
|
2021-07-15 04:52:15 -07:00
|
|
|
.map(|i| i.iter().map(|c| &c[..]).collect())
|
2021-04-14 21:35:48 -07:00
|
|
|
.collect();
|
|
|
|
let instances: Vec<_> = instances.iter().map(|i| &i[..]).collect();
|
|
|
|
|
|
|
|
let msm = vk.params.empty_msm();
|
|
|
|
let mut transcript = Blake2bRead::init(&self.0[..]);
|
|
|
|
let guard = plonk::verify_proof(&vk.params, &vk.vk, msm, &instances, &mut transcript)?;
|
|
|
|
let msm = guard.clone().use_challenges();
|
|
|
|
if msm.eval() {
|
|
|
|
Ok(())
|
|
|
|
} else {
|
|
|
|
Err(plonk::Error::ConstraintSystemFailure)
|
|
|
|
}
|
|
|
|
}
|
2021-04-21 08:57:48 -07:00
|
|
|
|
2021-05-05 10:37:56 -07:00
|
|
|
/// Constructs a new Proof value.
|
2021-04-21 08:57:48 -07:00
|
|
|
pub fn new(bytes: Vec<u8>) -> Self {
|
|
|
|
Proof(bytes)
|
|
|
|
}
|
2021-04-14 21:35:48 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
#[cfg(test)]
|
|
|
|
mod tests {
|
|
|
|
use ff::Field;
|
2021-06-06 04:21:27 -07:00
|
|
|
use group::GroupEncoding;
|
2021-04-14 21:35:48 -07:00
|
|
|
use halo2::dev::MockProver;
|
|
|
|
use pasta_curves::pallas;
|
|
|
|
use rand::rngs::OsRng;
|
|
|
|
use std::iter;
|
|
|
|
|
|
|
|
use super::{Circuit, Instance, Proof, ProvingKey, VerifyingKey, K};
|
|
|
|
use crate::{
|
|
|
|
keys::SpendValidatingKey,
|
|
|
|
note::Note,
|
2021-06-06 04:21:27 -07:00
|
|
|
tree::MerklePath,
|
2021-04-14 21:35:48 -07:00
|
|
|
value::{ValueCommitTrapdoor, ValueCommitment},
|
|
|
|
};
|
|
|
|
|
2021-04-21 08:57:48 -07:00
|
|
|
// TODO: recast as a proptest
|
2021-04-14 21:35:48 -07:00
|
|
|
#[test]
|
|
|
|
fn round_trip() {
|
|
|
|
let mut rng = OsRng;
|
|
|
|
|
|
|
|
let (circuits, instances): (Vec<_>, Vec<_>) = iter::once(())
|
|
|
|
.map(|()| {
|
2021-04-26 17:25:03 -07:00
|
|
|
let (_, fvk, spent_note) = Note::dummy(&mut rng, None);
|
2021-06-06 04:21:27 -07:00
|
|
|
let sender_address = fvk.default_address();
|
|
|
|
let nk = *fvk.nk();
|
|
|
|
let rivk = *fvk.rivk();
|
2021-04-14 21:35:48 -07:00
|
|
|
let nf_old = spent_note.nullifier(&fvk);
|
|
|
|
let ak: SpendValidatingKey = fvk.into();
|
|
|
|
let alpha = pallas::Scalar::random(&mut rng);
|
|
|
|
let rk = ak.randomize(&alpha);
|
|
|
|
|
2021-05-28 04:06:50 -07:00
|
|
|
let (_, _, output_note) = Note::dummy(&mut rng, Some(nf_old));
|
2021-04-14 21:35:48 -07:00
|
|
|
let cmx = output_note.commitment().into();
|
|
|
|
|
|
|
|
let value = spent_note.value() - output_note.value();
|
|
|
|
let cv_net = ValueCommitment::derive(value.unwrap(), ValueCommitTrapdoor::zero());
|
|
|
|
|
2021-06-06 04:21:27 -07:00
|
|
|
let path = MerklePath::dummy(&mut rng);
|
|
|
|
let anchor = path.root(spent_note.commitment().into()).unwrap();
|
|
|
|
|
2021-04-14 21:35:48 -07:00
|
|
|
(
|
2021-06-06 04:21:27 -07:00
|
|
|
Circuit {
|
|
|
|
path: Some(path.auth_path()),
|
|
|
|
pos: Some(path.position()),
|
|
|
|
g_d_old: Some(sender_address.g_d()),
|
|
|
|
pk_d_old: Some(*sender_address.pk_d()),
|
|
|
|
v_old: Some(spent_note.value()),
|
|
|
|
rho_old: Some(spent_note.rho()),
|
|
|
|
psi_old: Some(spent_note.rseed().psi(&spent_note.rho())),
|
|
|
|
rcm_old: Some(spent_note.rseed().rcm(&spent_note.rho())),
|
|
|
|
cm_old: Some(spent_note.commitment()),
|
|
|
|
alpha: Some(alpha),
|
|
|
|
ak: Some(ak),
|
|
|
|
nk: Some(nk),
|
|
|
|
rivk: Some(rivk),
|
|
|
|
g_d_new_star: Some((*output_note.recipient().g_d()).to_bytes()),
|
|
|
|
pk_d_new_star: Some(output_note.recipient().pk_d().to_bytes()),
|
|
|
|
v_new: Some(output_note.value()),
|
|
|
|
psi_new: Some(output_note.rseed().psi(&output_note.rho())),
|
|
|
|
rcm_new: Some(output_note.rseed().rcm(&output_note.rho())),
|
|
|
|
rcv: Some(ValueCommitTrapdoor::zero()),
|
|
|
|
},
|
2021-04-14 21:35:48 -07:00
|
|
|
Instance {
|
2021-06-06 04:21:27 -07:00
|
|
|
anchor,
|
2021-04-14 21:35:48 -07:00
|
|
|
cv_net,
|
|
|
|
nf_old,
|
|
|
|
rk,
|
|
|
|
cmx,
|
|
|
|
enable_spend: true,
|
|
|
|
enable_output: true,
|
|
|
|
},
|
|
|
|
)
|
|
|
|
})
|
|
|
|
.unzip();
|
|
|
|
|
|
|
|
let vk = VerifyingKey::build();
|
|
|
|
for (circuit, instance) in circuits.iter().zip(instances.iter()) {
|
|
|
|
assert_eq!(
|
|
|
|
MockProver::run(
|
|
|
|
K,
|
|
|
|
circuit,
|
|
|
|
instance
|
2021-07-15 04:52:15 -07:00
|
|
|
.to_halo2_instance()
|
2021-04-14 21:35:48 -07:00
|
|
|
.iter()
|
2021-07-15 04:52:15 -07:00
|
|
|
.map(|p| p.to_vec())
|
2021-04-14 21:35:48 -07:00
|
|
|
.collect()
|
|
|
|
)
|
|
|
|
.unwrap()
|
|
|
|
.verify(),
|
|
|
|
Ok(())
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
|
|
|
let pk = ProvingKey::build();
|
|
|
|
let proof = Proof::create(&pk, &circuits, &instances).unwrap();
|
|
|
|
assert!(proof.verify(&vk, &instances).is_ok());
|
|
|
|
}
|
|
|
|
}
|