mirror of https://github.com/zcash/halo2.git
293 lines
8.8 KiB
Rust
293 lines
8.8 KiB
Rust
use halo2::{
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arithmetic::{Curve, FieldExt},
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model::ModelRecorder,
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plonk::*,
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poly::commitment::{Blind, Params},
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transcript::DummyHash,
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tweedle::{EqAffine, Fp, Fq},
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};
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use std::marker::PhantomData;
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/// This represents an advice column at a certain row in the ConstraintSystem
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#[derive(Copy, Clone, Debug)]
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pub struct Variable(Column<Advice>, usize);
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struct PLONKConfig {
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a: Column<Advice>,
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b: Column<Advice>,
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c: Column<Advice>,
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sa: Column<Fixed>,
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sb: Column<Fixed>,
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sc: Column<Fixed>,
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sm: Column<Fixed>,
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sp: Column<Fixed>,
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perm: usize,
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}
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trait StandardCS<FF: FieldExt> {
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fn raw_multiply<F>(&mut self, f: F) -> Result<(Variable, Variable, Variable), Error>
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where
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F: FnOnce() -> Result<(FF, FF, FF), Error>;
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fn raw_add<F>(&mut self, f: F) -> Result<(Variable, Variable, Variable), Error>
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where
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F: FnOnce() -> Result<(FF, FF, FF), Error>;
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fn copy(&mut self, a: Variable, b: Variable) -> Result<(), Error>;
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fn public_input<F>(&mut self, f: F) -> Result<Variable, Error>
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where
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F: FnOnce() -> Result<FF, Error>;
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}
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struct MyCircuit<F: FieldExt> {
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a: Option<F>,
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k: u32,
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}
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struct StandardPLONK<'a, F: FieldExt, CS: Assignment<F> + 'a> {
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cs: &'a mut CS,
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config: PLONKConfig,
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current_gate: usize,
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_marker: PhantomData<F>,
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}
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impl<'a, FF: FieldExt, CS: Assignment<FF>> StandardPLONK<'a, FF, CS> {
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fn new(cs: &'a mut CS, config: PLONKConfig) -> Self {
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StandardPLONK {
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cs,
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config,
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current_gate: 0,
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_marker: PhantomData,
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}
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}
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}
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impl<'a, FF: FieldExt, CS: Assignment<FF>> StandardCS<FF> for StandardPLONK<'a, FF, CS> {
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fn raw_multiply<F>(&mut self, f: F) -> Result<(Variable, Variable, Variable), Error>
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where
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F: FnOnce() -> Result<(FF, FF, FF), Error>,
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{
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let index = self.current_gate;
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self.current_gate += 1;
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let mut value = None;
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self.cs.assign_advice(self.config.a, index, || {
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value = Some(f()?);
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Ok(value.ok_or(Error::SynthesisError)?.0)
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})?;
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self.cs.assign_advice(self.config.b, index, || {
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Ok(value.ok_or(Error::SynthesisError)?.1)
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})?;
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self.cs.assign_advice(self.config.c, index, || {
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Ok(value.ok_or(Error::SynthesisError)?.2)
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})?;
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self.cs
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.assign_fixed(self.config.sa, index, || Ok(FF::zero()))?;
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self.cs
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.assign_fixed(self.config.sb, index, || Ok(FF::zero()))?;
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self.cs
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.assign_fixed(self.config.sc, index, || Ok(FF::one()))?;
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self.cs
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.assign_fixed(self.config.sm, index, || Ok(FF::one()))?;
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Ok((
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Variable(self.config.a, index),
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Variable(self.config.b, index),
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Variable(self.config.c, index),
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))
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}
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fn raw_add<F>(&mut self, f: F) -> Result<(Variable, Variable, Variable), Error>
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where
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F: FnOnce() -> Result<(FF, FF, FF), Error>,
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{
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let index = self.current_gate;
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self.current_gate += 1;
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let mut value = None;
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self.cs.assign_advice(self.config.a, index, || {
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value = Some(f()?);
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Ok(value.ok_or(Error::SynthesisError)?.0)
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})?;
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self.cs.assign_advice(self.config.b, index, || {
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Ok(value.ok_or(Error::SynthesisError)?.1)
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})?;
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self.cs.assign_advice(self.config.c, index, || {
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Ok(value.ok_or(Error::SynthesisError)?.2)
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})?;
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self.cs
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.assign_fixed(self.config.sa, index, || Ok(FF::one()))?;
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self.cs
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.assign_fixed(self.config.sb, index, || Ok(FF::one()))?;
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self.cs
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.assign_fixed(self.config.sc, index, || Ok(FF::one()))?;
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self.cs
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.assign_fixed(self.config.sm, index, || Ok(FF::zero()))?;
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Ok((
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Variable(self.config.a, index),
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Variable(self.config.b, index),
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Variable(self.config.c, index),
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))
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}
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fn copy(&mut self, left: Variable, right: Variable) -> Result<(), Error> {
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let left_column = match left.0 {
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x if x == self.config.a => 0,
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x if x == self.config.b => 1,
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x if x == self.config.c => 2,
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_ => unreachable!(),
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};
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let right_column = match right.0 {
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x if x == self.config.a => 0,
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x if x == self.config.b => 1,
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x if x == self.config.c => 2,
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_ => unreachable!(),
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};
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self.cs
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.copy(self.config.perm, left_column, left.1, right_column, right.1)
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}
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fn public_input<F>(&mut self, f: F) -> Result<Variable, Error>
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where
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F: FnOnce() -> Result<FF, Error>,
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{
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let index = self.current_gate;
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self.current_gate += 1;
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self.cs.assign_advice(self.config.a, index, || f())?;
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self.cs
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.assign_fixed(self.config.sp, index, || Ok(FF::one()))?;
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Ok(Variable(self.config.a, index))
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}
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}
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impl<F: FieldExt> Circuit<F> for MyCircuit<F> {
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type Config = PLONKConfig;
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fn configure(meta: &mut ConstraintSystem<F>) -> PLONKConfig {
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let a = meta.advice_column();
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let b = meta.advice_column();
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let c = meta.advice_column();
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let p = meta.aux_column();
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let perm = meta.permutation(&[a, b, c]);
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let sm = meta.fixed_column();
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let sa = meta.fixed_column();
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let sb = meta.fixed_column();
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let sc = meta.fixed_column();
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let sp = meta.fixed_column();
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meta.create_gate(|meta| {
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let a = meta.query_advice(a, 0);
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let b = meta.query_advice(b, 0);
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let c = meta.query_advice(c, 0);
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let sa = meta.query_fixed(sa, 0);
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let sb = meta.query_fixed(sb, 0);
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let sc = meta.query_fixed(sc, 0);
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let sm = meta.query_fixed(sm, 0);
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a.clone() * sa + b.clone() * sb + a * b * sm + (c * sc * (-F::one()))
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});
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meta.create_gate(|meta| {
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let a = meta.query_advice(a, 0);
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let p = meta.query_aux(p, 0);
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let sp = meta.query_fixed(sp, 0);
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sp * (a + p * (-F::one()))
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});
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PLONKConfig {
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a,
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b,
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c,
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sa,
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sb,
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sc,
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sm,
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sp,
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perm,
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}
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}
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fn synthesize(&self, cs: &mut impl Assignment<F>, config: PLONKConfig) -> Result<(), Error> {
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let mut cs = StandardPLONK::new(cs, config);
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let _ = cs.public_input(|| Ok(F::one() + F::one()))?;
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for _ in 0..((1 << (self.k - 1)) - 1) {
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let mut a_squared = None;
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let (a0, _, c0) = cs.raw_multiply(|| {
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a_squared = self.a.map(|a| a.square());
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Ok((
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self.a.ok_or(Error::SynthesisError)?,
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self.a.ok_or(Error::SynthesisError)?,
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a_squared.ok_or(Error::SynthesisError)?,
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))
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})?;
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let (a1, b1, _) = cs.raw_add(|| {
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let fin = a_squared.and_then(|a2| self.a.map(|a| a + a2));
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Ok((
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self.a.ok_or(Error::SynthesisError)?,
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a_squared.ok_or(Error::SynthesisError)?,
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fin.ok_or(Error::SynthesisError)?,
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))
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})?;
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cs.copy(a0, a1)?;
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cs.copy(b1, c0)?;
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}
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Ok(())
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}
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}
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fn main() {
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let recorder = Box::leak(Box::new(ModelRecorder::default()));
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metrics::set_recorder(recorder).unwrap();
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// TODO: Make dynamic.
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let k = 11;
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// Initialize the polynomial commitment parameters
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let params: Params<EqAffine> = Params::new::<DummyHash<Fq>>(k);
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let empty_circuit: MyCircuit<Fp> = MyCircuit { a: None, k };
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// Initialize the proving key
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let pk = keygen(¶ms, &empty_circuit).expect("keygen should not fail");
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println!("[Keygen] {}", recorder);
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recorder.clear();
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let mut pubinputs = pk.get_vk().get_domain().empty_lagrange();
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pubinputs[0] = Fp::one();
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pubinputs[0] += Fp::one();
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let pubinput = params
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.commit_lagrange(&pubinputs, Blind::default())
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.to_affine();
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recorder.clear();
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let circuit: MyCircuit<Fp> = MyCircuit {
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a: Some(Fp::rand()),
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k,
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};
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// Create a proof
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let proof =
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Proof::create::<DummyHash<Fq>, DummyHash<Fp>, _>(¶ms, &pk, &circuit, &[pubinputs])
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.expect("proof generation should not fail");
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println!("[Prover] {}", recorder);
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recorder.clear();
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let pubinput_slice = &[pubinput];
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let msm = params.empty_msm();
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let guard = proof
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.verify::<DummyHash<Fq>, DummyHash<Fp>>(¶ms, pk.get_vk(), msm, pubinput_slice)
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.unwrap();
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let msm = guard.clone().use_challenges();
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assert!(msm.eval());
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println!("[Verifier] {}", recorder);
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}
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