#[cfg(feature = "alloc")]
use crate::{
fft::{EvaluationDomain, Polynomial},
proof_system::ProverKey,
};
use dusk_bls12_381::BlsScalar;
use dusk_bytes::{DeserializableSlice, Serializable};
#[cfg(feature = "rkyv-impl")]
use bytecheck::CheckBytes;
#[cfg(feature = "rkyv-impl")]
use rkyv::{
ser::{ScratchSpace, Serializer},
Archive, Deserialize, Serialize,
};
#[allow(dead_code)]
pub(crate) struct Evaluations {
pub(crate) proof: ProofEvaluations,
pub(crate) t_eval: BlsScalar,
}
#[derive(Debug, Eq, PartialEq, Clone, Default)]
#[cfg_attr(
feature = "rkyv-impl",
derive(Archive, Deserialize, Serialize),
archive(bound(serialize = "__S: Serializer + ScratchSpace")),
archive_attr(derive(CheckBytes))
)]
pub(crate) struct ProofEvaluations {
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) a_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) b_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) c_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) d_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) a_next_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) b_next_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) d_next_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) q_arith_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) q_c_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) q_l_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) q_r_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) s_sigma_1_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) s_sigma_2_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) s_sigma_3_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) r_poly_eval: BlsScalar,
#[cfg_attr(feature = "rkyv-impl", omit_bounds)]
pub(crate) perm_eval: BlsScalar,
}
impl Serializable<{ 16 * BlsScalar::SIZE }> for ProofEvaluations {
type Error = dusk_bytes::Error;
#[allow(unused_must_use)]
fn to_bytes(&self) -> [u8; Self::SIZE] {
use dusk_bytes::Write;
let mut buf = [0u8; Self::SIZE];
let mut writer = &mut buf[..];
writer.write(&self.a_eval.to_bytes());
writer.write(&self.b_eval.to_bytes());
writer.write(&self.c_eval.to_bytes());
writer.write(&self.d_eval.to_bytes());
writer.write(&self.a_next_eval.to_bytes());
writer.write(&self.b_next_eval.to_bytes());
writer.write(&self.d_next_eval.to_bytes());
writer.write(&self.q_arith_eval.to_bytes());
writer.write(&self.q_c_eval.to_bytes());
writer.write(&self.q_l_eval.to_bytes());
writer.write(&self.q_r_eval.to_bytes());
writer.write(&self.s_sigma_1_eval.to_bytes());
writer.write(&self.s_sigma_2_eval.to_bytes());
writer.write(&self.s_sigma_3_eval.to_bytes());
writer.write(&self.r_poly_eval.to_bytes());
writer.write(&self.perm_eval.to_bytes());
buf
}
fn from_bytes(
buf: &[u8; Self::SIZE],
) -> Result<ProofEvaluations, Self::Error> {
let mut buffer = &buf[..];
let a_eval = BlsScalar::from_reader(&mut buffer)?;
let b_eval = BlsScalar::from_reader(&mut buffer)?;
let c_eval = BlsScalar::from_reader(&mut buffer)?;
let d_eval = BlsScalar::from_reader(&mut buffer)?;
let a_next_eval = BlsScalar::from_reader(&mut buffer)?;
let b_next_eval = BlsScalar::from_reader(&mut buffer)?;
let d_next_eval = BlsScalar::from_reader(&mut buffer)?;
let q_arith_eval = BlsScalar::from_reader(&mut buffer)?;
let q_c_eval = BlsScalar::from_reader(&mut buffer)?;
let q_l_eval = BlsScalar::from_reader(&mut buffer)?;
let q_r_eval = BlsScalar::from_reader(&mut buffer)?;
let s_sigma_1_eval = BlsScalar::from_reader(&mut buffer)?;
let s_sigma_2_eval = BlsScalar::from_reader(&mut buffer)?;
let s_sigma_3_eval = BlsScalar::from_reader(&mut buffer)?;
let r_poly_eval = BlsScalar::from_reader(&mut buffer)?;
let perm_eval = BlsScalar::from_reader(&mut buffer)?;
Ok(ProofEvaluations {
a_eval,
b_eval,
c_eval,
d_eval,
a_next_eval,
b_next_eval,
d_next_eval,
q_arith_eval,
q_c_eval,
q_l_eval,
q_r_eval,
s_sigma_1_eval,
s_sigma_2_eval,
s_sigma_3_eval,
r_poly_eval,
perm_eval,
})
}
}
#[cfg(feature = "alloc")]
#[allow(clippy::type_complexity)]
pub(crate) fn compute(
domain: &EvaluationDomain,
prover_key: &ProverKey,
(
alpha,
beta,
gamma,
range_separation_challenge,
logic_separation_challenge,
fixed_base_separation_challenge,
var_base_separation_challenge,
z_challenge,
): &(
BlsScalar,
BlsScalar,
BlsScalar,
BlsScalar,
BlsScalar,
BlsScalar,
BlsScalar,
BlsScalar,
),
a_w_poly: &Polynomial,
b_w_poly: &Polynomial,
c_w_poly: &Polynomial,
d_w_poly: &Polynomial,
t_x_poly: &Polynomial,
z_poly: &Polynomial,
) -> (Polynomial, Evaluations) {
let t_eval = t_x_poly.evaluate(z_challenge);
let a_eval = a_w_poly.evaluate(z_challenge);
let b_eval = b_w_poly.evaluate(z_challenge);
let c_eval = c_w_poly.evaluate(z_challenge);
let d_eval = d_w_poly.evaluate(z_challenge);
let s_sigma_1_eval =
prover_key.permutation.s_sigma_1.0.evaluate(z_challenge);
let s_sigma_2_eval =
prover_key.permutation.s_sigma_2.0.evaluate(z_challenge);
let s_sigma_3_eval =
prover_key.permutation.s_sigma_3.0.evaluate(z_challenge);
let q_arith_eval = prover_key.arithmetic.q_arith.0.evaluate(z_challenge);
let q_c_eval = prover_key.logic.q_c.0.evaluate(z_challenge);
let q_l_eval = prover_key.fixed_base.q_l.0.evaluate(z_challenge);
let q_r_eval = prover_key.fixed_base.q_r.0.evaluate(z_challenge);
let a_next_eval = a_w_poly.evaluate(&(z_challenge * domain.group_gen));
let b_next_eval = b_w_poly.evaluate(&(z_challenge * domain.group_gen));
let d_next_eval = d_w_poly.evaluate(&(z_challenge * domain.group_gen));
let perm_eval = z_poly.evaluate(&(z_challenge * domain.group_gen));
let f_1 = compute_circuit_satisfiability(
(
range_separation_challenge,
logic_separation_challenge,
fixed_base_separation_challenge,
var_base_separation_challenge,
),
&a_eval,
&b_eval,
&c_eval,
&d_eval,
&a_next_eval,
&b_next_eval,
&d_next_eval,
&q_arith_eval,
&q_c_eval,
&q_l_eval,
&q_r_eval,
prover_key,
);
let f_2 = prover_key.permutation.compute_linearization(
z_challenge,
(alpha, beta, gamma),
(&a_eval, &b_eval, &c_eval, &d_eval),
(&s_sigma_1_eval, &s_sigma_2_eval, &s_sigma_3_eval),
&perm_eval,
z_poly,
);
let r_poly = &f_1 + &f_2;
let r_poly_eval = r_poly.evaluate(z_challenge);
(
r_poly,
Evaluations {
proof: ProofEvaluations {
a_eval,
b_eval,
c_eval,
d_eval,
a_next_eval,
b_next_eval,
d_next_eval,
q_arith_eval,
q_c_eval,
q_l_eval,
q_r_eval,
s_sigma_1_eval,
s_sigma_2_eval,
s_sigma_3_eval,
r_poly_eval,
perm_eval,
},
t_eval,
},
)
}
#[cfg(feature = "alloc")]
fn compute_circuit_satisfiability(
(
range_separation_challenge,
logic_separation_challenge,
fixed_base_separation_challenge,
var_base_separation_challenge,
): (&BlsScalar, &BlsScalar, &BlsScalar, &BlsScalar),
a_eval: &BlsScalar,
b_eval: &BlsScalar,
c_eval: &BlsScalar,
d_eval: &BlsScalar,
a_next_eval: &BlsScalar,
b_next_eval: &BlsScalar,
d_next_eval: &BlsScalar,
q_arith_eval: &BlsScalar,
q_c_eval: &BlsScalar,
q_l_eval: &BlsScalar,
q_r_eval: &BlsScalar,
prover_key: &ProverKey,
) -> Polynomial {
let a = prover_key.arithmetic.compute_linearization(
a_eval,
b_eval,
c_eval,
d_eval,
q_arith_eval,
);
let b = prover_key.range.compute_linearization(
range_separation_challenge,
a_eval,
b_eval,
c_eval,
d_eval,
d_next_eval,
);
let c = prover_key.logic.compute_linearization(
logic_separation_challenge,
a_eval,
a_next_eval,
b_eval,
b_next_eval,
c_eval,
d_eval,
d_next_eval,
q_c_eval,
);
let d = prover_key.fixed_base.compute_linearization(
fixed_base_separation_challenge,
a_eval,
a_next_eval,
b_eval,
b_next_eval,
c_eval,
d_eval,
d_next_eval,
q_l_eval,
q_r_eval,
q_c_eval,
);
let e = prover_key.variable_base.compute_linearization(
var_base_separation_challenge,
a_eval,
a_next_eval,
b_eval,
b_next_eval,
c_eval,
d_eval,
d_next_eval,
);
let mut linearization_poly = &a + &b;
linearization_poly += &c;
linearization_poly += &d;
linearization_poly += &e;
linearization_poly
}
#[cfg(test)]
mod evaluations_tests {
use super::*;
#[test]
fn proof_evaluations_dusk_bytes_serde() {
let proof_evals = ProofEvaluations::default();
let bytes = proof_evals.to_bytes();
let obtained_evals = ProofEvaluations::from_slice(&bytes)
.expect("Deserialization error");
assert_eq!(proof_evals.to_bytes(), obtained_evals.to_bytes())
}
}