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feat: allow group switching, and switch group by default (#33)

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This commit is contained in:
zhenfei
2022-06-15 17:39:54 -04:00
committed by GitHub
parent 1d12a3e582
commit 3b58050b27
5 changed files with 103 additions and 9 deletions
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8
pcs/Cargo.toml
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@@ -24,8 +24,9 @@ path = "benches/bench.rs"
harness = false
[features]
default = [ "parallel", "print-trace" ]
# default = [ "parallel" ]
# by default we switch the groups
# default = [ "parallel", "print-trace", "group-switched" ]
default = [ "parallel", "group-switched" ]
parallel = [
"ark-std/parallel",
"ark-ff/parallel",
@@ -35,3 +36,6 @@ parallel = [
print-trace = [
"ark-std/print-trace"
]
# With the flag, we switch the groups of G1 and G2 as in a normal KZG.
# i.e., commitments are over G2 and openings are over G1 when this feature is turned on.
group-switched = []

4
pcs/readme.md
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@@ -1,3 +1,7 @@
KZG based multilinear polynomial commitment
-----
# Compiling features:
- `parallel`: use multi-threading when possible.
- `print-trace`: print out user friendly information about the running time for each micro component.
- `group-switched`: witch the groups of G1 and G2 as in a normal KZG. i.e., commitments are over G2 and openings are over G1 when this feature is turned on.

35
pcs/src/commit.rs
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@@ -18,14 +18,20 @@ pub struct Commitment<E: PairingEngine> {
/// number of variables
pub nv: usize,
/// product of g as described by the vRAM paper
#[cfg(not(feature = "group-switched"))]
pub g_product: E::G1Affine,
#[cfg(feature = "group-switched")]
pub g_product: E::G2Affine,
}
#[derive(CanonicalSerialize, CanonicalDeserialize, Clone, Debug)]
/// proof of opening
pub struct Proof<E: PairingEngine> {
/// Evaluation of quotients
#[cfg(not(feature = "group-switched"))]
pub proofs: Vec<E::G2Affine>,
#[cfg(feature = "group-switched")]
pub proofs: Vec<E::G1Affine>,
}
impl<E: PairingEngine> MultilinearCommitmentScheme<E> for KZGMultilinearPC<E> {
@@ -160,20 +166,28 @@ impl<E: PairingEngine> MultilinearCommitmentScheme<E> for KZGMultilinearPC<E> {
window_size,
verifier_param.g.into_projective(),
);
#[cfg(not(feature = "group-switched"))]
let g_mul: Vec<E::G1Projective> =
FixedBaseMSM::multi_scalar_mul(scalar_size, window_size, &g_table, point);
#[cfg(feature = "group-switched")]
let g_mul: Vec<E::G2Projective> =
FixedBaseMSM::multi_scalar_mul(scalar_size, window_size, &g_table, point);
let mut g1_vec: Vec<_> = (0..verifier_param.num_vars)
.map(|i| verifier_param.g_mask[i].into_projective() - g_mul[i])
.collect();
g1_vec.push(verifier_param.g.mul(value) - commitment.g_product.into_projective());
#[cfg(not(feature = "group-switched"))]
let g1_vec: Vec<E::G1Affine> = E::G1Projective::batch_normalization_into_affine(&g1_vec);
#[cfg(feature = "group-switched")]
let g1_vec: Vec<E::G2Affine> = E::G2Projective::batch_normalization_into_affine(&g1_vec);
let tmp = g1_vec[verifier_param.num_vars];
end_timer!(prepare_inputs_timer);
let pairing_product_timer = start_timer!(|| "pairing product");
#[cfg(not(feature = "group-switched"))]
let mut pairings: Vec<_> = g1_vec
.into_iter()
.take(verifier_param.num_vars)
@@ -181,11 +195,32 @@ impl<E: PairingEngine> MultilinearCommitmentScheme<E> for KZGMultilinearPC<E> {
.zip(proof.proofs.iter().map(|&x| E::G2Prepared::from(x)))
.collect();
#[cfg(feature = "group-switched")]
let mut pairings: Vec<_> = proof
.proofs
.iter()
.take(verifier_param.num_vars)
.map(|&x| E::G1Prepared::from(x))
.zip(
g1_vec
.into_iter()
.take(verifier_param.num_vars)
.map(E::G2Prepared::from),
)
.collect();
#[cfg(not(feature = "group-switched"))]
pairings.push((
E::G1Prepared::from(tmp),
E::G2Prepared::from(verifier_param.h),
));
#[cfg(feature = "group-switched")]
pairings.push((
E::G1Prepared::from(verifier_param.h),
E::G2Prepared::from(tmp),
));
let res = E::product_of_pairings(pairings.iter()) == E::Fqk::one();
end_timer!(pairing_product_timer);

62
pcs/src/param.rs
View File

@@ -19,7 +19,10 @@ pub struct UniversalParams<E: PairingEngine> {
/// prover parameters
pub prover_param: ProverParam<E>,
/// g^randomness: g^t1, g^t2, ...
#[cfg(not(feature = "group-switched"))]
pub g_mask: Vec<E::G1Affine>,
#[cfg(feature = "group-switched")]
pub g_mask: Vec<E::G2Affine>,
}
/// Prover Parameters
@@ -29,14 +32,26 @@ pub struct ProverParam<E: PairingEngine> {
pub num_vars: usize,
/// `pp_{num_vars}`, `pp_{num_vars - 1}`, `pp_{num_vars - 2}`, ..., defined
/// by XZZPD19
#[cfg(not(feature = "group-switched"))]
pub powers_of_g: Vec<Evaluations<E::G1Affine>>,
#[cfg(feature = "group-switched")]
pub powers_of_g: Vec<Evaluations<E::G2Affine>>,
/// `pp_{num_vars}`, `pp_{num_vars - 1}`, `pp_{num_vars - 2}`, ..., defined
/// by XZZPD19
#[cfg(not(feature = "group-switched"))]
pub powers_of_h: Vec<Evaluations<E::G2Affine>>,
#[cfg(feature = "group-switched")]
pub powers_of_h: Vec<Evaluations<E::G1Affine>>,
/// generator for G1
#[cfg(not(feature = "group-switched"))]
pub g: E::G1Affine,
#[cfg(feature = "group-switched")]
pub g: E::G2Affine,
/// generator for G2
#[cfg(not(feature = "group-switched"))]
pub h: E::G2Affine,
#[cfg(feature = "group-switched")]
pub h: E::G1Affine,
}
/// Verifier Parameters
@@ -44,12 +59,24 @@ pub struct ProverParam<E: PairingEngine> {
pub struct VerifierParam<E: PairingEngine> {
/// number of variables
pub num_vars: usize,
/// generator of G1
#[cfg(not(feature = "group-switched"))]
pub g: E::G1Affine,
#[cfg(feature = "group-switched")]
pub g: E::G2Affine,
/// generator of G2
#[cfg(not(feature = "group-switched"))]
pub h: E::G2Affine,
#[cfg(feature = "group-switched")]
pub h: E::G1Affine,
/// g^t1, g^t2, ...
#[cfg(not(feature = "group-switched"))]
pub g_mask: Vec<E::G1Affine>,
#[cfg(feature = "group-switched")]
pub g_mask: Vec<E::G2Affine>,
}
impl<E: PairingEngine> UniversalParams<E> {
@@ -116,8 +143,16 @@ impl<E: PairingEngine> UniversalParams<E> {
let total_timer = start_timer!(|| "SRS generation");
let pp_generation_timer = start_timer!(|| "Prover Param generation");
#[cfg(not(feature = "group-switched"))]
let g = E::G1Projective::rand(rng);
#[cfg(feature = "group-switched")]
let g = E::G2Projective::rand(rng);
#[cfg(not(feature = "group-switched"))]
let h = E::G2Projective::rand(rng);
#[cfg(feature = "group-switched")]
let h = E::G1Projective::rand(rng);
let mut powers_of_g = Vec::new();
let mut powers_of_h = Vec::new();
@@ -153,12 +188,22 @@ impl<E: PairingEngine> UniversalParams<E> {
let g_table = FixedBaseMSM::get_window_table(scalar_bits, window_size, g);
let h_table = FixedBaseMSM::get_window_table(scalar_bits, window_size, h);
#[cfg(not(feature = "group-switched"))]
let pp_g = E::G1Projective::batch_normalization_into_affine(
&FixedBaseMSM::multi_scalar_mul(scalar_bits, window_size, &g_table, &pp_powers),
);
#[cfg(feature = "group-switched")]
let pp_g = E::G2Projective::batch_normalization_into_affine(
&FixedBaseMSM::multi_scalar_mul(scalar_bits, window_size, &g_table, &pp_powers),
);
#[cfg(not(feature = "group-switched"))]
let pp_h = E::G2Projective::batch_normalization_into_affine(
&FixedBaseMSM::multi_scalar_mul(scalar_bits, window_size, &h_table, &pp_powers),
);
#[cfg(feature = "group-switched")]
let pp_h = E::G1Projective::batch_normalization_into_affine(
&FixedBaseMSM::multi_scalar_mul(scalar_bits, window_size, &h_table, &pp_powers),
);
let mut start = 0;
for i in 0..num_vars {
let size = 1 << (num_vars - i);
@@ -187,12 +232,17 @@ impl<E: PairingEngine> UniversalParams<E> {
let g_mask = {
let window_size = FixedBaseMSM::get_mul_window_size(num_vars);
let g_table = FixedBaseMSM::get_window_table(scalar_bits, window_size, g);
E::G1Projective::batch_normalization_into_affine(&FixedBaseMSM::multi_scalar_mul(
scalar_bits,
window_size,
&g_table,
&t,
))
#[cfg(not(feature = "group-switched"))]
let res = E::G1Projective::batch_normalization_into_affine(
&FixedBaseMSM::multi_scalar_mul(scalar_bits, window_size, &g_table, &t),
);
#[cfg(feature = "group-switched")]
let res = E::G2Projective::batch_normalization_into_affine(
&FixedBaseMSM::multi_scalar_mul(scalar_bits, window_size, &g_table, &t),
);
res
};
end_timer!(vp_generation_timer);
end_timer!(total_timer);

1
scripts/run_tests.sh
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@@ -3,6 +3,7 @@
# We want the code to panic if there is an integer overflow
export RUSTFLAGS="-C overflow-checks=on"
cargo test --release -p pcs --no-default-features --features=parallel -- -Zunstable-options --report-time
cargo test --release -- -Zunstable-options --report-time
cargo test --no-run --features=print-trace
cargo test --no-run --no-default-features