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Improve Field::pow API and impl

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Renamed to Field::pow_vartime to indicate it is still variable time with
respect to the exponent.
This commit is contained in:
Jack Grigg
2019-05-15 11:24:00 +01:00
parent e88e2a9dc2
commit 1c9f5742fa
15 changed files with 75 additions and 72 deletions
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12
bellman/src/domain.rs
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@@ -106,7 +106,7 @@ impl<E: ScalarEngine, G: Group<E>> EvaluationDomain<E, G> {
worker.scope(self.coeffs.len(), |scope, chunk| {
for (i, v) in self.coeffs.chunks_mut(chunk).enumerate() {
scope.spawn(move |_scope| {
let mut u = g.pow(&[(i * chunk) as u64]);
let mut u = g.pow_vartime(&[(i * chunk) as u64]);
for v in v.iter_mut() {
v.group_mul_assign(&u);
u.mul_assign(&g);
@@ -131,7 +131,7 @@ impl<E: ScalarEngine, G: Group<E>> EvaluationDomain<E, G> {
/// This evaluates t(tau) for this domain, which is
/// tau^m - 1 for these radix-2 domains.
pub fn z(&self, tau: &E::Fr) -> E::Fr {
let mut tmp = tau.pow(&[self.coeffs.len() as u64]);
let mut tmp = tau.pow_vartime(&[self.coeffs.len() as u64]);
tmp.sub_assign(&E::Fr::one());
tmp
@@ -294,7 +294,7 @@ fn serial_fft<E: ScalarEngine, T: Group<E>>(a: &mut [T], omega: &E::Fr, log_n: u
let mut m = 1;
for _ in 0..log_n {
let w_m = omega.pow(&[u64::from(n / (2 * m))]);
let w_m = omega.pow_vartime(&[u64::from(n / (2 * m))]);
let mut k = 0;
while k < n {
@@ -328,7 +328,7 @@ fn parallel_fft<E: ScalarEngine, T: Group<E>>(
let num_cpus = 1 << log_cpus;
let log_new_n = log_n - log_cpus;
let mut tmp = vec![vec![T::group_zero(); 1 << log_new_n]; num_cpus];
let new_omega = omega.pow(&[num_cpus as u64]);
let new_omega = omega.pow_vartime(&[num_cpus as u64]);
worker.scope(0, |scope, _| {
let a = &*a;
@@ -336,8 +336,8 @@ fn parallel_fft<E: ScalarEngine, T: Group<E>>(
for (j, tmp) in tmp.iter_mut().enumerate() {
scope.spawn(move |_scope| {
// Shuffle into a sub-FFT
let omega_j = omega.pow(&[j as u64]);
let omega_step = omega.pow(&[(j as u64) << log_new_n]);
let omega_j = omega.pow_vartime(&[j as u64]);
let omega_step = omega.pow_vartime(&[(j as u64) << log_new_n]);
let mut elt = E::Fr::one();
for (i, tmp) in tmp.iter_mut().enumerate() {