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Change AVX2 backend to use width-8 tables

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This commit is contained in:
Henry de Valence 2018-04-05 16:20:47 -07:00
parent 62d43752df
commit 6b768c2a1a
3 changed files with 3392 additions and 75 deletions
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3450
src/backend/avx2/constants.rs
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15
src/backend/avx2/edwards.rs
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@ -22,7 +22,7 @@ use subtle::ConditionallyAssignable;
use subtle::Choice;
use edwards;
use scalar_mul::window::{LookupTable, NafLookupTable5};
use scalar_mul::window::{LookupTable, NafLookupTable5, NafLookupTable8};
use traits::Identity;
@ -307,6 +307,19 @@ impl<'a> From<&'a edwards::EdwardsPoint> for NafLookupTable5<CachedPoint> {
}
}
impl<'a> From<&'a edwards::EdwardsPoint> for NafLookupTable8<CachedPoint> {
fn from(point: &'a edwards::EdwardsPoint) -> Self {
let A = ExtendedPoint::from(*point);
let mut Ai = [CachedPoint::from(A); 64];
let A2 = A.double();
for i in 0..63 {
Ai[i + 1] = (&A2 + &Ai[i]).into();
}
// Now Ai = [A, 3A, 5A, 7A, 9A, 11A, 13A, 15A, ..., 127A]
NafLookupTable8(Ai)
}
}
#[cfg(test)]
mod test {
use super::*;

2
src/backend/avx2/scalar_mul/vartime_double_base.rs
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@ -19,7 +19,7 @@ use backend::avx2::constants::BASEPOINT_ODD_LOOKUP_TABLE;
/// Compute \\(aA + bB\\) in variable time, where \\(B\\) is the Ed25519 basepoint.
pub fn mul(a: &Scalar, A: &EdwardsPoint, b: &Scalar) -> EdwardsPoint {
let a_naf = a.non_adjacent_form(5);
let b_naf = b.non_adjacent_form(5);
let b_naf = b.non_adjacent_form(8);
// Find starting index
let mut i: usize = 255;