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This commit is contained in:
Jean-Philippe Bossuat
2025-01-03 22:06:06 +01:00
parent e23ee338c8
commit 66a7513987
15 changed files with 505 additions and 176 deletions
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20
math/src/modulus/impl_u64/montgomery.rs
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@@ -2,7 +2,7 @@
use crate::modulus::ReduceOnce;
use crate::modulus::montgomery::{MontgomeryPrecomp, Montgomery};
use crate::modulus::barrett::BarrettPrecomp;
use crate::modulus::{REDUCEMOD, NONE, ONCE, TWICE, FOURTIMES, BARRETT, BARRETTLAZY};
use crate::modulus::{REDUCEMOD, ONCE};
extern crate test;
/// MontgomeryPrecomp is a set of methods implemented for MontgomeryPrecomp<u64>
@@ -65,15 +65,7 @@ impl MontgomeryPrecomp<u64>{
/// - FULL: maps x to x mod q using Barrett reduction.
#[inline(always)]
pub fn reduce_assign<const REDUCE:REDUCEMOD>(&self, x: &mut u64){
match REDUCE {
NONE =>{},
ONCE =>{x.reduce_once_assign(self.q)},
TWICE=>{x.reduce_once_assign(self.two_q)},
FOURTIMES =>{x.reduce_once_assign(self.four_q)},
BARRETT =>{self.barrett.reduce_assign(x)},
BARRETTLAZY =>{self.barrett.reduce_lazy_assign(x)},
_ => unreachable!("invalid REDUCE argument")
}
self.barrett.reduce_assign::<REDUCE>(x);
}
/// Returns lhs * 2^64 mod q as a Montgomery<u64>.
@@ -137,7 +129,7 @@ impl MontgomeryPrecomp<u64>{
#[inline(always)]
pub fn add_internal(&self, lhs: Montgomery<u64>, rhs: Montgomery<u64>) -> Montgomery<u64>{
self.barrett.reduce(rhs + lhs)
rhs + lhs
}
/// Assigns lhs + rhs to rhs.
@@ -153,12 +145,6 @@ impl MontgomeryPrecomp<u64>{
rhs.reduce_once_assign(self.q);
}
/// Returns lhs mod q in range [0, 2q-1].
#[inline(always)]
pub fn reduce_lazy_assign(&self, lhs: &mut u64){
self.barrett.reduce_lazy_assign(lhs)
}
/// Returns (x^exponent) * 2^64 mod q.
#[inline(always)]
pub fn pow(&self, x: Montgomery<u64>, exponent:u64) -> Montgomery<u64>{