absolutebi/serai
1
0
Fork 0
mirror of https://github.com/serai-dex/serai.git synced 2025-12-08 12:19:24 +00:00
Code Issues Packages Projects Releases Wiki Activity

Move the entirety of ed448 to Residue, offering a further 2-4x speedup

Browse Source
This commit is contained in:
Luke Parker
2023-04-19 04:02:59 -04:00
parent 334873b6a5
commit ff2febe5aa
4 changed files with 82 additions and 87 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
crypto/ed448/src/field.rs
View File

@@ -1,10 +1,9 @@
use zeroize::Zeroize;
use zeroize::{DefaultIsZeroes, Zeroize};
use crypto_bigint::{U512, U1024};
/// Ed448 field element.
#[derive(Clone, Copy, PartialEq, Eq, Default, Debug, Zeroize)]
pub struct FieldElement(pub(crate) U512);
use crypto_bigint::{
U512, U1024,
modular::constant_mod::{ResidueParams, Residue},
};
const MODULUS_PADDED_STR: &str = concat!(
"00000000000000",
@@ -13,18 +12,27 @@ const MODULUS_PADDED_STR: &str = concat!(
"ffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
);
impl_modulus!(FieldModulus, U512, MODULUS_PADDED_STR);
pub(crate) type ResidueType = Residue<FieldModulus, { FieldModulus::LIMBS }>;
/// Ed448 field element.
#[derive(Clone, Copy, PartialEq, Eq, Default, Debug)]
pub struct FieldElement(pub(crate) ResidueType);
impl DefaultIsZeroes for FieldElement {}
const MODULUS_STR: &str = concat!(
"fffffffffffffffffffffffffffffffffffffffffffffffffffffffe",
"ffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
);
// 2**448 - 2**224 - 1
pub(crate) const MODULUS: FieldElement = FieldElement(U512::from_be_hex(concat!(
pub(crate) const MODULUS: U512 = U512::from_be_hex(concat!(
"00000000000000",
"00",
"fffffffffffffffffffffffffffffffffffffffffffffffffffffffe",
"ffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
)));
));
const WIDE_MODULUS: U1024 = U1024::from_be_hex(concat!(
"0000000000000000000000000000000000000000000000000000000000000000",
@@ -35,25 +43,18 @@ const WIDE_MODULUS: U1024 = U1024::from_be_hex(concat!(
"ffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
));
pub(crate) const Q_4: FieldElement =
FieldElement(MODULUS.0.saturating_add(&U512::ONE).wrapping_div(&U512::from_u8(4)));
pub(crate) const Q_4: FieldElement = FieldElement(ResidueType::new(
&MODULUS.saturating_add(&U512::ONE).wrapping_div(&U512::from_u8(4)),
));
field!(
FieldElement,
MODULUS_PADDED_STR,
ResidueType,
MODULUS_STR,
MODULUS,
WIDE_MODULUS,
448,
concat!(
"00000000000000000000000000000000000000000000000000000080ffffffff",
"ffffffffffffffffffffffffffffffffffffffffffffff7f0000000000000000",
),
7,
concat!(
"fefffffffffffffffffffffffffffffffffffffffffffffffffffffffeffffff",
"ffffffffffffffffffffffffffffffffffffffffffffffff0000000000000000",
),
concat!(
"3100000000000000000000000000000000000000000000000000000000000000",
"0000000000000000000000000000000000000000000000000000000000000000",