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Minimize use of lazy_static in ed448

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Increases usage of const values along with overall Field impl sanity 
with regards to the crypto_bigint backend.
This commit is contained in:
Luke Parker
2022-08-31 03:33:19 -04:00
parent a59bbe7635
commit 73566e756d
6 changed files with 100 additions and 112 deletions
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43
crypto/ed448/src/field.rs
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@@ -1,10 +1,6 @@
use core::ops::Div;
use lazy_static::lazy_static;
use zeroize::Zeroize;
use crypto_bigint::{NonZero, U512, U1024};
use crypto_bigint::{U512, U1024};
use crate::field;
@@ -12,28 +8,27 @@ use crate::field;
pub struct FieldElement(pub(crate) U512);
// 2**448 - 2**224 - 1
lazy_static! {
pub static ref MODULUS: FieldElement = FieldElement(U512::from_be_hex(concat!(
"00000000000000",
"00",
"fffffffffffffffffffffffffffffffffffffffffffffffffffffffe",
"ffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
)));
static ref WIDE_MODULUS: U1024 = {
let res = U1024::from((U512::ZERO, MODULUS.0));
debug_assert_eq!(MODULUS.0.to_le_bytes()[..], res.to_le_bytes()[.. 64]);
res
};
}
pub const MODULUS: FieldElement = FieldElement(U512::from_be_hex(concat!(
"00000000000000",
"00",
"fffffffffffffffffffffffffffffffffffffffffffffffffffffffe",
"ffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
)));
const WIDE_MODULUS: U1024 = U1024::from_be_hex(concat!(
"0000000000000000000000000000000000000000000000000000000000000000",
"0000000000000000000000000000000000000000000000000000000000000000",
"00000000000000",
"00",
"fffffffffffffffffffffffffffffffffffffffffffffffffffffffe",
"ffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
));
pub(crate) const Q_4: FieldElement =
FieldElement(MODULUS.0.saturating_add(&U512::ONE).wrapping_div(&U512::from_u8(4)));
field!(FieldElement, MODULUS, WIDE_MODULUS, 448);
lazy_static! {
pub(crate) static ref Q_4: FieldElement = FieldElement(
MODULUS.0.saturating_add(&U512::ONE).div(NonZero::new(TWO.0.saturating_add(&TWO.0)).unwrap())
);
}
#[test]
fn repr() {
assert_eq!(FieldElement::from_repr(FieldElement::one().to_repr()).unwrap(), FieldElement::one());