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Add prime-field crate

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prime-field introduces a macro to generate a prime field, in its entitrety,
de-duplicating code across minimal-ed448, embedwards25519, and secq256k1.
This commit is contained in:
Luke Parker
2025-08-28 03:36:15 -04:00
parent 85949f4b04
commit 220bcbc592
29 changed files with 833 additions and 1301 deletions
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26
crypto/frost/src/curve/ed448.rs
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@@ -2,7 +2,10 @@ use digest::Digest;
use minimal_ed448::{Scalar, Point};
pub use minimal_ed448::Ed448;
pub use ciphersuite::{group::GroupEncoding, Ciphersuite};
pub use ciphersuite::{
group::{ff::FromUniformBytes, GroupEncoding},
Ciphersuite,
};
use crate::{curve::Curve, algorithm::Hram};
@@ -18,17 +21,18 @@ pub(crate) struct Ietf8032Ed448Hram;
impl Ietf8032Ed448Hram {
#[allow(non_snake_case)]
pub(crate) fn hram(context: &[u8], R: &Point, A: &Point, m: &[u8]) -> Scalar {
Scalar::wide_reduce(
<Ed448 as Ciphersuite>::H::digest(
[
&[b"SigEd448".as_ref(), &[0, u8::try_from(context.len()).unwrap()]].concat(),
context,
&[R.to_bytes().as_ref(), A.to_bytes().as_ref(), m].concat(),
]
.concat(),
Scalar::from_uniform_bytes(
&<[u8; 114]>::try_from(
<Ed448 as Ciphersuite>::H::digest(
[
&[b"SigEd448".as_ref(), &[0, u8::try_from(context.len()).unwrap()]].concat(),
context,
&[R.to_bytes().as_ref(), A.to_bytes().as_ref(), m].concat(),
]
.concat(),
)
.as_slice(),
)
.as_ref()
.try_into()
.unwrap(),
)
}