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Add an implementation of Ed25519 FieldElements

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This commit is contained in:
Luke Parker
2022-07-10 15:20:42 -04:00
parent 854fca3806
commit 6ce506a79d
3 changed files with 203 additions and 16 deletions
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40
crypto/dalek-ff-group/src/lib.rs
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@@ -32,6 +32,8 @@ use dalek::{
use ff::{Field, PrimeField, FieldBits, PrimeFieldBits};
use group::{Group, GroupEncoding, prime::PrimeGroup};
pub mod field;
// Convert a boolean to a Choice in a *presumably* constant time manner
fn choice(value: bool) -> Choice {
let bit = value as u8;
@@ -120,11 +122,33 @@ macro_rules! math {
}
}
#[doc(hidden)]
#[macro_export]
macro_rules! from_wrapper {
($wrapper: ident, $inner: ident, $uint: ident) => {
impl From<$uint> for $wrapper {
fn from(a: $uint) -> $wrapper { Self($inner::from(a)) }
}
}
}
#[doc(hidden)]
#[macro_export]
macro_rules! from_uint {
($wrapper: ident, $inner: ident) => {
from_wrapper!($wrapper, $inner, u8);
from_wrapper!($wrapper, $inner, u16);
from_wrapper!($wrapper, $inner, u32);
from_wrapper!($wrapper, $inner, u64);
}
}
/// Wrapper around the dalek Scalar type
#[derive(Clone, Copy, PartialEq, Eq, Debug, Default)]
pub struct Scalar(pub DScalar);
deref_borrow!(Scalar, DScalar);
math!(Scalar, Scalar, Scalar);
from_uint!(Scalar, DScalar);
impl Scalar {
/// Perform wide reduction on a 64-byte array to create a Scalar without bias
@@ -170,22 +194,6 @@ impl Field for Scalar {
fn pow_vartime<S: AsRef<[u64]>>(&self, _exp: S) -> Self { unimplemented!() }
}
impl From<u8> for Scalar {
fn from(a: u8) -> Scalar { Self(DScalar::from(a)) }
}
impl From<u16> for Scalar {
fn from(a: u16) -> Scalar { Self(DScalar::from(a)) }
}
impl From<u32> for Scalar {
fn from(a: u32) -> Scalar { Self(DScalar::from(a)) }
}
impl From<u64> for Scalar {
fn from(a: u64) -> Scalar { Self(DScalar::from(a)) }
}
impl PrimeField for Scalar {
type Repr = [u8; 32];
const NUM_BITS: u32 = 253;