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Big-endian secq256k1 scalars

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Also restores the prior, safer, Encryption::register function.
This commit is contained in:
Luke Parker
2024-08-15 15:32:32 -04:00
parent 35c54da756
commit 1f093cfbc6
4 changed files with 32 additions and 20 deletions
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3
crypto/evrf/secq256k1/README.md
View File

@@ -2,5 +2,4 @@
An implementation of the curve secp256k1 cycles with.
Scalars are encoded as little-endian and field elements are encoded as
big-endian.
Scalars and field elements are encoded in their big-endian formats.

10
crypto/evrf/secq256k1/src/backend.rs
View File

@@ -183,7 +183,7 @@ macro_rules! field {
fn random(mut rng: impl RngCore) -> Self {
let mut bytes = [0; 64];
rng.fill_bytes(&mut bytes);
$FieldName(Residue::new(&reduce(U512::from_le_slice(bytes.as_ref()))))
$FieldName(Residue::new(&reduce(U512::from_be_slice(bytes.as_ref()))))
}
fn square(&self) -> Self {
@@ -230,12 +230,12 @@ macro_rules! field {
const DELTA: Self = $FieldName(Residue::new(&U256::from_be_hex($DELTA)));
fn from_repr(bytes: Self::Repr) -> CtOption<Self> {
let res = U256::from_le_slice(&bytes);
let res = U256::from_be_slice(&bytes);
CtOption::new($FieldName(Residue::new(&res)), res.ct_lt(&$MODULUS))
}
fn to_repr(&self) -> Self::Repr {
let mut repr = [0; 32];
repr.copy_from_slice(&self.0.retrieve().to_le_bytes());
repr.copy_from_slice(&self.0.retrieve().to_be_bytes());
repr
}
@@ -248,7 +248,9 @@ macro_rules! field {
type ReprBits = [u8; 32];
fn to_le_bits(&self) -> FieldBits<Self::ReprBits> {
self.to_repr().into()
let mut repr = [0; 32];
repr.copy_from_slice(&self.0.retrieve().to_le_bytes());
repr.into()
}
fn char_le_bits() -> FieldBits<Self::ReprBits> {