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Fix small numbers (#221)

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daxpedda
2021-07-31 16:40:59 -07:00
committed by GitHub
parent e491c1b533
commit a169d8a1c5
1 changed files with 6 additions and 3 deletions
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src/map_to_curve.rs
+6 -3
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@@ -77,11 +77,14 @@ impl GroupWithMapToCurve for p256_::ProjectivePoint {
let uniform_bytes = expand_message_xmd::<H>(input, dst, crate::group::p256::L)?; let uniform_bytes = expand_message_xmd::<H>(input, dst, crate::group::p256::L)?;
#[allow(clippy::borrow_interior_mutable_const)] #[allow(clippy::borrow_interior_mutable_const)]
let bytes = let mut bytes = BigInt::from_bytes_be(Sign::Plus, &uniform_bytes)
BigInt::from_bytes_be(Sign::Plus, &uniform_bytes).mod_floor(&crate::group::p256::R); .mod_floor(&crate::group::p256::R)
.to_bytes_be()
.1;
bytes.resize(32, 0);
Ok(p256_::Scalar::from_bytes_reduced(GenericArray::from_slice( Ok(p256_::Scalar::from_bytes_reduced(GenericArray::from_slice(
&bytes.to_bytes_be().1, &bytes,
))) )))
} }
} }