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ecdsa: add EcdsaCurve marker trait (#787)

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This trait is the intended successor to the `SignPrimitive` and
`VerifyPrimitive` traits.

Currently the only reason for a non-default impl of those traits is to
handle low-S normalization. The `EcdsaCurve` trait now not only marks
the curve as being safe for use with ECDSA, but also captures this
decision regarding low-S normalization so it doesn't have to be
expressed in code.
This commit is contained in:
Tony Arcieri
2024-01-17 19:16:17 +00:00
committed by GitHub
parent 81adf2e2fc
commit 9eda95a623
1 changed files with 9 additions and 0 deletions
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ecdsa/src/hazmat.rs
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@@ -43,6 +43,15 @@ use elliptic_curve::{FieldBytesEncoding, ScalarPrimitive};
#[cfg(any(feature = "arithmetic", feature = "digest"))]
use crate::{elliptic_curve::array::ArraySize, Signature};
/// Marker trait for elliptic curves intended for use with ECDSA.
#[cfg(feature = "arithmetic")]
pub trait EcdsaCurve: PrimeCurve {
/// Does this curve use low-S normalized signatures?
///
/// This is typically `false`. See [`Signature::normalize_s`] for more information.
const NORMALIZE_S: bool;
}
/// Try to sign the given prehashed message using ECDSA.
///
/// This trait is intended to be implemented on a type with access to the