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Tweak multiexp to compile on core

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On `core`, it'll use a serial implementation of no benefit other than the fact
that when `alloc` _is_ enabled, it'll use the multi-scalar multiplication
algorithms.

`schnorr-signatures` was prior tweaked to include a shim for
`SchnorrSignature::verify` which didn't use `multiexp_vartime` yet this same
premise. Now, instead of callers writing these shims, it's within `multiexp`.
This commit is contained in:
Luke Parker
2025-09-15 22:37:59 -04:00
parent d6d96fe8ff
commit be68e27551
10 changed files with 161 additions and 189 deletions
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10
crypto/schnorr/src/lib.rs
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@@ -23,8 +23,9 @@ use ciphersuite::{
},
GroupIo,
};
use multiexp::multiexp_vartime;
#[cfg(feature = "alloc")]
use multiexp::{multiexp_vartime, BatchVerifier};
use multiexp::BatchVerifier;
/// Half-aggregation from <https://eprint.iacr.org/2021/350>.
#[cfg(feature = "aggregate")]
@@ -109,12 +110,7 @@ impl<C: GroupIo> SchnorrSignature<C> {
/// different keys/messages.
#[must_use]
pub fn verify(&self, public_key: C::G, challenge: C::F) -> bool {
let statements = self.batch_statements(public_key, challenge);
#[cfg(feature = "alloc")]
let res = multiexp_vartime(&statements);
#[cfg(not(feature = "alloc"))]
let res = statements.into_iter().map(|(scalar, point)| point * scalar).sum::<C::G>();
res.is_identity().into()
multiexp_vartime(&self.batch_statements(public_key, challenge)).is_identity().into()
}
/// Queue a signature for batch verification.