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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`.
Schnorr Signatures
A challenge (and therefore HRAm) agnostic Schnorr signature library. This is intended to be used as a primitive by a variety of crates relying on Schnorr signatures, voiding the need to constantly define a Schnorr signature struct with associated functions.
This library provides signatures of the R, s form. Batch verification is
supported via the multiexp crate. Half-aggregation, as defined in
https://eprint.iacr.org/2021/350, is also supported.
This library was audited by Cypher Stack in March 2023, culminating in commit 669d2dbffc1dafb82a09d9419ea182667115df06. Any subsequent changes have not undergone auditing.
This library is usable under no_std, via alloc, when the default features are disabled.