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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 a82ccadbb0
commit 2be69b23b1
10 changed files with 161 additions and 189 deletions
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5
crypto/multiexp/README.md
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@@ -12,5 +12,6 @@ culminating in commit
[669d2dbffc1dafb82a09d9419ea182667115df06](https://github.com/serai-dex/serai/tree/669d2dbffc1dafb82a09d9419ea182667115df06).
Any subsequent changes have not undergone auditing.
This library is usable under no_std, via alloc, when the default features are
disabled.
This library is usable under no-`std` and no-`alloc`. With the `alloc` feature,
the library is fully functional. Without the `alloc` feature, the `multiexp`
function is shimmed with a serial implementation.