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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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11
crypto/multiexp/Cargo.toml
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@@ -17,11 +17,7 @@ rustdoc-args = ["--cfg", "docsrs"]
workspace = true
[dependencies]
rustversion = "1"
std-shims = { path = "../../common/std-shims", version = "0.1.1", default-features = false, features = ["alloc"] }
zeroize = { version = "^1.5", default-features = false, features = ["zeroize_derive", "alloc"] }
zeroize = { version = "^1.5", default-features = false, features = ["zeroize_derive"] }
ff = { version = "0.13", default-features = false, features = ["bits"] }
group = { version = "0.13", default-features = false }
@@ -35,8 +31,9 @@ k256 = { version = "^0.13.1", default-features = false, features = ["arithmetic"
dalek-ff-group = { path = "../dalek-ff-group" }
[features]
std = ["std-shims/std", "zeroize/std", "ff/std", "rand_core?/std"]
alloc = ["zeroize/alloc"]
std = ["alloc", "zeroize/std", "ff/std", "rand_core?/std"]
batch = ["rand_core"]
batch = ["alloc", "rand_core"]
default = ["std"]