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Replace Ciphersuite::hash_to_F

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The prior-present `Ciphersuite::hash_to_F` was a sin. Implementations took a
DST, yet were not require to securely handle it. It was also biased towards the
requirements of `modular-frost` as `ciphersuite` was originally written all
those years ago, when `modular-frost` had needs exceeding what `ff`, `group`
satisfied.

Now, the hash is bound to produce an output which can be converted to a scalar
with `ff::FromUniformBytes`. A new `hash_to_F`, which accepts a single argument
of the value to hash (removing the potential to insecurely handle the DST by
removing the DST entirely). Due to `digest` yielding a `GenericArray`, yet
`FromUniformBytes` taking a `const usize`, the `ciphersuite` crate now defines
a `FromUniformBytes` trait taking an array (then implemented for all satisfiers
of `ff::FromUniformBytes`). In order to get the array type from the
`GenericArray`, the output of the hash, `digest` is updated to the `0.11`
release candidate which moves to `flexible-array` which solves that problem.

The existing, specific `hash_to_F` functions have been moved to `modular-frost`
as necessary.

`flexible-array` itself is patched to a fork due to
https://github.com/RustCrypto/hybrid-array/issues/131.
This commit is contained in:
Luke Parker
2025-08-29 05:04:03 -04:00
parent a4811c9a41
commit 90bc364f9f
37 changed files with 355 additions and 416 deletions
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6
crypto/dalek-ff-group/Cargo.toml
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@@ -7,7 +7,7 @@ repository = "https://github.com/serai-dex/serai/tree/develop/crypto/dalek-ff-gr
authors = ["Luke Parker <lukeparker5132@gmail.com>"]
keywords = ["curve25519", "ed25519", "ristretto", "dalek", "group"]
edition = "2021"
rust-version = "1.73"
rust-version = "1.85"
[package.metadata.docs.rs]
all-features = true
@@ -25,7 +25,7 @@ subtle = { version = "^2.4", default-features = false }
rand_core = { version = "0.6", default-features = false }
digest = { version = "0.10", default-features = false }
sha2 = { version = "0.10", default-features = false }
sha2 = { version = "0.11.0-rc.0", default-features = false }
ff = { version = "0.13", default-features = false, features = ["bits"] }
group = { version = "0.13", default-features = false }
@@ -42,5 +42,5 @@ ff-group-tests = { path = "../ff-group-tests" }
[features]
alloc = ["zeroize/alloc", "ciphersuite/alloc", "curve25519-dalek/alloc"]
std = ["alloc", "zeroize/std", "subtle/std", "rand_core/std", "digest/std", "sha2/std", "ciphersuite/std"]
std = ["alloc", "zeroize/std", "subtle/std", "rand_core/std", "digest/std", "ciphersuite/std"]
default = ["std"]