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90bc364f9f
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.
FROST Schnorrkel
A Schnorrkel algorithm for modular-frost.
While the Schnorrkel algorithm has not been audited, the underlying FROST implementation was audited by Cypher Stack in March 2023, culminating in commit 669d2dbffc1dafb82a09d9419ea182667115df06. Any subsequent changes have not undergone auditing.