absolutebi/serai
1
0
Fork 0
mirror of https://github.com/serai-dex/serai.git synced 2025-12-09 20:59:23 +00:00
Code Issues Packages Projects Releases Wiki Activity

Replace Ciphersuite::hash_to_F

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

9
crypto/frost/Cargo.toml
View File

@@ -7,7 +7,7 @@ repository = "https://github.com/serai-dex/serai/tree/develop/crypto/frost"
authors = ["Luke Parker <lukeparker5132@gmail.com>"]
keywords = ["frost", "multisig", "threshold"]
edition = "2021"
rust-version = "1.79"
rust-version = "1.85"
[package.metadata.docs.rs]
all-features = true
@@ -27,13 +27,14 @@ subtle = { version = "^2.4", default-features = false, features = ["std"] }
hex = { version = "0.4", default-features = false, features = ["std"], optional = true }
digest = { version = "0.10", default-features = false, features = ["std"] }
transcript = { package = "flexible-transcript", path = "../transcript", version = "^0.3.2", default-features = false, features = ["std", "recommended"] }
dalek-ff-group = { path = "../dalek-ff-group", version = "0.4", default-features = false, features = ["std"], optional = true }
minimal-ed448 = { path = "../ed448", version = "0.4", default-features = false, features = ["std"], optional = true }
ciphersuite = { path = "../ciphersuite", version = "^0.4.1", default-features = false, features = ["std"] }
sha2 = { version = "0.10.0", default-features = false, optional = true }
elliptic-curve = { version = "0.13", default-features = false, features = ["hash2curve"], optional = true }
ciphersuite-kp256 = { path = "../ciphersuite/kp256", version = "0.4", default-features = false, features = ["std"], optional = true }
multiexp = { path = "../multiexp", version = "0.4", default-features = false, features = ["std", "batch"] }
@@ -56,8 +57,8 @@ dkg-dealer = { path = "../dkg/dealer", default-features = false, features = ["st
ed25519 = ["dalek-ff-group"]
ristretto = ["dalek-ff-group"]
secp256k1 = ["ciphersuite-kp256"]
p256 = ["ciphersuite-kp256"]
secp256k1 = ["sha2", "elliptic-curve", "ciphersuite-kp256"]
p256 = ["sha2", "elliptic-curve", "ciphersuite-kp256"]
ed448 = ["minimal-ed448"]