zecfoundation
/
frost
mirror of https://github.com/ZcashFoundation/frost.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Tweaks to publish frost-ed25519 (#270) 

* prep ed25519 for release

* Remove dependency on frost-ristretto, version frost-core

* Use curve25519-dalek rand_core feature
This commit is contained in:
Deirdre Connolly 2023-03-09 12:45:55 -05:00 committed by GitHub
parent d764fec4e5
commit 87097bb6dc
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 51 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
frost-ed25519/Cargo.toml
View File

@ -15,16 +15,15 @@ readme = "README.md"
license = "MIT OR Apache-2.0"
repository = "https://github.com/ZcashFoundation/frost"
categories = ["cryptography"]
keywords = ["cryptography", "crypto", "ristretto", "threshold", "signature"]
description = "A Schnorr signature scheme over the prime-order Ristretto group that supports FROST ."
keywords = ["cryptography", "crypto", "ed25519", "threshold", "signature"]
description = "A Schnorr signature scheme over Ed25519 that supports FROST."
[package.metadata.docs.rs]
features = ["nightly"]
[dependencies]
curve25519-dalek = { version = "=4.0.0-rc.1", features = ["serde"] }
frost-core = { path = "../frost-core", features = ["test-impl"] }
frost-ristretto255 = { path = "../frost-ristretto255" }
curve25519-dalek = { version = "=4.0.0-rc.1", features = ["serde", "rand_core"] }
frost-core = { path = "../frost-core", version = "0.1.0", features = ["test-impl"] }
rand_core = "0.6"
sha2 = "0.10.2"

50
frost-ed25519/src/lib.rs
View File

@ -11,7 +11,7 @@ use curve25519_dalek::{
use rand_core::{CryptoRng, RngCore};
use sha2::{Digest, Sha512};
use frost_core::{frost, Ciphersuite, Field, Group, GroupError};
use frost_core::{frost, Ciphersuite, Field, FieldError, Group, GroupError};
#[cfg(test)]
mod tests;
@ -20,7 +20,51 @@ mod tests;
pub type Error = frost_core::Error<Ed25519Sha512>;
/// An implementation of the FROST(Ed25519, SHA-512) ciphersuite scalar field.
pub type Ed25519ScalarField = frost_ristretto255::RistrettoScalarField;
#[derive(Clone, Copy)]
pub struct Ed25519ScalarField;
impl Field for Ed25519ScalarField {
type Scalar = Scalar;
type Serialization = [u8; 32];
fn zero() -> Self::Scalar {
Scalar::ZERO
}
fn one() -> Self::Scalar {
Scalar::ONE
}
fn invert(scalar: &Self::Scalar) -> Result<Self::Scalar, FieldError> {
// [`curve25519_dalek::scalar::Scalar`]'s Eq/PartialEq does a constant-time comparison using
// `ConstantTimeEq`
if *scalar == <Self as Field>::zero() {
Err(FieldError::InvalidZeroScalar)
} else {
Ok(scalar.invert())
}
}
fn random<R: RngCore + CryptoRng>(rng: &mut R) -> Self::Scalar {
Scalar::random(rng)
}
fn serialize(scalar: &Self::Scalar) -> Self::Serialization {
scalar.to_bytes()
}
fn deserialize(buf: &Self::Serialization) -> Result<Self::Scalar, FieldError> {
match Scalar::from_canonical_bytes(*buf).into() {
Some(s) => Ok(s),
None => Err(FieldError::MalformedScalar),
}
}
fn little_endian_serialize(scalar: &Self::Scalar) -> Self::Serialization {
Self::serialize(scalar)
}
}
#[derive(Clone, Copy, PartialEq, Eq)]
/// An implementation of the FROST(Ed25519, SHA-512) ciphersuite group.
@ -92,7 +136,7 @@ fn hash_to_scalar(inputs: &[&[u8]]) -> Scalar {
Scalar::from_bytes_mod_order_wide(&output)
}
/// Context string 'FROST-RISTRETTO255-SHA512-v5' from the ciphersuite in the [spec]
/// Context string 'FROST-ED25519-SHA512-v11' from the ciphersuite in the [spec]
///
/// [spec]: https://www.ietf.org/archive/id/draft-irtf-cfrg-frost-11.html#section-6.1-1
const CONTEXT_STRING: &str = "FROST-ED25519-SHA512-v11";