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Downstream the eVRF libraries from FCMP++

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Also adds no-std support to secq256k1 and embedwards25519.
This commit is contained in:
Luke Parker
2025-01-29 22:29:40 -05:00
parent 19422de231
commit 2bc880e372
35 changed files with 456 additions and 340 deletions
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21
crypto/evrf/secq256k1/Cargo.toml
View File

@@ -17,20 +17,22 @@ rustdoc-args = ["--cfg", "docsrs"]
rustversion = "1"
hex-literal = { version = "0.4", default-features = false }
rand_core = { version = "0.6", default-features = false, features = ["std"] }
std-shims = { version = "0.1", path = "../../../common/std-shims", default-features = false, optional = true }
zeroize = { version = "^1.5", default-features = false, features = ["std", "zeroize_derive"] }
subtle = { version = "^2.4", default-features = false, features = ["std"] }
rand_core = { version = "0.6", default-features = false }
zeroize = { version = "^1.5", default-features = false, features = ["zeroize_derive"] }
subtle = { version = "^2.4", default-features = false }
generic-array = { version = "0.14", default-features = false }
crypto-bigint = { version = "0.5", default-features = false, features = ["zeroize"] }
k256 = { version = "0.13", default-features = false, features = ["arithmetic"] }
blake2 = { version = "0.10", default-features = false, features = ["std"] }
ciphersuite = { path = "../../ciphersuite", version = "0.4", default-features = false, features = ["std"] }
ec-divisors = { path = "../divisors" }
generalized-bulletproofs-ec-gadgets = { path = "../ec-gadgets" }
blake2 = { version = "0.10", default-features = false }
ciphersuite = { path = "../../ciphersuite", version = "0.4", default-features = false }
ec-divisors = { path = "../divisors", default-features = false }
generalized-bulletproofs-ec-gadgets = { path = "../ec-gadgets", default-features = false }
[dev-dependencies]
hex = "0.4"
@@ -38,3 +40,8 @@ hex = "0.4"
rand_core = { version = "0.6", features = ["std"] }
ff-group-tests = { path = "../../ff-group-tests" }
[features]
alloc = ["std-shims", "zeroize/alloc", "ciphersuite/alloc"]
std = ["std-shims/std", "rand_core/std", "zeroize/std", "subtle/std", "blake2/std", "ciphersuite/std", "ec-divisors/std", "generalized-bulletproofs-ec-gadgets/std"]
default = ["std"]

23
crypto/evrf/secq256k1/src/lib.rs
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@@ -1,5 +1,9 @@
#![cfg_attr(docsrs, feature(doc_auto_cfg))]
#![doc = include_str!("../README.md")]
#![cfg_attr(not(feature = "std"), no_std)]
#[cfg(any(feature = "alloc", feature = "std"))]
use std_shims::io::{self, Read};
use generic_array::typenum::{Sum, Diff, Quot, U, U1, U2};
use ciphersuite::group::{ff::PrimeField, Group};
@@ -33,10 +37,29 @@ impl ciphersuite::Ciphersuite for Secq256k1 {
Point::generator()
}
fn reduce_512(scalar: [u8; 64]) -> Self::F {
Scalar::wide_reduce(scalar)
}
fn hash_to_F(dst: &[u8], data: &[u8]) -> Self::F {
use blake2::Digest;
Scalar::wide_reduce(Self::H::digest([dst, data].concat()).as_slice().try_into().unwrap())
}
// We override the provided impl, which compares against the reserialization, because
// we already require canonicity
#[cfg(any(feature = "alloc", feature = "std"))]
#[allow(non_snake_case)]
fn read_G<R: Read>(reader: &mut R) -> io::Result<Self::G> {
use ciphersuite::group::GroupEncoding;
let mut encoding = <Self::G as GroupEncoding>::Repr::default();
reader.read_exact(encoding.as_mut())?;
let point = Option::<Self::G>::from(Self::G::from_bytes(&encoding))
.ok_or_else(|| io::Error::new(io::ErrorKind::Other, "invalid point"))?;
Ok(point)
}
}
impl generalized_bulletproofs_ec_gadgets::DiscreteLogParameters for Secq256k1 {