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Fixes https://github.com/serai-dex/serai/issues/33 and 
https://github.com/serai-dex/serai/issues/35. Also fixes a few potential 
panics/DoS AFAICT.
This commit is contained in:
Luke Parker
2022-07-13 02:38:29 -04:00
parent c0c8915698
commit 6cc8ce840e
13 changed files with 357 additions and 349 deletions
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26
crypto/frost/src/curve/kp256.rs
View File

@@ -1,3 +1,5 @@
use std::io::Cursor;
use rand_core::{RngCore, CryptoRng};
use sha2::{digest::Update, Digest, Sha256};
@@ -6,7 +8,7 @@ use group::{ff::Field, GroupEncoding};
use elliptic_curve::{bigint::{Encoding, U384}, hash2curve::{Expander, ExpandMsg, ExpandMsgXmd}};
use crate::{curve::{Curve, F_from_slice}, algorithm::Hram};
use crate::{curve::Curve, algorithm::Hram};
macro_rules! kp_curve {
(
@@ -58,16 +60,18 @@ macro_rules! kp_curve {
let mut modulus = vec![0; 16];
modulus.extend((Self::F::zero() - Self::F::one()).to_bytes());
let modulus = U384::from_be_slice(&modulus).wrapping_add(&U384::ONE);
F_from_slice::<Self::F>(
&U384::from_be_slice(&{
let mut bytes = [0; 48];
ExpandMsgXmd::<Sha256>::expand_message(
&[msg],
dst,
48
).unwrap().fill_bytes(&mut bytes);
bytes
}).reduce(&modulus).unwrap().to_be_bytes()[16 ..]
Self::read_F(
&mut Cursor::new(
&U384::from_be_slice(&{
let mut bytes = [0; 48];
ExpandMsgXmd::<Sha256>::expand_message(
&[msg],
dst,
48
).unwrap().fill_bytes(&mut bytes);
bytes
}).reduce(&modulus).unwrap().to_be_bytes()[16 ..]
)
).unwrap()
}
}