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Merging Version 09 changes into main (#60)

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* Syncing new test vectors and base mode

* Working set of test vectors for VOPRF mode

* Adding POPRF

* POPRF test vectors in sync

* Address review (#59)

Co-authored-by: daxpedda <[email protected]>
This commit is contained in:
Kevin Lewi
2022-02-13 04:00:11 -08:00
committed by GitHub
co-authored by daxpedda
parent 9eee936140
commit f8e0600b22
15 changed files with 3722 additions and 2254 deletions
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src/group/ristretto.rs
+6 -14
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@@ -12,14 +12,12 @@ use curve25519_dalek::traits::Identity;
use digest::core_api::BlockSizeUser;
use digest::OutputSizeUser;
use elliptic_curve::hash2curve::{ExpandMsg, ExpandMsgXmd, Expander};
use generic_array::sequence::Concat;
use generic_array::typenum::{IsLess, IsLessOrEqual, U256, U32, U64};
use generic_array::GenericArray;
use rand_core::{CryptoRng, RngCore};
use subtle::ConstantTimeEq;
use super::{Group, STR_HASH_TO_GROUP, STR_HASH_TO_SCALAR};
use crate::voprf::{self, Mode};
use super::Group;
use crate::{CipherSuite, Error, InternalError, Result};
/// [`Group`] implementation for Ristretto255.
@@ -52,17 +50,14 @@ impl Group for Ristretto255 {
// https://www.ietf.org/archive/id/draft-irtf-cfrg-hash-to-curve-10.txt
fn hash_to_curve<CS: CipherSuite>(
input: &[&[u8]],
mode: Mode,
dst: &[u8],
) -> Result<Self::Elem, InternalError>
where
<CS::Hash as OutputSizeUser>::OutputSize:
IsLess<U256> + IsLessOrEqual<<CS::Hash as BlockSizeUser>::BlockSize>,
{
let dst =
GenericArray::from(STR_HASH_TO_GROUP).concat(voprf::get_context_string::<Self>(mode));
let mut uniform_bytes = GenericArray::<_, U64>::default();
ExpandMsgXmd::<CS::Hash>::expand_message(input, &dst, 64)
ExpandMsgXmd::<CS::Hash>::expand_message(input, dst, 64)
.map_err(|_| InternalError::Input)?
.fill_bytes(&mut uniform_bytes);
@@ -71,19 +66,16 @@ impl Group for Ristretto255 {
// Implements the `HashToScalar()` function from
// https://www.ietf.org/archive/id/draft-irtf-cfrg-voprf-07.html#section-4.1
fn hash_to_scalar<'a, CS: CipherSuite>(
fn hash_to_scalar<CS: CipherSuite>(
input: &[&[u8]],
mode: Mode,
dst: &[u8],
) -> Result<Self::Scalar, InternalError>
where
<CS::Hash as OutputSizeUser>::OutputSize:
IsLess<U256> + IsLessOrEqual<<CS::Hash as BlockSizeUser>::BlockSize>,
{
let dst =
GenericArray::from(STR_HASH_TO_SCALAR).concat(voprf::get_context_string::<Self>(mode));
let mut uniform_bytes = GenericArray::<_, U64>::default();
ExpandMsgXmd::<CS::Hash>::expand_message(input, &dst, 64)
ExpandMsgXmd::<CS::Hash>::expand_message(input, dst, 64)
.map_err(|_| InternalError::Input)?
.fill_bytes(&mut uniform_bytes);