vexahub/voprf-vx
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Document all Errors (#55)

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* Document all `Error`s

* Fix inaccuracies
This commit is contained in:
daxpedda
2022-01-24 20:55:02 -08:00
committed by GitHub
parent 16e072dcd4
commit b01b8ed409
9 changed files with 249 additions and 125 deletions
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src/group/ristretto.rs
+14 -8
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@@ -19,7 +19,7 @@ use rand_core::{CryptoRng, RngCore};
use super::{Group, STR_HASH_TO_GROUP, STR_HASH_TO_SCALAR};
use crate::voprf::{self, Mode};
use crate::{CipherSuite, Error, Result};
use crate::{CipherSuite, Error, InternalError, Result};
/// [`Group`] implementation for Ristretto255.
pub struct Ristretto255;
@@ -46,7 +46,10 @@ impl Group for Ristretto255 {
// Implements the `hash_to_ristretto255()` function from
// https://www.ietf.org/archive/id/draft-irtf-cfrg-hash-to-curve-10.txt
fn hash_to_curve<CS: CipherSuite>(msg: &[&[u8]], mode: Mode) -> Result<Self::Elem>
fn hash_to_curve<CS: CipherSuite>(
input: &[&[u8]],
mode: Mode,
) -> Result<Self::Elem, InternalError>
where
<CS::Hash as OutputSizeUser>::OutputSize:
IsLess<U256> + IsLessOrEqual<<CS::Hash as BlockSizeUser>::BlockSize>,
@@ -55,8 +58,8 @@ impl Group for Ristretto255 {
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(msg, &dst, 64)
.map_err(|_| Error::PointError)?
ExpandMsgXmd::<CS::Hash>::expand_message(input, &dst, 64)
.map_err(|_| InternalError::Input)?
.fill_bytes(&mut uniform_bytes);
Ok(RistrettoPoint::from_uniform_bytes(&uniform_bytes.into()))
@@ -64,7 +67,10 @@ 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>(input: &[&[u8]], mode: Mode) -> Result<Self::Scalar>
fn hash_to_scalar<'a, CS: CipherSuite>(
input: &[&[u8]],
mode: Mode,
) -> Result<Self::Scalar, InternalError>
where
<CS::Hash as OutputSizeUser>::OutputSize:
IsLess<U256> + IsLessOrEqual<<CS::Hash as BlockSizeUser>::BlockSize>,
@@ -74,7 +80,7 @@ impl Group for Ristretto255 {
let mut uniform_bytes = GenericArray::<_, U64>::default();
ExpandMsgXmd::<CS::Hash>::expand_message(input, &dst, 64)
.map_err(|_| Error::PointError)?
.map_err(|_| InternalError::Input)?
.fill_bytes(&mut uniform_bytes);
Ok(Scalar::from_bytes_mod_order_wide(&uniform_bytes.into()))
@@ -97,7 +103,7 @@ impl Group for Ristretto255 {
CompressedRistretto::from_slice(element_bits)
.decompress()
.filter(|point| point != &RistrettoPoint::identity())
.ok_or(Error::PointError)
.ok_or(Error::Deserialization)
}
fn random_scalar<R: RngCore + CryptoRng>(rng: &mut R) -> Self::Scalar {
@@ -130,6 +136,6 @@ impl Group for Ristretto255 {
fn deserialize_scalar(scalar_bits: &GenericArray<u8, Self::ScalarLen>) -> Result<Self::Scalar> {
Scalar::from_canonical_bytes((*scalar_bits).into())
.filter(|scalar| scalar != &Scalar::zero())
.ok_or(Error::ScalarError)
.ok_or(Error::Deserialization)
}
}