chore: update generic-array to v1 (#143)

* update generic-array to v1

* revert displaydoc removal

* fix cargo fmt

Cargo.toml

@@ -15,7 +15,7 @@ version = "0.5.0"
 alloc = []
 danger = []
 default = ["ristretto255-ciphersuite", "dep:serde"]
-ristretto255 = ["dep:curve25519-dalek", "generic-array/more_lengths"]
+ristretto255 = ["dep:curve25519-dalek"]
 ristretto255-ciphersuite = ["ristretto255", "dep:sha2"]
 serde = ["curve25519-dalek?/serde", "generic-array/serde", "dep:serde"]
 std = ["alloc"]
@@ -33,7 +33,7 @@ elliptic-curve = { version = "0.13", features = [
   "sec1",
   "voprf",
 ] }
-generic-array = "0.14"
+generic-array = "1"
 rand_core = { version = "0.6", default-features = false }
 serde = { version = "1", default-features = false, features = [
   "derive",
@@ -43,7 +43,7 @@ subtle = { version = "2.3", default-features = false }
 zeroize = { version = "1.5", default-features = false }
 
 [dev-dependencies]
-generic-array = { version = "0.14", features = ["more_lengths"] }
+generic-array = { version = "1" }
 hex = "0.4"
 p256 = { version = "0.13", default-features = false, features = [
   "hash2curve",

src/ciphersuite.rs

@@ -12,6 +12,7 @@ use digest::core_api::BlockSizeUser;
 use digest::{FixedOutput, HashMarker, OutputSizeUser};
 use elliptic_curve::VoprfParameters;
 use generic_array::typenum::{IsLess, IsLessOrEqual, U256};
+use generic_array::ArrayLength;
 
 use crate::Group;
 
@@ -19,7 +20,7 @@ use crate::Group;
 pub trait CipherSuite
 where
     <Self::Hash as OutputSizeUser>::OutputSize:
-        IsLess<U256> + IsLessOrEqual<<Self::Hash as BlockSizeUser>::BlockSize>,
+        ArrayLength + IsLess<U256> + IsLessOrEqual<<Self::Hash as BlockSizeUser>::BlockSize>,
 {
     /// The ciphersuite identifier as dictated by
     /// <https://www.rfc-editor.org/rfc/rfc9497>
@@ -39,7 +40,7 @@ where
     T: Group,
     T::Hash: BlockSizeUser + Default + FixedOutput + HashMarker,
     <T::Hash as OutputSizeUser>::OutputSize:
-        IsLess<U256> + IsLessOrEqual<<T::Hash as BlockSizeUser>::BlockSize>,
+        ArrayLength + IsLess<U256> + IsLessOrEqual<<T::Hash as BlockSizeUser>::BlockSize>,
 {
     const ID: &'static str = T::ID;
 

src/common.rs

@@ -12,7 +12,7 @@ use core::convert::TryFrom;
 use core::ops::Add;
 
 use derive_where::derive_where;
-use digest::{Digest, Output};
+use digest::{Digest, Output, OutputSizeUser};
 use generic_array::sequence::Concat;
 use generic_array::typenum::{IsLess, Unsigned, U2, U256, U9};
 use generic_array::{ArrayLength, GenericArray};
@@ -283,7 +283,7 @@ fn compute_composites<
         .chain_update(seed_dst.i2osp_2())
         .chain_update_multi(&seed_dst.as_dst())
         .finalize();
-    let seed_len = i2osp_2_array(&seed);
+    let seed_len = i2osp_2_array::<<CS::Hash as OutputSizeUser>::OutputSize>();
 
     let mut m = CS::Group::identity_elem();
     let mut z = CS::Group::identity_elem();
@@ -442,23 +442,23 @@ pub(crate) fn server_evaluate_hash_input<CS: CipherSuite>(
             .chain_update(info.as_ref());
     }
     Ok(hash
-        .chain_update(i2osp_2(issued_element.as_ref().len()).map_err(|_| Error::Input)?)
+        .chain_update(i2osp_2(issued_element.as_slice().len()).map_err(|_| Error::Input)?)
         .chain_update(issued_element)
         .chain_update(STR_FINALIZE)
         .finalize())
 }
 
-pub(crate) struct Dst<L: ArrayLength<u8>> {
+pub(crate) struct Dst<L: ArrayLength> {
     dst_1: GenericArray<u8, L>,
     dst_2: &'static str,
 }
 
-impl<L: ArrayLength<u8>> Dst<L> {
+impl<L: ArrayLength> Dst<L> {
     pub(crate) fn new<CS, T, TL>(par_1: T, mode: Mode) -> Self
     where
         CS: CipherSuite,
         T: Into<GenericArray<u8, TL>>,
-        TL: ArrayLength<u8> + Add<U9, Output = L>,
+        TL: ArrayLength + Add<U9, Output = L>,
     {
         let par_1 = par_1.into();
         // Generates the contextString parameter as defined in
@@ -518,8 +518,6 @@ pub(crate) fn i2osp_2(input: usize) -> Result<[u8; 2], InternalError> {
         .map_err(|_| InternalError::I2osp)
 }
 
-pub(crate) fn i2osp_2_array<L: ArrayLength<u8> + IsLess<U256>>(
+pub(crate) fn i2osp_2_array<L: ArrayLength + IsLess<U256>>() -> GenericArray<u8, U2> {
-    _: &GenericArray<u8, L>,
-) -> GenericArray<u8, U2> {
     L::U16.to_be_bytes().into()
 }

src/error.rs

@@ -8,13 +8,11 @@
 
 //! Errors which are produced during an execution of the protocol
 
-use displaydoc::Display;
-
 /// [`Result`](core::result::Result) shorthand that uses [`Error`].
 pub type Result<T, E = Error> = core::result::Result<T, E>;
 
 /// Represents an error in the manipulation of internal cryptographic data
-#[derive(Clone, Copy, Debug, Display, Eq, Hash, Ord, PartialEq, PartialOrd)]
+#[derive(Clone, Copy, Debug, displaydoc::Display, Eq, Hash, Ord, PartialEq, PartialOrd)]
 pub enum Error {
     /// Size of info is longer then [`u16::MAX`].
     Info,

src/group/elliptic_curve.rs

@@ -14,7 +14,8 @@ use elliptic_curve::group::cofactor::CofactorGroup;
 use elliptic_curve::hash2curve::{ExpandMsgXmd, FromOkm, GroupDigest};
 use elliptic_curve::sec1::{FromEncodedPoint, ModulusSize, ToEncodedPoint};
 use elliptic_curve::{
-    AffinePoint, Field, FieldBytesSize, Group as _, ProjectivePoint, PublicKey, Scalar, SecretKey,
+    AffinePoint, Field, FieldBytes, FieldBytesSize, Group as _, ProjectivePoint, PublicKey, Scalar,
+    SecretKey,
 };
 use generic_array::typenum::{IsLess, IsLessOrEqual, Sum, U256};
 use generic_array::{ArrayLength, GenericArray};
@@ -31,14 +32,16 @@ where
     C: GroupDigest,
     ProjectivePoint<Self>: CofactorGroup + ToEncodedPoint<Self>,
     ScalarLen<Self>: ModulusSize,
+    ScalarLen<Self>: ArrayLength,
     AffinePoint<Self>: FromEncodedPoint<Self> + ToEncodedPoint<Self>,
     Scalar<Self>: FromOkm,
     // `VoprfClientLen`, `PoprfClientLen`, `VoprfServerLen`, `PoprfServerLen`
     ScalarLen<Self>: Add<ElemLen<Self>>,
-    Sum<ScalarLen<Self>, ElemLen<Self>>: ArrayLength<u8>,
+    Sum<ScalarLen<Self>, ElemLen<Self>>: ArrayLength,
     // `ProofLen`
     ScalarLen<Self>: Add<ScalarLen<Self>>,
-    Sum<ScalarLen<Self>, ScalarLen<Self>>: ArrayLength<u8>,
+    Sum<ScalarLen<Self>, ScalarLen<Self>>: ArrayLength,
+    ElemLen<Self>: ArrayLength,
 {
     type Elem = ProjectivePoint<Self>;
 
@@ -108,7 +111,10 @@ where
     }
 
     fn serialize_scalar(scalar: Self::Scalar) -> GenericArray<u8, Self::ScalarLen> {
-        scalar.into()
+        let bytes: FieldBytes<Self> = scalar.into();
+        let mut result = GenericArray::<u8, Self::ScalarLen>::default();
+        result.as_mut_slice().copy_from_slice(bytes.as_ref());
+        result
     }
 
     fn deserialize_scalar(scalar_bits: &[u8]) -> Result<Self::Scalar> {

src/group/mod.rs

@@ -32,10 +32,10 @@ pub trait Group
 where
     // `VoprfClientLen`, `PoprfClientLen`, `VoprfServerLen`, `PoprfServerLen`
     Self::ScalarLen: Add<Self::ElemLen>,
-    Sum<Self::ScalarLen, Self::ElemLen>: ArrayLength<u8>,
+    Sum<Self::ScalarLen, Self::ElemLen>: ArrayLength,
     // `ProofLen`
     Self::ScalarLen: Add<Self::ScalarLen>,
-    Sum<Self::ScalarLen, Self::ScalarLen>: ArrayLength<u8>,
+    Sum<Self::ScalarLen, Self::ScalarLen>: ArrayLength,
 {
     /// The type of group elements
     type Elem: ConstantTimeEq
@@ -45,7 +45,7 @@ where
         + for<'a> Mul<&'a Self::Scalar, Output = Self::Elem>;
 
     /// The byte length necessary to represent group elements
-    type ElemLen: ArrayLength<u8> + 'static;
+    type ElemLen: ArrayLength + 'static;
 
     /// The type of base field scalars
     type Scalar: ConstantTimeEq
@@ -56,7 +56,7 @@ where
         + for<'a> Sub<&'a Self::Scalar, Output = Self::Scalar>;
 
     /// The byte length necessary to represent scalars
-    type ScalarLen: ArrayLength<u8> + 'static;
+    type ScalarLen: ArrayLength + 'static;
 
     /// Transforms a password and domain separation tag (DST) into a curve point
     ///

src/poprf.rs

@@ -15,7 +15,7 @@ use core::iter::{self, Map, Repeat, Zip};
 use derive_where::derive_where;
 use digest::{Digest, Output, OutputSizeUser};
 use generic_array::typenum::Unsigned;
-use generic_array::GenericArray;
+use generic_array::{ArrayLength, GenericArray};
 use rand_core::{CryptoRng, RngCore};
 
 use crate::common::{
@@ -132,7 +132,10 @@ impl<CS: CipherSuite> PoprfClient<CS> {
         proof: &Proof<CS>,
         pk: <CS::Group as Group>::Elem,
         info: Option<&[u8]>,
-    ) -> Result<Output<CS::Hash>> {
+    ) -> Result<Output<CS::Hash>>
+    where
+        <<CS as CipherSuite>::Hash as OutputSizeUser>::OutputSize: ArrayLength,
+    {
         let clients = core::array::from_ref(self);
         let messages = core::array::from_ref(evaluation_element);
 
@@ -167,6 +170,7 @@ impl<CS: CipherSuite> PoprfClient<CS> {
         <&'a IC as IntoIterator>::IntoIter: ExactSizeIterator,
         &'a IM: 'a + IntoIterator<Item = &'a EvaluationElement<CS>>,
         <&'a IM as IntoIterator>::IntoIter: ExactSizeIterator,
+        <<CS as CipherSuite>::Hash as OutputSizeUser>::OutputSize: ArrayLength,
     {
         let unblinded_elements = poprf_unblind(clients, messages, pk, proof, info)?;
 
@@ -672,7 +676,7 @@ type FinalizeAfterUnblindResult<'a, CS, IE, II> = Map<
     Zip<Zip<IE, II>, Repeat<&'a [u8]>>,
     fn(
         ((<<CS as CipherSuite>::Group as Group>::Elem, &[u8]), &[u8]),
-    ) -> Result<GenericArray<u8, <<CS as CipherSuite>::Hash as OutputSizeUser>::OutputSize>>,
+    ) -> Result<Output<<CS as CipherSuite>::Hash>>,
 >;
 
 /// Can only fail with [`Error::Batch`] and returned values can only fail with
@@ -686,7 +690,10 @@ fn finalize_after_unblind<
     unblinded_elements: IE,
     inputs: II,
     info: Option<&'a [u8]>,
-) -> Result<FinalizeAfterUnblindResult<'a, CS, IE, II>> {
+) -> Result<FinalizeAfterUnblindResult<'a, CS, IE, II>>
+where
+    <<CS as CipherSuite>::Hash as OutputSizeUser>::OutputSize: ArrayLength,
+{
     if unblinded_elements.len() != inputs.len() {
         return Err(Error::Batch);
     }