Make some functions const (#45)

src/keys.rs

@@ -42,7 +42,7 @@ impl_serialization_traits!(DiffieHellmanPublicKey<CipherSuite>);
 
 impl<C: CipherSuite> DiffieHellmanPublicKey<C> {
     /// Instantiates a new [`DiffieHellmanPublicKey`] key.
-    pub fn new(key: C::G) -> Self {
+    pub const fn new(key: C::G) -> Self {
         Self {
             key,
             _phantom: PhantomData,
@@ -204,7 +204,7 @@ impl<C: CipherSuite> IndividualSigningKey<C> {
     /// This can be useful for single parties owning a public key for
     /// Schnorr signatures outside of an ICE-FROST context and who would
     /// like to reshare its corresponding secret key to a set of participants.
-    pub fn from_single_key(key: <C::G as Group>::ScalarField) -> Self {
+    pub const fn from_single_key(key: <C::G as Group>::ScalarField) -> Self {
         Self { index: 1, key }
     }
 
@@ -236,7 +236,7 @@ impl_serialization_traits!(GroupVerifyingKey<CipherSuite>);
 
 impl<C: CipherSuite> GroupVerifyingKey<C> {
     /// Instantiates a new [`GroupVerifyingKey`] key.
-    pub fn new(key: C::G) -> Self {
+    pub const fn new(key: C::G) -> Self {
         Self {
             key,
             _phantom: PhantomData,

src/sign/precomputation.rs

@@ -135,7 +135,7 @@ impl<C: CipherSuite> PartialEq for CommitmentShare<C> {
 
 impl<C: CipherSuite> CommitmentShare<C> {
     /// Publish the public commitments in this [`CommitmentShare`].
-    pub fn publish(&self) -> (C::G, C::G) {
+    pub const fn publish(&self) -> (C::G, C::G) {
         (self.hiding.commit, self.binding.commit)
     }
 }

src/sign/signature.rs

@@ -78,7 +78,7 @@ impl_serialization_traits!(ThresholdSignature<CipherSuite>);
 struct BindingFactors<C: CipherSuite>(pub(crate) BTreeMap<u32, Scalar<C>>);
 
 impl<C: CipherSuite> BindingFactors<C> {
-    pub fn new() -> Self {
+    pub const fn new() -> Self {
         Self(BTreeMap::new())
     }
 }
@@ -103,7 +103,7 @@ impl<C: CipherSuite> DerefMut for BindingFactors<C> {
 pub(crate) struct PartialThresholdSignatures<C: CipherSuite>(pub(crate) BTreeMap<u32, Scalar<C>>);
 
 impl<C: CipherSuite> PartialThresholdSignatures<C> {
-    pub fn new() -> Self {
+    pub const fn new() -> Self {
         Self(BTreeMap::new())
     }
 }
@@ -128,7 +128,7 @@ impl<C: CipherSuite> DerefMut for PartialThresholdSignatures<C> {
 pub(crate) struct IndividualPublicKeys<C: CipherSuite>(pub(crate) BTreeMap<u32, C::G>);
 
 impl<C: CipherSuite> IndividualPublicKeys<C> {
-    pub fn new() -> Self {
+    pub const fn new() -> Self {
         Self(BTreeMap::new())
     }
 }