ZcashFoundation · mergify · Sep 21, 2023 · Sep 18, 2023
diff --git a/frost-core/src/frost.rs b/frost-core/src/frost.rs
@@ -212,6 +212,7 @@ fn derive_interpolating_value<C: Ciphersuite>(
 /// each signing party
 #[derive(Clone, Debug, PartialEq, Eq, Getters)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(deny_unknown_fields))]
 pub struct SigningPackage<C: Ciphersuite> {
     /// The set of commitments participants published in the first round of the
@@ -309,7 +310,7 @@ where
 #[cfg(feature = "serialization")]
 impl<C> SigningPackage<C>
 where
-    C: Ciphersuite + serde::Serialize + for<'de> serde::Deserialize<'de>,
+    C: Ciphersuite,
 {
     /// Serialize the struct into a Vec.
     pub fn serialize(&self) -> Result<Vec<u8>, Error<C>> {

diff --git a/frost-core/src/frost/identifier.rs b/frost-core/src/frost/identifier.rs
@@ -17,6 +17,7 @@ use crate::ScalarSerialization;
 /// field, as f(0) = the shared secret.
 #[derive(Copy, Clone, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(try_from = "ScalarSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(into = "ScalarSerialization<C>"))]
 pub struct Identifier<C: Ciphersuite>(Scalar<C>);

diff --git a/frost-core/src/frost/keys.rs b/frost-core/src/frost/keys.rs
@@ -49,6 +49,7 @@ pub(crate) fn default_identifiers<C: Ciphersuite>(max_signers: u16) -> Vec<Ident
 /// A secret scalar value representing a signer's share of the group secret.
 #[derive(Clone, Copy, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(try_from = "ScalarSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(into = "ScalarSerialization<C>"))]
 pub struct SigningShare<C: Ciphersuite>(pub(crate) Scalar<C>);
@@ -146,6 +147,7 @@ where
 /// A public group element that represents a single signer's public verification share.
 #[derive(Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(try_from = "ElementSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(into = "ElementSerialization<C>"))]
 pub struct VerifyingShare<C>(pub(super) Element<C>)
@@ -229,6 +231,7 @@ where
 /// verifiable secret sharing for a Shamir secret share.
 #[derive(Clone, Copy, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(try_from = "ElementSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(into = "ElementSerialization<C>"))]
 pub struct CoefficientCommitment<C: Ciphersuite>(pub(crate) Element<C>);
@@ -302,6 +305,7 @@ where
 /// ensure that they received the correct (and same) value.
 #[derive(Clone, Debug, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 pub struct VerifiableSecretSharingCommitment<C: Ciphersuite>(
     pub(crate) Vec<CoefficientCommitment<C>>,
 );
@@ -350,6 +354,7 @@ where
 /// .into(), which under the hood also performs validation.
 #[derive(Clone, Debug, Zeroize, PartialEq, Eq, Getters)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(deny_unknown_fields))]
 pub struct SecretShare<C: Ciphersuite> {
     /// The participant identifier of this [`SecretShare`].
@@ -424,7 +429,7 @@ where
 #[cfg(feature = "serialization")]
 impl<C> SecretShare<C>
 where
-    C: Ciphersuite + serde::Serialize + for<'de> serde::Deserialize<'de>,
+    C: Ciphersuite,
 {
     /// Serialize the struct into a Vec.
     pub fn serialize(&self) -> Result<Vec<u8>, Error<C>> {
@@ -575,6 +580,7 @@ fn evaluate_vss<C: Ciphersuite>(
 /// [`KeyPackage`]s, which they store to later use during signing.
 #[derive(Clone, Debug, PartialEq, Eq, Getters, Zeroize)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(deny_unknown_fields))]
 pub struct KeyPackage<C: Ciphersuite> {
     /// Denotes the participant identifier each secret share key package is owned by.
@@ -628,7 +634,7 @@ where
 #[cfg(feature = "serialization")]
 impl<C> KeyPackage<C>
 where
-    C: Ciphersuite + serde::Serialize + for<'de> serde::Deserialize<'de>,
+    C: Ciphersuite,
 {
     /// Serialize the struct into a Vec.
     pub fn serialize(&self) -> Result<Vec<u8>, Error<C>> {
@@ -675,6 +681,7 @@ where
 /// Used for verification purposes before publishing a signature.
 #[derive(Clone, Debug, PartialEq, Eq, Getters)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(deny_unknown_fields))]
 pub struct PublicKeyPackage<C: Ciphersuite> {
     /// The verifying shares for all participants. Used to validate signature
@@ -715,7 +722,7 @@ where
 #[cfg(feature = "serialization")]
 impl<C> PublicKeyPackage<C>
 where
-    C: Ciphersuite + serde::Serialize + for<'de> serde::Deserialize<'de>,
+    C: Ciphersuite,
 {
     /// Serialize the struct into a Vec.
     pub fn serialize(&self) -> Result<Vec<u8>, Error<C>> {

diff --git a/frost-core/src/frost/keys/dkg.rs b/frost-core/src/frost/keys/dkg.rs
@@ -58,6 +58,7 @@ pub mod round1 {
     /// between the first and second parts of the DKG protocol (round 1).
     #[derive(Clone, Debug, PartialEq, Eq, Getters)]
     #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+    #[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
     #[cfg_attr(feature = "serde", serde(deny_unknown_fields))]
     pub struct Package<C: Ciphersuite> {
         /// The public commitment from the participant (C_i)
@@ -97,7 +98,7 @@ pub mod round1 {
     #[cfg(feature = "serialization")]
     impl<C> Package<C>
     where
-        C: Ciphersuite + serde::Serialize + for<'de> serde::Deserialize<'de>,
+        C: Ciphersuite,
     {
         /// Serialize the struct into a Vec.
         pub fn serialize(&self) -> Result<Vec<u8>, Error<C>> {
@@ -176,6 +177,7 @@ pub mod round2 {
     /// The package must be sent on an *confidential* and *authenticated* channel.
     #[derive(Clone, Debug, PartialEq, Eq, Getters)]
     #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+    #[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
     #[cfg_attr(feature = "serde", serde(deny_unknown_fields))]
     pub struct Package<C: Ciphersuite> {
         /// The secret share being sent.
@@ -209,7 +211,7 @@ pub mod round2 {
     #[cfg(feature = "serialization")]
     impl<C> Package<C>
     where
-        C: Ciphersuite + serde::Serialize + for<'de> serde::Deserialize<'de>,
+        C: Ciphersuite,
     {
         /// Serialize the struct into a Vec.
         pub fn serialize(&self) -> Result<Vec<u8>, Error<C>> {

diff --git a/frost-core/src/frost/round1.rs b/frost-core/src/frost/round1.rs
@@ -106,6 +106,7 @@ where
 /// A group element that is a commitment to a signing nonce share.
 #[derive(Clone, Copy, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(try_from = "ElementSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(into = "ElementSerialization<C>"))]
 pub struct NonceCommitment<C: Ciphersuite>(pub(super) Element<C>);
@@ -266,6 +267,7 @@ where
 /// SigningCommitment can be used for exactly *one* signature.
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Getters)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(deny_unknown_fields))]
 pub struct SigningCommitments<C: Ciphersuite> {
     /// Commitment to the hiding [`Nonce`].
@@ -314,7 +316,7 @@ where
 #[cfg(feature = "serialization")]
 impl<C> SigningCommitments<C>
 where
-    C: Ciphersuite + serde::Serialize + for<'de> serde::Deserialize<'de>,
+    C: Ciphersuite,
 {
     /// Serialize the struct into a Vec.
     pub fn serialize(&self) -> Result<Vec<u8>, Error<C>> {

diff --git a/frost-core/src/frost/round2.rs b/frost-core/src/frost/round2.rs
@@ -16,6 +16,7 @@ use crate::ScalarSerialization;
 #[cfg(feature = "serde")]
 #[derive(Clone)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(try_from = "ScalarSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(into = "ScalarSerialization<C>"))]
 struct SignatureShareHelper<C: Ciphersuite>(Scalar<C>);
@@ -48,6 +49,7 @@ where
 /// shares into the joint signature.
 #[derive(Clone, Copy, Eq, PartialEq, Getters)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(deny_unknown_fields))]
 #[cfg_attr(feature = "serde", serde(try_from = "SignatureShareSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(into = "SignatureShareSerialization<C>"))]
@@ -104,6 +106,7 @@ where
 
 #[cfg(feature = "serde")]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(deny_unknown_fields))]
 struct SignatureShareSerialization<C: Ciphersuite> {
     share: SignatureShareHelper<C>,

diff --git a/frost-core/src/verifying_key.rs b/frost-core/src/verifying_key.rs
@@ -11,6 +11,7 @@ use crate::ElementSerialization;
 /// A valid verifying key for Schnorr signatures over a FROST [`Ciphersuite::Group`].
 #[derive(Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(try_from = "ElementSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(into = "ElementSerialization<C>"))]
 pub struct VerifyingKey<C>

diff --git a/frost-ed25519/src/lib.rs b/frost-ed25519/src/lib.rs
@@ -18,9 +18,6 @@ use sha2::{Digest, Sha512};
 
 use frost_core::frost;
 
-#[cfg(feature = "serde")]
-use frost_core::serde;
-
 #[cfg(test)]
 mod tests;
 
@@ -155,8 +152,6 @@ const CONTEXT_STRING: &str = "FROST-ED25519-SHA512-v1";
 
 /// An implementation of the FROST(Ed25519, SHA-512) ciphersuite.
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-#[cfg_attr(feature = "serde", serde(crate = "self::serde"))]
 pub struct Ed25519Sha512;
 
 impl Ciphersuite for Ed25519Sha512 {

diff --git a/frost-ed448/src/lib.rs b/frost-ed448/src/lib.rs
@@ -19,9 +19,6 @@ use sha3::{
 
 use frost_core::frost;
 
-#[cfg(feature = "serde")]
-use frost_core::serde;
-
 #[cfg(test)]
 mod tests;
 
@@ -150,8 +147,6 @@ const CONTEXT_STRING: &str = "FROST-ED448-SHAKE256-v1";
 
 /// An implementation of the FROST(Ed448, SHAKE256) ciphersuite.
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-#[cfg_attr(feature = "serde", serde(crate = "self::serde"))]
 pub struct Ed448Shake256;
 
 impl Ciphersuite for Ed448Shake256 {

diff --git a/frost-p256/src/lib.rs b/frost-p256/src/lib.rs
@@ -20,9 +20,6 @@ use sha2::{Digest, Sha256};
 
 use frost_core::frost;
 
-#[cfg(feature = "serde")]
-use frost_core::serde;
-
 #[cfg(test)]
 mod tests;
 
@@ -175,8 +172,6 @@ const CONTEXT_STRING: &str = "FROST-P256-SHA256-v1";
 
 /// An implementation of the FROST(P-256, SHA-256) ciphersuite.
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-#[cfg_attr(feature = "serde", serde(crate = "self::serde"))]
 pub struct P256Sha256;
 
 impl Ciphersuite for P256Sha256 {

diff --git a/frost-rerandomized/src/lib.rs b/frost-rerandomized/src/lib.rs
@@ -150,6 +150,7 @@ where
 /// A randomizer. A random scalar which is used to randomize the key.
 #[derive(Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serde", serde(bound = "C: Ciphersuite"))]
 #[cfg_attr(feature = "serde", serde(try_from = "ScalarSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(into = "ScalarSerialization<C>"))]
 #[cfg_attr(feature = "serde", serde(crate = "self::serde"))]

diff --git a/frost-ristretto255/src/lib.rs b/frost-ristretto255/src/lib.rs
@@ -15,9 +15,6 @@ use sha2::{Digest, Sha512};
 
 use frost_core::frost;
 
-#[cfg(feature = "serde")]
-use frost_core::serde;
-
 #[cfg(test)]
 mod tests;
 
@@ -141,8 +138,6 @@ const CONTEXT_STRING: &str = "FROST-RISTRETTO255-SHA512-v1";
 
 /// An implementation of the FROST(ristretto255, SHA-512) ciphersuite.
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-#[cfg_attr(feature = "serde", serde(crate = "self::serde"))]
 pub struct Ristretto255Sha512;
 
 impl Ciphersuite for Ristretto255Sha512 {

diff --git a/frost-secp256k1/src/lib.rs b/frost-secp256k1/src/lib.rs
@@ -21,9 +21,6 @@ use sha2::{Digest, Sha256};
 
 use frost_core::frost;
 
-#[cfg(feature = "serde")]
-use frost_core::serde;
-
 #[cfg(test)]
 mod tests;
 
@@ -175,8 +172,6 @@ const CONTEXT_STRING: &str = "FROST-secp256k1-SHA256-v1";
 
 /// An implementation of the FROST(secp256k1, SHA-256) ciphersuite.
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-#[cfg_attr(feature = "serde", serde(crate = "self::serde"))]
 pub struct Secp256K1Sha256;
 
 impl Ciphersuite for Secp256K1Sha256 {