Update and remove unused dependencies

crypto/dkg/Cargo.toml

@@ -18,9 +18,6 @@ thiserror = "1"
 rand_core = "0.6"
 
 zeroize = { version = "^1.5", features = ["zeroize_derive"] }
-subtle = "2"
-
-hex = "0.4"
 
 transcript = { package = "flexible-transcript", path = "../transcript", version = "0.2", features = ["recommended"] }
 chacha20 = { version = "0.9", features = ["zeroize"] }

crypto/dkg/src/encryption.rs

@@ -66,7 +66,7 @@ impl<C: Ciphersuite, M: Message> EncryptionKeyMessage<C, M> {
     buf
   }
 
-  // Used by tests
+  #[cfg(any(test, feature = "tests"))]
   pub(crate) fn enc_key(&self) -> C::G {
     self.enc_key
   }