ed25519: use serdect for serde support

ed25519/Cargo.toml

@@ -22,8 +22,7 @@ signature = { version = "3", default-features = false }
 
 # optional dependencies
 pkcs8 = { version = "0.11", optional = true }
-serde = { version = "1", optional = true, default-features = false }
-serde_bytes = { version = "0.11", optional = true, default-features = false }
+serdect = { version = "0.4", optional = true, default-features = false }
 zeroize = { version = "1", optional = true, default-features = false }
 zerocopy = { version = "0.8", optional = true, features = ["derive"] }
 
@@ -37,7 +36,7 @@ rand_core = { version = "0.9", features = ["std"] }
 default = ["alloc"]
 alloc = ["pkcs8?/alloc"]
 pem = ["alloc", "pkcs8/pem"]
-serde_bytes = ["serde", "dep:serde_bytes"]
+serde = ["dep:serdect"]
 
 [lints]
 workspace = true

ed25519/src/lib.rs

@@ -260,9 +260,6 @@ mod hex;
 #[cfg(feature = "pkcs8")]
 pub mod pkcs8;
 
-#[cfg(feature = "serde")]
-mod serde;
-
 pub use signature::{self, Error, SignatureEncoding};
 
 #[cfg(feature = "pkcs8")]
@@ -278,6 +275,8 @@ use core::fmt;
 
 #[cfg(feature = "alloc")]
 use alloc::vec::Vec;
+#[cfg(feature = "serde")]
+use serdect::serde::{Deserialize, Serialize, de, ser};
 
 #[cfg(all(feature = "alloc", feature = "pkcs8"))]
 use pkcs8::spki::{
@@ -451,6 +450,28 @@ impl fmt::Display for Signature {
     }
 }
 
+#[cfg(feature = "serde")]
+impl Serialize for Signature {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: ser::Serializer,
+    {
+        serdect::array::serialize_hex_upper_or_bin(&self.to_bytes(), serializer)
+    }
+}
+
+#[cfg(feature = "serde")]
+impl<'de> Deserialize<'de> for Signature {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: de::Deserializer<'de>,
+    {
+        let mut bytes = [0u8; Signature::BYTE_SIZE];
+        serdect::array::deserialize_hex_or_bin(&mut bytes, deserializer)?;
+        Ok(bytes.into())
+    }
+}
+
 #[cfg(feature = "zeroize")]
 impl Zeroize for Signature {
     fn zeroize(&mut self) {