ed25519-dalek: bring signature identifiers

This allows to use ed25519 to create certificates for example

Author: baloo

ed25519-dalek/src/signing.rs

@@ -722,6 +722,14 @@ impl TryFrom<&pkcs8::KeypairBytes> for SigningKey {
     }
 }
 
+#[cfg(feature = "pkcs8")]
+impl pkcs8::spki::SignatureAlgorithmIdentifier for SigningKey {
+    type Params = pkcs8::spki::der::AnyRef<'static>;
+
+    const SIGNATURE_ALGORITHM_IDENTIFIER: pkcs8::spki::AlgorithmIdentifier<Self::Params> =
+        <Signature as pkcs8::spki::AssociatedAlgorithmIdentifier>::ALGORITHM_IDENTIFIER;
+}
+
 #[cfg(feature = "pkcs8")]
 impl From<SigningKey> for pkcs8::KeypairBytes {
     fn from(signing_key: SigningKey) -> pkcs8::KeypairBytes {

ed25519-dalek/src/verifying.rs

@@ -610,6 +610,15 @@ impl TryFrom<&[u8]> for VerifyingKey {
     }
 }
 
+#[cfg(feature = "pkcs8")]
+impl pkcs8::spki::SignatureAlgorithmIdentifier for VerifyingKey {
+    type Params = pkcs8::spki::der::AnyRef<'static>;
+
+    const SIGNATURE_ALGORITHM_IDENTIFIER: pkcs8::spki::AlgorithmIdentifier<Self::Params> =
+        <ed25519::Signature as pkcs8::spki::AssociatedAlgorithmIdentifier>::ALGORITHM_IDENTIFIER;
+}
+
+
 impl From<VerifyingKey> for EdwardsPoint {
     fn from(vk: VerifyingKey) -> EdwardsPoint {
         vk.point