feat(identity): add From impls for specific keypair types

Closes #3618.

Pull-Request: #3626.

CHANGELOG.md

@@ -13,6 +13,7 @@
 - [`libp2p-floodsub` CHANGELOG](protocols/floodsub/CHANGELOG.md)
 - [`libp2p-gossipsub` CHANGELOG](protocols/gossipsub/CHANGELOG.md)
 - [`libp2p-identify` CHANGELOG](protocols/identify/CHANGELOG.md)
+- [`libp2p-identity` CHANGELOG](protocols/identity/CHANGELOG.md)
 - [`libp2p-kad` CHANGELOG](protocols/kad/CHANGELOG.md)
 - [`libp2p-mdns` CHANGELOG](protocols/mdns/CHANGELOG.md)
 - [`libp2p-ping` CHANGELOG](protocols/ping/CHANGELOG.md)

identity/CHANGELOG.md

@@ -0,0 +1,6 @@
+# 0.1.1 [unreleased]
+
+- Add `From` impl for specific keypairs.
+  See [PR 3626].
+
+[PR 3626]: https://github.com/libp2p/rust-libp2p/pull/3626

identity/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "libp2p-identity"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 description = "Data structures and algorithms for identifying peers in libp2p."
 rust-version = "1.60.0"

identity/src/keypair.rs

@@ -264,6 +264,38 @@ impl Keypair {
     }
 }
 
+#[cfg(feature = "ecdsa")]
+impl From<ecdsa::Keypair> for Keypair {
+    fn from(kp: ecdsa::Keypair) -> Self {
+        #[allow(deprecated)]
+        Keypair::Ecdsa(kp)
+    }
+}
+
+#[cfg(feature = "ed25519")]
+impl From<ed25519::Keypair> for Keypair {
+    fn from(kp: ed25519::Keypair) -> Self {
+        #[allow(deprecated)]
+        Keypair::Ed25519(kp)
+    }
+}
+
+#[cfg(feature = "secp256k1")]
+impl From<secp256k1::Keypair> for Keypair {
+    fn from(kp: secp256k1::Keypair) -> Self {
+        #[allow(deprecated)]
+        Keypair::Secp256k1(kp)
+    }
+}
+
+#[cfg(all(feature = "rsa", not(target_arch = "wasm32")))]
+impl From<rsa::Keypair> for Keypair {
+    fn from(kp: rsa::Keypair) -> Self {
+        #[allow(deprecated)]
+        Keypair::Rsa(kp)
+    }
+}
+
 /// The public key of a node's identity keypair.
 #[derive(Clone, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub enum PublicKey {