pkey/Id: implement TryInto<&str>

Author: huwcbjones

openssl/src/pkey.rs

@@ -119,6 +119,41 @@ impl Id {
     }
 }
 
+impl TryFrom<Id> for &'static str {
+    type Error = ();
+    fn try_from(id: Id) -> Result<Self, Self::Error> {
+        match id {
+            Id::RSA => Ok("RSA"),
+            #[cfg(any(ossl111, libressl310, boringssl, awslc))]
+            Id::RSA_PSS => Ok("RSA-PSS"),
+            #[cfg(not(boringssl))]
+            Id::HMAC => Ok("HMAC"),
+            #[cfg(not(any(boringssl, awslc)))]
+            Id::CMAC => Ok("CMAC"),
+            Id::DSA => Ok("DSA"),
+            Id::DH => Ok("DH"),
+            #[cfg(ossl110)]
+            Id::DHX => Ok("DHX"),
+            Id::EC => Ok("EC"),
+            #[cfg(ossl111)]
+            Id::SM2 => Ok("SM2"),
+            #[cfg(any(ossl110, boringssl, libressl360, awslc))]
+            Id::HKDF => Ok("HKDF"),
+            #[cfg(any(ossl111, boringssl, libressl370, awslc))]
+            Id::ED25519 => Ok("Ed25519"),
+            #[cfg(ossl111)]
+            Id::ED448 => Ok("Ed448"),
+            #[cfg(any(ossl111, boringssl, libressl370, awslc))]
+            Id::X25519 => Ok("X25519"),
+            #[cfg(ossl111)]
+            Id::X448 => Ok("X448"),
+            #[cfg(ossl111)]
+            Id::POLY1305 => Ok("POLY1305"),
+            _ => Err(()),
+        }
+    }
+}
+
 /// A trait indicating that a key has parameters.
 pub unsafe trait HasParams {}
 
@@ -382,35 +417,7 @@ where
 
 impl<T> fmt::Debug for PKey<T> {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let alg = match self.id() {
-            Id::RSA => "RSA",
-            #[cfg(any(ossl111, libressl310, boringssl, awslc))]
-            Id::RSA_PSS => "RSA-PSS",
-            #[cfg(not(boringssl))]
-            Id::HMAC => "HMAC",
-            #[cfg(not(any(boringssl, awslc)))]
-            Id::CMAC => "CMAC",
-            Id::DSA => "DSA",
-            Id::DH => "DH",
-            #[cfg(ossl110)]
-            Id::DHX => "DHX",
-            Id::EC => "EC",
-            #[cfg(ossl111)]
-            Id::SM2 => "SM2",
-            #[cfg(any(ossl110, boringssl, libressl360, awslc))]
-            Id::HKDF => "HKDF",
-            #[cfg(any(ossl111, boringssl, libressl370, awslc))]
-            Id::ED25519 => "Ed25519",
-            #[cfg(ossl111)]
-            Id::ED448 => "Ed448",
-            #[cfg(any(ossl111, boringssl, libressl370, awslc))]
-            Id::X25519 => "X25519",
-            #[cfg(ossl111)]
-            Id::X448 => "X448",
-            #[cfg(ossl111)]
-            Id::POLY1305 => "POLY1305",
-            _ => "unknown",
-        };
+        let alg = self.id().try_into().unwrap_or("unknown");
         fmt.debug_struct("PKey").field("algorithm", &alg).finish()
         // TODO: Print details for each specific type of key
     }