Switches to newtype wrapper for Oid

openssl/src/pkey.rs

@@ -70,14 +70,26 @@ pub enum Public {}
 /// A tag type indicating that a key has private components.
 pub enum Private {}
 
-/// The OIDs that identify the type of a key.
-#[derive(PartialEq, Debug)]
-pub enum OID {
-    RSA,
-    HMAC,
-    DSA,
-    DH,
-    EC,
+/// The Oids that identify the type of a key.
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
+pub struct Oid(c_int);
+
+impl Oid {
+    /// Creates a `Oid` from an integer representation.
+    pub fn from_raw(value: c_int) -> Oid {
+        Oid(value)
+    }
+
+    /// Returns the integer representation of `Oid`.
+    pub fn as_raw(&self) -> c_int {
+        self.0
+    }
+
+    pub const RSA: Oid = Oid(ffi::EVP_PKEY_RSA);
+    pub const HMAC: Oid = Oid(ffi::EVP_PKEY_HMAC);
+    pub const DSA: Oid = Oid(ffi::EVP_PKEY_DSA);
+    pub const DH: Oid = Oid(ffi::EVP_PKEY_DH);
+    pub const EC: Oid = Oid(ffi::EVP_PKEY_EC);
 }
 
 /// A trait indicating that a key has parameters.
@@ -166,22 +178,15 @@ impl<T> PKeyRef<T> {
         }
     }
 
-    /// Returns `Some(OID)` as the type of this key or `None`, if the OID is supported by this
+    /// Returns `Some(Oid)` as the type of this key or `None`, if the Oid is supported by this
     /// library.
     ///
     /// This corresponds to [`EVP_PKEY_id`].
     ///
     /// [`EVP_PKEY_id`]: https://www.openssl.org/docs/man1.1.0/crypto/EVP_PKEY_id.html
-    pub fn get_id(&self) -> Option<OID> {
+    pub fn oid(&self) -> Oid {
         unsafe {
-            match ffi::EVP_PKEY_id(self.as_ptr()) {
-                ffi::EVP_PKEY_RSA => Some(OID::RSA),
-                ffi::EVP_PKEY_HMAC => Some(OID::HMAC),
-                ffi::EVP_PKEY_DSA => Some(OID::DSA),
-                ffi::EVP_PKEY_DH => Some(OID::DH),
-                ffi::EVP_PKEY_EC => Some(OID::EC),
-                _ => None,
-            }
+            Oid::from_raw(ffi::EVP_PKEY_id(self.as_ptr()))
         }
     }
 }
@@ -560,7 +565,7 @@ mod tests {
         let rsa = Rsa::generate(2048).unwrap();
         let pkey = PKey::from_rsa(rsa).unwrap();
         pkey.rsa().unwrap();
-        assert_eq!(pkey.get_id().unwrap(), OID::RSA);
+        assert_eq!(pkey.oid(), Oid::RSA);
         assert!(pkey.dsa().is_err());
     }
 
@@ -569,7 +574,7 @@ mod tests {
         let dsa = Dsa::generate(2048).unwrap();
         let pkey = PKey::from_dsa(dsa).unwrap();
         pkey.dsa().unwrap();
-        assert_eq!(pkey.get_id().unwrap(), OID::DSA);
+        assert_eq!(pkey.oid(), Oid::DSA);
         assert!(pkey.rsa().is_err());
     }
 
@@ -579,7 +584,7 @@ mod tests {
         let dh = Dh::params_from_pem(dh).unwrap();
         let pkey = PKey::from_dh(dh).unwrap();
         pkey.dh().unwrap();
-        assert_eq!(pkey.get_id().unwrap(), OID::DH);
+        assert_eq!(pkey.oid(), Oid::DH);
         assert!(pkey.rsa().is_err());
     }
 
@@ -588,7 +593,7 @@ mod tests {
         let ec_key = EcKey::from_curve_name(Nid::X9_62_PRIME256V1).unwrap();
         let pkey = PKey::from_ec_key(ec_key).unwrap();
         pkey.ec_key().unwrap();
-        assert_eq!(pkey.get_id().unwrap(), OID::EC);
+        assert_eq!(pkey.oid(), Oid::EC);
         assert!(pkey.rsa().is_err());
     }
 }