Add unknown alg for jwk

From #400 by @ThatNerdUKnow

Author: Keats

src/jwk.rs

@@ -190,6 +190,10 @@ pub enum KeyAlgorithm {
     /// RSAES-OAEP-256 using SHA-2
     #[serde(rename = "RSA-OAEP-256")]
     RSA_OAEP_256,
+
+    /// Catch-All for when the key algorithm can not be determined or is not supported
+    #[serde(other)]
+    UNKNOWN_ALGORITHM,
 }
 
 impl FromStr for KeyAlgorithm {
@@ -443,7 +447,7 @@ mod tests {
     use serde_json::json;
     use wasm_bindgen_test::wasm_bindgen_test;
 
-    use crate::jwk::{AlgorithmParameters, JwkSet, OctetKeyType};
+    use crate::jwk::{AlgorithmParameters, JwkSet, KeyAlgorithm, OctetKeyType};
     use crate::serialization::b64_encode;
     use crate::Algorithm;
 
@@ -477,4 +481,12 @@ mod tests {
             _ => panic!("Unexpected key algorithm"),
         }
     }
+
+    #[test]
+    fn deserialize_unknown_key_algorithm() {
+        let key_alg_json = json!("");
+        let key_alg_result: KeyAlgorithm =
+            serde_json::from_value(key_alg_json).expect("Could not deserialize json");
+        assert_eq!(key_alg_result, KeyAlgorithm::UNKNOWN_ALGORITHM);
+    }
 }