Fix test initialization errors

This fixes test errors like the following:

```
Exception com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot find a (Map) Key deserializer for type [simple type, class com.yubico.webauthn.data.PublicKeyCredentialDescriptor] [in thread "Test worker"]
```

which also by extension means even if we fix the deserializer resolution,
`JsonIoSpec` will fail with `PublicKeyCredentialDescriptor` as keys because
input/output JSON will not be identical after deserializing from just the
credential ID. Therefore let's change the map key type to `ByteArray`. We can
keep the `PublicKeyCredentialDescriptor` key type in setters, but transform to
`ByteArray` keys during construction of the `PrfAuthenticationInput` value.

Author: emlun

webauthn-server-core/src/main/java/com/yubico/webauthn/data/AssertionExtensionInputs.java

@@ -30,8 +30,8 @@
 import com.yubico.webauthn.RelyingParty;
 import com.yubico.webauthn.StartAssertionOptions;
 import com.yubico.webauthn.extension.appid.AppId;
-import java.util.HashMap;
 import java.util.HashSet;
+import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
 import lombok.Builder;
@@ -195,8 +195,10 @@ public AssertionExtensionInputsBuilder largeBlob(
      */
     public AssertionExtensionInputsBuilder prf(
         Extensions.Prf.PrfValues eval,
-        HashMap<PublicKeyCredentialDescriptor, Extensions.Prf.PrfValues> evalByCredential) {
-      this.prf = new Extensions.Prf.PrfAuthenticationInput(eval, evalByCredential);
+        Map<PublicKeyCredentialDescriptor, Extensions.Prf.PrfValues> evalByCredential) {
+      this.prf =
+          new Extensions.Prf.PrfAuthenticationInput(
+              eval, Extensions.Prf.PrfAuthenticationInput.descriptorsToIds(evalByCredential));
       return this;
     }
 

webauthn-server-core/src/main/java/com/yubico/webauthn/data/Extensions.java

@@ -17,6 +17,7 @@
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -800,14 +801,12 @@ public static class PrfAuthenticationInput {
       /** */
       @JsonProperty private final PrfValues eval;
 
-      @JsonProperty
-      private final HashMap<PublicKeyCredentialDescriptor, PrfValues> evalByCredential;
+      @JsonProperty private final Map<ByteArray, PrfValues> evalByCredential;
 
       @JsonCreator
       public PrfAuthenticationInput(
           @JsonProperty("eval") PrfValues eval,
-          @JsonProperty("evalByCredential")
-              HashMap<PublicKeyCredentialDescriptor, PrfValues> evalByCredential) {
+          @JsonProperty("evalByCredential") Map<ByteArray, PrfValues> evalByCredential) {
         this.eval = eval;
         this.evalByCredential = evalByCredential;
       }
@@ -816,9 +815,24 @@ public Optional<PrfValues> getEval() {
         return Optional.ofNullable(eval);
       }
 
-      public Optional<HashMap<PublicKeyCredentialDescriptor, PrfValues>> getEvalByCredential() {
+      public Optional<Map<ByteArray, PrfValues>> getEvalByCredential() {
         return Optional.ofNullable(evalByCredential);
       }
+
+      static HashMap<ByteArray, PrfValues> descriptorsToIds(
+          Map<PublicKeyCredentialDescriptor, PrfValues> evalByCredential) {
+        return evalByCredential.entrySet().stream()
+            .reduce(
+                new HashMap<>(),
+                (ebc, entry) -> {
+                  ebc.put(entry.getKey().getId(), entry.getValue());
+                  return ebc;
+                },
+                (a, b) -> {
+                  a.putAll(b);
+                  return a;
+                });
+      }
     }
 
     /**