Keystore 2.0 SPI: Make getAttestationIds return an empty array.

getAttestationIds shall return an empty array instead of null.

Bug: 184026478
Test: N/A
Change-Id: I6c6233fa50a83cf7d6354d2783525704a3b39d0d

core/api/system-current.txt

@@ -8123,7 +8123,7 @@ package android.security.keystore {
   }
 
   public final class KeyGenParameterSpec implements java.security.spec.AlgorithmParameterSpec {
-    method @Nullable public int[] getAttestationIds();
+    method @NonNull public int[] getAttestationIds();
     method public int getNamespace();
   }
 

keystore/java/android/security/keystore/KeyGenParameterSpec.java

@@ -353,7 +353,7 @@ public final class KeyGenParameterSpec implements AlgorithmParameterSpec, UserAu
             boolean userPresenceRequired,
             byte[] attestationChallenge,
             boolean devicePropertiesAttestationIncluded,
-            int[] attestationIds,
+            @NonNull int[] attestationIds,
             boolean uniqueIdIncluded,
             boolean userAuthenticationValidWhileOnBody,
             boolean invalidatedByBiometricEnrollment,
@@ -779,9 +779,8 @@ public final class KeyGenParameterSpec implements AlgorithmParameterSpec, UserAu
      * @return integer array representing the requested device IDs to attest.
      */
     @SystemApi
-    @Nullable
-    public int[] getAttestationIds() {
-        return Utils.cloneIfNotNull(mAttestationIds);
+    public @NonNull int[] getAttestationIds() {
+        return mAttestationIds.clone();
     }
 
     /**
@@ -911,7 +910,7 @@ public final class KeyGenParameterSpec implements AlgorithmParameterSpec, UserAu
         private boolean mUserPresenceRequired = false;
         private byte[] mAttestationChallenge = null;
         private boolean mDevicePropertiesAttestationIncluded = false;
-        private int[] mAttestationIds = null;
+        private int[] mAttestationIds = new int[0];
         private boolean mUniqueIdIncluded = false;
         private boolean mUserAuthenticationValidWhileOnBody;
         private boolean mInvalidatedByBiometricEnrollment = true;

keystore/java/android/security/keystore2/AndroidKeyStoreKeyPairGeneratorSpi.java

@@ -655,7 +655,7 @@ public abstract class AndroidKeyStoreKeyPairGeneratorSpi extends KeyPairGenerato
             }
 
             int[] idTypes = mSpec.getAttestationIds();
-            if (idTypes == null) {
+            if (idTypes.length == 0) {
                 return;
             }
             final Set<Integer> idTypesSet = new ArraySet<>(idTypes.length);