Merge "Handle unparsable public keys"

keystore/java/android/security/keystore2/AndroidKeyStoreProvider.java

@@ -38,6 +38,7 @@ import java.security.PublicKey;
 import java.security.Security;
 import java.security.Signature;
 import java.security.UnrecoverableKeyException;
+import java.security.cert.X509Certificate;
 import java.security.interfaces.ECPublicKey;
 import java.security.interfaces.RSAPublicKey;
 
@@ -221,7 +222,14 @@ public class AndroidKeyStoreProvider extends Provider {
         }
         final byte[] x509PublicCert = metadata.certificate;
 
-        PublicKey publicKey = AndroidKeyStoreSpi.toCertificate(x509PublicCert).getPublicKey();
+        final X509Certificate parsedX509Certificate =
+                AndroidKeyStoreSpi.toCertificate(x509PublicCert);
+        if (parsedX509Certificate == null) {
+            throw new UnrecoverableKeyException("Failed to parse the X.509 certificate containing"
+                   + " the public key. This likely indicates a hardware problem.");
+        }
+
+        PublicKey publicKey = parsedX509Certificate.getPublicKey();
 
         String jcaKeyAlgorithm = publicKey.getAlgorithm();