private KeysetManager readKeysetInCleartext(byte[] serializedKeyset)
        throws GeneralSecurityException, IOException {
      return KeysetManager.withKeysetHandle(
          CleartextKeysetHandle.read(BinaryKeysetReader.withBytes(serializedKeyset)));
    }
Returns the serialized keyset if it exist or null.
java_src/src/main/java/com/google/crypto/tink/integration/android/AndroidKeysetManager.java