public static final KeysetHandle read(KeysetReader reader)
      throws GeneralSecurityException, IOException {
    Keyset keyset = reader.read();
    validate(keyset);
    return KeysetHandle.fromKeyset(keyset);
  }
@return a new keyset handle from a keyset obtained from {@code reader}.
@throws GeneralSecurityException
java_src/src/main/java/com/google/crypto/tink/NoSecretKeysetHandle.java