fuzzer for net::NormalizeName

net/cert/internal/verify_name_match_normalizename_fuzzer.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/cert/internal/verify_name_match.h"
+
+#include "net/der/input.h"
+
+// Entry point for LibFuzzer.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  net::der::Input in(data, size);
+  std::string normalized_der;
+  bool success = net::NormalizeName(in, &normalized_der);
+  if (success) {
+    // If the input was successfully normalized, re-normalizing it should
+    // produce the same output again.
+    std::string renormalized_der;
+    bool renormalize_success =
+        net::NormalizeName(net::der::Input(&normalized_der), &renormalized_der);
+    CHECK(renormalize_success);
+    CHECK_EQ(normalized_der, renormalized_der);
+  }
+  return 0;
+}