Add a bunch of NSS ASN.1 fuzzers

testing/libfuzzer/fuzzers/nss/asn1_bmpstring_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 <stddef.h>
+#include <stdint.h>
+
+#include <nss.h>
+#include <nspr.h>
+#include <secasn1.h>
+#include <secder.h>
+#include <secport.h>
+
+// Entry point for LibFuzzer.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  const SEC_ASN1Template* the_template = SEC_ASN1_GET(SEC_BMPStringTemplate);
+  SECItem quick_dest = {siBuffer, nullptr, 0};
+  SECItem legacy_dest = {siBuffer, nullptr, 0};
+
+  // Attempt the QuickDER path.
+  PLArenaPool* quick_arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+  if (!quick_arena)
+    return 0;
+
+  SECItem quick_src = {siBuffer, const_cast<unsigned char*>(
+                                     static_cast<const unsigned char*>(data)),
+                       static_cast<unsigned int>(size)};
+  SEC_QuickDERDecodeItem(quick_arena, &quick_dest, the_template, &quick_src);
+  PORT_FreeArena(quick_arena, PR_FALSE);
+
+  // Attempt the Legacy path.
+  PLArenaPool* legacy_arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+  if (!legacy_arena)
+    return 0;
+
+  SECItem legacy_src = {siBuffer, const_cast<unsigned char*>(
+                                      static_cast<const unsigned char*>(data)),
+                        static_cast<unsigned int>(size)};
+
+  SEC_ASN1DecodeItem(legacy_arena, &legacy_dest, the_template, &legacy_src);
+  PORT_FreeArena(legacy_arena, PR_FALSE);
+
+  return 0;
+}