Add OEMCrypto_GetBootCertificateChain fuzzer

Merged from https://widevine-internal-review.googlesource.com/168818
Merged from https://widevine-internal-review.googlesource.com/169890

Change-Id: I2530555a1cf94726c82511504e480b843b244c7b

libwvdrmengine/oemcrypto/test/fuzz_tests/oemcrypto_get_boot_certificate_chain_fuzz.cc

@@ -0,0 +1,40 @@
+// Copyright 2023 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine
+// License Agreement.
+
+#include <vector>
+
+#include "FuzzedDataProvider.h"
+#include "OEMCryptoCENC.h"
+#include "oemcrypto_fuzz_helper.h"
+
+using namespace wvoec;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  // Redirect printf and log statements from oemcrypto functions to a file to
+  // reduce noise
+  RedirectStdoutToFile();
+
+  static InitializeFuzz initialize_fuzz;
+  FuzzedDataProvider fuzzed_data(data, size);
+
+  // bcc and bcc_length parameters
+  size_t bcc_length_data =
+      fuzzed_data.ConsumeIntegralInRange<size_t>(0, MAX_FUZZ_OUTPUT_LENGTH);
+  std::vector<uint8_t> bcc(bcc_length_data);
+  size_t* const bcc_length =
+      fuzzed_data.ConsumeBool() ? &bcc_length_data : nullptr;
+
+  // additional_signature and additional_signature_length parameters
+  size_t additional_signature_length_data =
+      fuzzed_data.ConsumeIntegralInRange<size_t>(0, MAX_FUZZ_OUTPUT_LENGTH);
+  std::vector<uint8_t> additional_signature(additional_signature_length_data);
+  size_t* const additional_signature_length =
+      fuzzed_data.ConsumeBool() ? &additional_signature_length_data : nullptr;
+
+  OEMCrypto_GetBootCertificateChain(bcc.data(), bcc_length,
+                                    additional_signature.data(),
+                                    additional_signature_length);
+
+  return 0;
+}