Add OEMCrypto_GenerateCertificateKeyPair fuzzer

Merged from https://widevine-internal-review.googlesource.com/168817
Merged from https://widevine-internal-review.googlesource.com/169915

Change-Id: If4d3f4cd2b028765072a14c74781e9750dc3e38b

libwvdrmengine/oemcrypto/test/fuzz_tests/oemcrypto_generate_certificate_key_pair_fuzz.cc

@@ -0,0 +1,54 @@
+// 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 OEMCryptoProvisioningAPIFuzz provisioning_api_fuzz;
+  FuzzedDataProvider fuzzed_data(data, size);
+
+  // public_key and public_key_length parameters
+  size_t public_key_length_data =
+      fuzzed_data.ConsumeIntegralInRange<size_t>(0, MAX_FUZZ_OUTPUT_LENGTH);
+  std::vector<uint8_t> public_key(public_key_length_data);
+  size_t* const public_key_length =
+      fuzzed_data.ConsumeBool() ? &public_key_length_data : nullptr;
+
+  // public_key_signature and public_key_signature_length parameters
+  size_t public_key_signature_length_data =
+      fuzzed_data.ConsumeIntegralInRange<size_t>(0, MAX_FUZZ_OUTPUT_LENGTH);
+  std::vector<uint8_t> public_key_signature(public_key_signature_length_data);
+  size_t* const public_key_signature_length =
+      fuzzed_data.ConsumeBool() ? &public_key_signature_length_data : nullptr;
+
+  // wrapped_private_key and wrapped_private_key_length parameters
+  size_t wrapped_private_key_length_data =
+      fuzzed_data.ConsumeIntegralInRange<size_t>(0, MAX_FUZZ_OUTPUT_LENGTH);
+  std::vector<uint8_t> wrapped_private_key(wrapped_private_key_length_data);
+  size_t* const wrapped_private_key_length =
+      fuzzed_data.ConsumeBool() ? &wrapped_private_key_length_data : nullptr;
+
+  // key_type parameter
+  OEMCrypto_PrivateKeyType key_type_data;
+  OEMCrypto_PrivateKeyType* const key_type =
+      fuzzed_data.ConsumeBool() ? &key_type_data : nullptr;
+
+  OEMCrypto_GenerateCertificateKeyPair(
+      provisioning_api_fuzz.session()->session_id(), public_key.data(),
+      public_key_length, public_key_signature.data(),
+      public_key_signature_length, wrapped_private_key.data(),
+      wrapped_private_key_length, key_type);
+
+  return 0;
+}