android/libwvdrmengine/oemcrypto/test/fuzz_tests/oemcrypto_fuzz_helper.cc

// Copyright 2020 Google LLC. All Rights Reserved. This file and proprietary
// source code may only be used and distributed under the Widevine
// License Agreement.
#include "oemcrypto_fuzz_helper.h"

namespace wvoec {
void RedirectStdoutToFile() { freopen("log.txt", "a", stdout); }

std::vector<FuzzedData> SplitFuzzedData(const uint8_t* data, size_t size) {
  std::vector<FuzzedData> result;
  const uint8_t* const end = data + size;
  // Using memmem to find separator.
  while (
      const uint8_t* const separator = reinterpret_cast<const uint8_t*>(memmem(
          data, end - data, kFuzzDataSeparator, sizeof(kFuzzDataSeparator)))) {
    result.push_back({data, static_cast<size_t>(separator - data)});
    data = separator + sizeof(kFuzzDataSeparator);
  }
  if (data < end) {
    result.push_back({data, static_cast<size_t>(end - data)});
  }
  return result;
}

void OEMCryptoLicenseAPIFuzz::LoadLicense() {
  license_messages_.SignAndVerifyRequest();
  license_messages_.CreateDefaultResponse();
  license_messages_.EncryptAndSignResponse();
  OEMCryptoResult sts = license_messages_.LoadResponse();
  CheckStatusAndExitFuzzerOnFailure(sts, OEMCrypto_SUCCESS);
}

void OEMCryptoProvisioningAPIFuzz::LoadProvisioning() {
  provisioning_messages_.SignAndVerifyRequest();
  provisioning_messages_.CreateDefaultResponse();
  provisioning_messages_.EncryptAndSignResponse();
  OEMCryptoResult sts = provisioning_messages_.LoadResponse();
  CheckStatusAndExitFuzzerOnFailure(sts, OEMCrypto_SUCCESS);
}

void LicenseWithUsageEntryFuzz::CreateUsageTableHeader() {
  size_t header_buffer_length = 0;
  OEMCryptoResult sts =
      OEMCrypto_CreateUsageTableHeader(nullptr, &header_buffer_length);
  encrypted_usage_header_.resize(header_buffer_length);
  sts = OEMCrypto_CreateUsageTableHeader(encrypted_usage_header_.data(),
                                         &header_buffer_length);
  CheckStatusAndExitFuzzerOnFailure(sts, OEMCrypto_SUCCESS);
}

void LicenseWithUsageEntryFuzz::LoadLicense() {
  license_messages_.SignAndVerifyRequest();
  license_messages_.CreateDefaultResponse();
  license_messages_.EncryptAndSignResponse();
  OEMCryptoResult sts = license_messages_.LoadResponse();
  CheckStatusAndExitFuzzerOnFailure(sts, OEMCrypto_SUCCESS);
}

void CheckStatusAndExitFuzzerOnFailure(OEMCryptoResult result,
                                       OEMCryptoResult expected_status) {
  if (result != expected_status) {
    abort();
  }
}
}  // namespace wvoec