android/libwvdrmengine/mediacrypto/test/WVCryptoPlugin_test.cpp

//
// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
// source code may only be used and distributed under the Widevine License
// Agreement.
//

//#define LOG_NDEBUG 0
#define LOG_TAG "WVCryptoPluginTest"
#include <utils/Log.h>

#include <map>
#include <stdio.h>
#include <string>
#include <vector>

#include <binder/MemoryDealer.h>
#include <hidl/Status.h>
#include <hidlmemory/mapping.h>

#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "wv_cdm_constants.h"
#include "wv_cdm_types.h"
#include "wv_content_decryption_module.h"
#include "HidlTypes.h"
#include "OEMCryptoCENC.h"
#include "TypeConvert.h"
#include "WVCryptoPlugin.h"

namespace wvdrm {
namespace hardware {
namespace drm {
namespace V1_4 {
namespace widevine {

using ::android::MemoryDealer;

using ::testing::_;
using ::testing::DefaultValue;
using ::testing::DoAll;
using ::testing::ElementsAreArray;
using ::testing::Field;
using ::testing::InSequence;
using ::testing::Matcher;
using ::testing::SetArgPointee;
using ::testing::StrictMock;
using ::testing::Test;
using ::testing::Truly;
using ::testing::Value;
using ::testing::internal::ElementsAreArrayMatcher;

using wvcdm::kCipherModeCtr;
using wvcdm::kCipherModeCbc;
using wvcdm::CdmCipherMode;
using wvcdm::CdmDecryptionParametersV16;
using wvcdm::CdmDecryptionSample;
using wvcdm::CdmDecryptionSubsample;
using wvcdm::CdmQueryMap;
using wvcdm::CdmResponseType;
using wvcdm::CdmSessionId;
using wvcdm::KeyId;
using wvcdm::KEY_ID_SIZE;
using wvcdm::KEY_IV_SIZE;
using wvcdm::QUERY_KEY_SECURITY_LEVEL;
using wvcdm::QUERY_VALUE_SECURITY_LEVEL_L1;
using wvcdm::QUERY_VALUE_SECURITY_LEVEL_L3;

class MockCDM : public wvcdm::WvContentDecryptionModule {
 public:
  MOCK_METHOD1(IsOpenSession, bool(const CdmSessionId&));

  MOCK_METHOD3(DecryptV16, CdmResponseType(const CdmSessionId&, bool,
                                           const CdmDecryptionParametersV16&));

  MOCK_METHOD2(QuerySessionStatus, CdmResponseType(const CdmSessionId&,
                                                   CdmQueryMap*));
};

class WVCryptoPluginTest : public Test {
 protected:
  static const uint32_t kSessionIdSize = 16;
  uint8_t* pDest = nullptr;
  uint8_t* pSrc = nullptr;
  uint8_t sessionId[kSessionIdSize];
  uint32_t nextBufferId = 0;
  std::map<void *, uint32_t> heapBases;

  virtual void SetUp() {
    FILE* fp = fopen("/dev/urandom", "r");
    fread(sessionId, sizeof(uint8_t), kSessionIdSize, fp);
    fclose(fp);

    // Set default CdmResponseType value for gMock
    DefaultValue<CdmResponseType>::Set(wvcdm::NO_ERROR);
    heapBases.clear();
  }

  void setHeapBase(WVCryptoPlugin& plugin,
                   const sp<android::IMemoryHeap>& heap) {
    ASSERT_NE(heap, nullptr);

    void* heapBase = heap->getBase();
    ASSERT_NE(heapBase, nullptr);

    native_handle_t* nativeHandle = native_handle_create(1, 0);
    ASSERT_NE(nativeHandle, nullptr);

    nativeHandle->data[0] = heap->getHeapID();

    auto hidlHandle = hidl_handle(nativeHandle);
    auto hidlMemory = hidl_memory("ashmem", hidlHandle, heap->getSize());
    heapBases.insert(
        std::pair<void*, uint32_t>(heapBase, nextBufferId));
    Return<void> hResult =
        plugin.setSharedBufferBase(hidlMemory, nextBufferId++);

    ALOGE_IF(!hResult.isOk(), "setHeapBase failed setSharedBufferBase");
  }

  void toSharedBuffer(WVCryptoPlugin& plugin,
                      const sp<android::IMemory>& memory,
                      SharedBuffer* buffer) {
    ssize_t offset;
    size_t size;

    ASSERT_NE(memory, nullptr);
    ASSERT_NE(buffer, nullptr);

    sp<android::IMemoryHeap> heap = memory->getMemory(&offset, &size);
    ASSERT_NE(heap, nullptr);

    setHeapBase(plugin, heap);
    buffer->bufferId = heapBases[heap->getBase()];
    buffer->offset = offset >= 0 ? offset : 0;
    buffer->size = size;
  }
};

TEST_F(WVCryptoPluginTest, CorrectlyReportsSecureBuffers) {
  android::sp<StrictMock<MockCDM>> cdm = new StrictMock<MockCDM>();

  CdmQueryMap l1Map;
  l1Map[QUERY_KEY_SECURITY_LEVEL] = QUERY_VALUE_SECURITY_LEVEL_L1;
  CdmQueryMap l3Map;
  l3Map[QUERY_KEY_SECURITY_LEVEL] = QUERY_VALUE_SECURITY_LEVEL_L3;

  // Provide the expected behavior for IsOpenSession
  EXPECT_CALL(*cdm, IsOpenSession(_))
      .WillRepeatedly(testing::Return(true));

  // Specify the expected calls to QuerySessionStatus
  EXPECT_CALL(*cdm, QuerySessionStatus(_, _))
      .WillOnce(DoAll(SetArgPointee<1>(l1Map),
                      testing::Return(wvcdm::NO_ERROR)))
      .WillOnce(DoAll(SetArgPointee<1>(l3Map),
                      testing::Return(wvcdm::NO_ERROR)));

  WVCryptoPlugin plugin(sessionId, kSessionIdSize, cdm.get());

  EXPECT_TRUE(plugin.requiresSecureDecoderComponent("video/mp4")) <<
      "WVCryptoPlugin incorrectly allows an insecure video decoder on L1";
  EXPECT_FALSE(plugin.requiresSecureDecoderComponent("video/mp4")) <<
      "WVCryptoPlugin incorrectly expects a secure video decoder on L3";
  EXPECT_FALSE(plugin.requiresSecureDecoderComponent("audio/aac")) <<
      "WVCryptoPlugin incorrectly expects a secure audio decoder";
}

// TODO(b/28295739):
// Add New MediaCrypto Unit Tests for CBC & Pattern Mode in cdmPatternDesc.

// Predicate that validates that the fields of a passed-in
// CdmDecryptionParametersV16 match the values it was given at construction
// time.
//
// This could be done with a huge pile of gMock matchers, but it is ugly and
// unmaintainable, particularly once you get into validating the subsamples. The
// logic here is complex enough to warrant a custom matcher for this one test.
class CDPMatcher {
 public:
  // TODO(b/35259313): Uncomment the removed parameters once the matcher can
  //                   convert them from HIDL accesses to physical addresses.
  CDPMatcher(const uint8_t* keyId, bool isSecure, Mode cipherMode,
             const Pattern& pattern,
             const uint8_t* /* input */, size_t inputLength,
             const uint8_t* /* output */, size_t outputLength, const uint8_t* iv,
             const SubSample* subsamples, size_t subsamplesLength)
    : mKeyId(keyId, keyId + KEY_ID_SIZE), mIsSecure(isSecure),
      mCipherMode(cipherMode), mPattern(pattern), /* mInput(input), */
      mInputLength(inputLength), /* mOutput(output), */
      mOutputLength(outputLength), mIv(iv, iv + KEY_IV_SIZE),
      mSubsamples(subsamples, subsamples + subsamplesLength) {}

  bool operator()(const CdmDecryptionParametersV16& params) const {
    if (mCipherMode == Mode::AES_CTR &&
        params.cipher_mode != kCipherModeCtr) {
      return false;
    } else if (mCipherMode == Mode::AES_CBC &&
        params.cipher_mode != kCipherModeCbc) {
      return false;
    }

    if (params.key_id != mKeyId ||
        params.is_secure != mIsSecure ||
        params.pattern.encrypt_blocks != mPattern.encryptBlocks ||
        params.pattern.skip_blocks != mPattern.skipBlocks ||
        params.samples.size() != 1) {
      return false;
    }

    const CdmDecryptionSample& sample = params.samples[0];
    if (// TODO(b/35259313): Convert from a HIDL access to a physical address.
        // sample.encrypt_buffer != mInput ||
        sample.encrypt_buffer_length != mInputLength ||
        // TODO(b/35259313): Convert from a HIDL access to a physical address.
        // sample.decrypt_buffer != mOutput ||
        sample.decrypt_buffer_size != mOutputLength ||
        sample.decrypt_buffer_offset != 0 ||
        sample.iv != mIv ||
        sample.subsamples.size() != mSubsamples.size()) {
      return false;
    }

    for (size_t i = 0; i < mSubsamples.size(); ++i) {
      const SubSample& androidSubsample = mSubsamples[i];
      const CdmDecryptionSubsample& cdmSubsample = sample.subsamples[i];

      if (cdmSubsample.clear_bytes != androidSubsample.numBytesOfClearData ||
          cdmSubsample.protected_bytes != androidSubsample.numBytesOfEncryptedData) {
        return false;
      }
    }

    return true;
  }

 private:
  const KeyId mKeyId;
  const bool mIsSecure;
  const Mode mCipherMode;
  const Pattern mPattern;
  // TODO(b/35259313): Uncomment this field once the matcher can convert this
  //                   from a HIDL access to a physical address.
  // const uint8_t* const mInput;
  const size_t mInputLength;
  // TODO(b/35259313): Uncomment this field once the matcher can convert this
  //                   from a HIDL access to a physical address.
  // const uint8_t* const mOutput;
  const size_t mOutputLength;
  const std::vector<uint8_t> mIv;
  const std::vector<SubSample> mSubsamples;
};

TEST_F(WVCryptoPluginTest, AttemptsToDecrypt) {
  android::sp<StrictMock<MockCDM>> cdm = new StrictMock<MockCDM>();

  constexpr size_t kSubSampleCount = 6;
  SubSample subSamples[kSubSampleCount];
  memset(subSamples, 0, sizeof(subSamples));
  subSamples[0].numBytesOfEncryptedData = 16;
  subSamples[1].numBytesOfClearData = 16;
  subSamples[1].numBytesOfEncryptedData = 16;
  subSamples[2].numBytesOfEncryptedData = 8;
  subSamples[3].numBytesOfClearData = 29;
  subSamples[3].numBytesOfEncryptedData = 24;
  subSamples[4].numBytesOfEncryptedData = 60;
  subSamples[5].numBytesOfEncryptedData = 16;

  std::vector<SubSample> subSamplesVector(
      subSamples, subSamples + sizeof(subSamples) / sizeof(subSamples[0]));
  auto hSubSamples = hidl_vec<SubSample>(subSamplesVector);

  uint8_t keyId[KEY_ID_SIZE];
  uint8_t iv[KEY_IV_SIZE];

  static const size_t kDataSize = 185;
  uint8_t inputData[kDataSize];

  FILE* fp = fopen("/dev/urandom", "r");
  fread(keyId, sizeof(uint8_t), KEY_ID_SIZE, fp);
  fread(iv, sizeof(uint8_t), KEY_IV_SIZE, fp);
  fread(inputData, sizeof(uint8_t), kDataSize, fp);
  fclose(fp);

  sp<MemoryDealer> memDealer = new MemoryDealer(
      kDataSize * 2, "WVCryptoPlugin_test");
  sp<android::IMemory> source = memDealer->allocate(kDataSize);
  ASSERT_NE(source, nullptr);
  pSrc = static_cast<uint8_t*>(
      static_cast<void*>(source->unsecurePointer()));
  ASSERT_NE(pSrc, nullptr);
  memcpy(pSrc, inputData, source->size());

  sp<android::IMemory> destination = memDealer->allocate(kDataSize);
  ASSERT_NE(destination, nullptr);
  pDest = static_cast<uint8_t*>(
      static_cast<void*>(destination->unsecurePointer()));
  ASSERT_NE(pDest, nullptr);

  Pattern noPattern = { 0, 0 };

  // Provide the expected behavior for IsOpenSession
  EXPECT_CALL(*cdm, IsOpenSession(_))
      .WillRepeatedly(testing::Return(true));

  // Specify the expected calls to Decrypt
  CDPMatcher paramsMatcher(keyId, false, Mode::AES_CTR, noPattern, pSrc,
                           kDataSize, pDest, kDataSize, iv, subSamples,
                           kSubSampleCount);

  EXPECT_CALL(*cdm, DecryptV16(ElementsAreArray(sessionId, kSessionIdSize),
                               true,
                               Truly(paramsMatcher)))
      .Times(1);

  WVCryptoPlugin plugin(sessionId, kSessionIdSize, cdm.get());

  uint32_t bytesWritten = 0;
  std::string errorDetailMessage;
  DestinationBuffer hDestination;
  hDestination.type = BufferType::SHARED_MEMORY;
  toSharedBuffer(plugin, destination, &hDestination.nonsecureMemory);

  SharedBuffer sourceBuffer;
  toSharedBuffer(plugin, source, &sourceBuffer);

  plugin.decrypt(
      false, hidl_array<uint8_t, 16>(keyId), hidl_array<uint8_t, 16>(iv),
      Mode::AES_CTR, noPattern, hSubSamples, sourceBuffer, 0, hDestination,
      [&](Status status, uint32_t hBytesWritten, hidl_string hDetailedError) {
        EXPECT_EQ(status, Status::OK);

        bytesWritten = hBytesWritten;
        errorDetailMessage.assign(hDetailedError.c_str());
      });

  EXPECT_EQ(kDataSize, bytesWritten) <<
            "WVCryptoPlugin decrypted the wrong number of bytes";
  EXPECT_EQ(0u, errorDetailMessage.size()) <<
            "WVCryptoPlugin reported a detailed error message.";
}

TEST_F(WVCryptoPluginTest, RejectsCens) {
  android::sp<StrictMock<MockCDM>> cdm = new StrictMock<MockCDM>();

  constexpr size_t kSubSampleCount = 2;
  SubSample subSamples[kSubSampleCount];
  memset(subSamples, 0, sizeof(subSamples));
  subSamples[0].numBytesOfEncryptedData = 16;
  subSamples[1].numBytesOfClearData = 16;
  subSamples[1].numBytesOfEncryptedData = 16;

  std::vector<SubSample> subSamplesVector(
      subSamples, subSamples + sizeof(subSamples) / sizeof(subSamples[0]));
  auto hSubSamples = hidl_vec<SubSample>(subSamplesVector);

  uint8_t keyId[KEY_ID_SIZE];
  uint8_t iv[KEY_IV_SIZE];

  static const size_t kDataSize = 48;
  uint8_t inputData[kDataSize];

  FILE* fp = fopen("/dev/urandom", "r");
  fread(keyId, sizeof(uint8_t), KEY_ID_SIZE, fp);
  fread(iv, sizeof(uint8_t), KEY_IV_SIZE, fp);
  fread(inputData, sizeof(uint8_t), kDataSize, fp);
  fclose(fp);

  sp<MemoryDealer> memDealer = new MemoryDealer(
      kDataSize * 2, "WVCryptoPlugin_test");
  sp<android::IMemory> source = memDealer->allocate(kDataSize);
  ASSERT_NE(source, nullptr);
  pSrc = static_cast<uint8_t*>(
      static_cast<void*>(source->unsecurePointer()));
  ASSERT_NE(pSrc, nullptr);
  memcpy(pSrc, inputData, source->size());

  sp<android::IMemory> destination = memDealer->allocate(kDataSize);
  ASSERT_NE(destination, nullptr);
  pDest = static_cast<uint8_t*>(
      static_cast<void*>(destination->unsecurePointer()));
  ASSERT_NE(pDest, nullptr);

  Pattern recommendedPattern = { 1, 9 };

  // Provide the expected behavior for IsOpenSession
  EXPECT_CALL(*cdm, IsOpenSession(_))
      .WillRepeatedly(testing::Return(true));

  // Refuse calls to Decrypt
  EXPECT_CALL(*cdm, DecryptV16(_, _, _))
      .Times(0);

  WVCryptoPlugin plugin(sessionId, kSessionIdSize, cdm.get());

  DestinationBuffer hDestination;
  hDestination.type = BufferType::SHARED_MEMORY;
  toSharedBuffer(plugin, destination, &hDestination.nonsecureMemory);

  SharedBuffer sourceBuffer;
  toSharedBuffer(plugin, source, &sourceBuffer);

  plugin.decrypt(
      false, hidl_array<uint8_t, 16>(keyId), hidl_array<uint8_t, 16>(iv),
      Mode::AES_CTR, recommendedPattern, hSubSamples, sourceBuffer, 0,
      hDestination,
      [&](Status status, uint32_t bytesWritten,
          hidl_string /* errorDetailMessage */) {
        EXPECT_EQ(status, Status::BAD_VALUE);
        EXPECT_EQ(bytesWritten, 0);
      });
}

TEST_F(WVCryptoPluginTest, CommunicatesSecureBufferRequest) {
  android::sp<StrictMock<MockCDM>> cdm = new StrictMock<MockCDM>();

  uint8_t keyId[KEY_ID_SIZE];
  uint8_t iv[KEY_IV_SIZE];

  static const size_t kDataSize = 32;
  uint8_t in[kDataSize];

  FILE* fp = fopen("/dev/urandom", "r");
  fread(keyId, sizeof(uint8_t), KEY_ID_SIZE, fp);
  fread(iv, sizeof(uint8_t), KEY_IV_SIZE, fp);
  fread(in, sizeof(uint8_t), kDataSize, fp);
  fclose(fp);

  SubSample subSample;
  subSample.numBytesOfClearData = 16;
  subSample.numBytesOfEncryptedData = 16;
  std::vector<SubSample> subSampleVector;
  subSampleVector.push_back(subSample);
  auto hSubSamples = hidl_vec<SubSample>(subSampleVector);

  // Provide the expected behavior for IsOpenSession
  EXPECT_CALL(*cdm, IsOpenSession(_))
      .WillRepeatedly(testing::Return(true));

  // Specify the expected calls to Decrypt
  {
    InSequence calls;

    typedef CdmDecryptionParametersV16 CDP;

    EXPECT_CALL(*cdm, DecryptV16(_, _, Field(&CDP::is_secure, false)))
        .Times(1);

    EXPECT_CALL(*cdm, DecryptV16(_, _, Field(&CDP::is_secure, true)))
        .Times(1);
  }

  sp<MemoryDealer> memDealer = new MemoryDealer(
      kDataSize * 2, "WVCryptoPlugin_test");
  sp<android::IMemory> source = memDealer->allocate(kDataSize);
  ASSERT_NE(source, nullptr);
  pSrc = static_cast<uint8_t*>(
      static_cast<void*>(source->unsecurePointer()));
  ASSERT_NE(pSrc, nullptr);
  memcpy(pSrc, in, source->size());

  sp<android::IMemory> destination = memDealer->allocate(kDataSize);
  ASSERT_NE(destination, nullptr);
  pDest = static_cast<uint8_t*>(
      static_cast<void*>(destination->unsecurePointer()));
  ASSERT_NE(pDest, nullptr);

  WVCryptoPlugin plugin(sessionId, kSessionIdSize, cdm.get());

  uint32_t bytesWritten = 0;
  std::string errorDetailMessage;
  DestinationBuffer hDestination;
  hDestination.type = BufferType::SHARED_MEMORY;
  toSharedBuffer(plugin, destination, &hDestination.nonsecureMemory);
  Pattern noPattern = { 0, 0 };

  SharedBuffer sourceBuffer;
  toSharedBuffer(plugin, source, &sourceBuffer);

  plugin.decrypt(
      false, hidl_array<uint8_t, 16>(keyId), hidl_array<uint8_t, 16>(iv),
      Mode::AES_CTR, noPattern, hSubSamples, sourceBuffer, 0, hDestination,
      [&](Status status, uint32_t hBytesWritten, hidl_string hDetailedError) {
        EXPECT_EQ(status, Status::OK);

        bytesWritten = hBytesWritten;
        errorDetailMessage.assign(hDetailedError.c_str());
      });

  EXPECT_EQ(0u, errorDetailMessage.size()) <<
            "WVCryptoPlugin reported a detailed error message.";

  plugin.decrypt(
      true, hidl_array<uint8_t, 16>(keyId), hidl_array<uint8_t, 16>(iv),
      Mode::AES_CTR, noPattern, hSubSamples, sourceBuffer, 0, hDestination,
      [&](Status status, uint32_t hBytesWritten, hidl_string hDetailedError) {
        EXPECT_EQ(status, Status::OK);

        bytesWritten = hBytesWritten;
        errorDetailMessage.assign(hDetailedError.c_str());
      });

  EXPECT_EQ(0u, errorDetailMessage.size()) <<
            "WVCryptoPlugin reported a detailed error message.";
}

TEST_F(WVCryptoPluginTest, AllowsSessionIdChanges) {
  android::sp<StrictMock<MockCDM>> cdm = new StrictMock<MockCDM>();

  uint8_t keyId[KEY_ID_SIZE];
  uint8_t iv[KEY_IV_SIZE];
  uint8_t sessionId2[kSessionIdSize];

  static const size_t kDataSize = 32;
  uint8_t in[kDataSize];

  FILE* fp = fopen("/dev/urandom", "r");
  fread(keyId, sizeof(uint8_t), KEY_ID_SIZE, fp);
  fread(iv, sizeof(uint8_t), KEY_IV_SIZE, fp);
  fread(sessionId2, sizeof(uint8_t), kSessionIdSize, fp);
  fread(in, sizeof(uint8_t), kDataSize, fp);
  fclose(fp);

  SubSample subSample;
  subSample.numBytesOfClearData = 16;
  subSample.numBytesOfEncryptedData = 16;
  std::vector<SubSample> subSampleVector;
  subSampleVector.push_back(subSample);
  auto hSubSamples = hidl_vec<SubSample>(subSampleVector);

  std::vector<uint8_t> sessionIdVector(sessionId, sessionId + kSessionIdSize);
  std::vector<uint8_t> sessionId2Vector(sessionId2,
                                        sessionId2 + kSessionIdSize);

  // Provide the expected behavior for IsOpenSession
  EXPECT_CALL(*cdm, IsOpenSession(_))
      .WillRepeatedly(testing::Return(true));

  // Specify the expected calls to Decrypt
  {
    InSequence calls;

    EXPECT_CALL(*cdm,
                DecryptV16(ElementsAreArray(sessionId, kSessionIdSize), _, _))
        .Times(1);

    EXPECT_CALL(*cdm,
                DecryptV16(ElementsAreArray(sessionId2, kSessionIdSize), _, _))
        .Times(1);
  }

  sp<MemoryDealer> memDealer = new MemoryDealer(
      kDataSize * 2, "WVCryptoPlugin_test");
  sp<android::IMemory> source = memDealer->allocate(kDataSize);
  ASSERT_NE(source, nullptr);
  pSrc = static_cast<uint8_t*>(
      static_cast<void*>(source->unsecurePointer()));
  ASSERT_NE(pSrc, nullptr);
  memcpy(pSrc, in, source->size());

  sp<android::IMemory> destination = memDealer->allocate(kDataSize);
  ASSERT_NE(destination, nullptr);
  pDest = static_cast<uint8_t*>(
      static_cast<void*>(destination->unsecurePointer()));
  ASSERT_NE(pDest, nullptr);

  uint8_t blank[1];  // Some compilers will not accept 0.
  WVCryptoPlugin plugin(blank, 0, cdm.get());

  uint32_t bytesWritten = 0;
  std::string errorDetailMessage;
  DestinationBuffer hDestination;
  hDestination.type = BufferType::SHARED_MEMORY;
  toSharedBuffer(plugin, destination, &hDestination.nonsecureMemory);
  Pattern noPattern = { 0, 0 };

  SharedBuffer sourceBuffer;
  toSharedBuffer(plugin, source, &sourceBuffer);

  Status status = plugin.setMediaDrmSession(sessionIdVector);
  EXPECT_EQ(status, Status::OK);

  plugin.decrypt(
      false, hidl_array<uint8_t, 16>(keyId), hidl_array<uint8_t, 16>(iv),
      Mode::AES_CTR, noPattern, hSubSamples, sourceBuffer, 0, hDestination,
      [&](Status status, uint32_t hBytesWritten, hidl_string hDetailedError) {
        EXPECT_EQ(status, Status::OK);

        bytesWritten = hBytesWritten;
        errorDetailMessage.assign(hDetailedError.c_str());
      });

  EXPECT_EQ(0u, errorDetailMessage.size()) <<
            "WVCryptoPlugin reported a detailed error message.";

  status = plugin.setMediaDrmSession(sessionId2Vector);
  EXPECT_EQ(status, Status::OK);

  plugin.decrypt(
      false, hidl_array<uint8_t, 16>(keyId), hidl_array<uint8_t, 16>(iv),
      Mode::AES_CTR, noPattern, hSubSamples, sourceBuffer, 0, hDestination,
      [&](Status status, uint32_t hBytesWritten, hidl_string hDetailedError) {
        EXPECT_EQ(status, Status::OK);

        bytesWritten = hBytesWritten;
        errorDetailMessage.assign(hDetailedError.c_str());
      });

  EXPECT_EQ(0u, errorDetailMessage.size()) <<
            "WVCryptoPlugin reported a detailed error message.";
}

TEST_F(WVCryptoPluginTest, DisallowsUnopenedSessionIdChanges) {
  android::sp<StrictMock<MockCDM>> cdm = new StrictMock<MockCDM>();

  uint8_t blank[1];  // Some compilers will not accept 0.
  std::vector<uint8_t> sessionIdVector(sessionId, sessionId + kSessionIdSize);

  // Specify the expected calls to IsOpenSession
  {
    InSequence calls;

    EXPECT_CALL(*cdm, IsOpenSession(ElementsAreArray(blank, 0)))
        .WillOnce(testing::Return(false));

    EXPECT_CALL(*cdm, IsOpenSession(ElementsAreArray(sessionId, kSessionIdSize)))
        .WillOnce(testing::Return(false))
        .WillOnce(testing::Return(true));
  }

  WVCryptoPlugin plugin(blank, 0, cdm.get());

  Status status = plugin.setMediaDrmSession(sessionIdVector);
  EXPECT_EQ(status, Status::ERROR_DRM_SESSION_NOT_OPENED);

  status = plugin.setMediaDrmSession(sessionIdVector);
  EXPECT_EQ(status, Status::OK);
}

}  // namespace widevine
}  // namespace V1_4
}  // namespace drm
}  // namespace hardware
}  // namespace wvdrm