Merge "Use Usage information from OEMCrypto on clock rollback" into sc-dev

libwvdrmengine/cdm/core/src/license.cpp

@@ -864,13 +864,13 @@ CdmResponseType CdmLicense::RestoreOfflineLicense(
           break;
         case CryptoSession::kUsageDurationsValid: {
           int64_t current_time = clock_->GetCurrentTime();
-          if (current_time - seconds_since_started > 0)
-            playback_start_time = current_time - seconds_since_started;
-          if (current_time - last_playback_time > 0)
-            last_playback_time = current_time - seconds_since_last_played;
+          playback_start_time = current_time - seconds_since_started;
+          last_playback_time = current_time - seconds_since_last_played;
           break;
         }
         default:
+          // Use playback_start_time and last_playback_time from
+          // persistently stored license data
           break;
       }
     }

libwvdrmengine/cdm/test/request_license_test.cpp

@@ -6598,6 +6598,69 @@ TEST_F(WvCdmRequestLicenseRollbackTest, Offline_RollbackBeforeRestoreKey) {
   ASSERT_EQ(NO_ERROR, decryptor_->CloseSession(session_id_));
 }
 
+// The difference between this test and Offline_RollbackBeforeRestoreKey is
+// that this test has a 15 second expiration window.
+// Offline_RollbackBeforeRestoreKey has a 5 second window. The rollback
+// before restore causes the expiration timer to run from the rollback time.
+// The license in Offline_RollbackBeforeRestoreKey is expired by the time
+// the rollback is undone, while this one has not yet expired.
+TEST_F(WvCdmRequestLicenseRollbackTest,
+       Offline_LongerDurationRollbackBeforeRestoreKey) {
+  Unprovision();
+  Provision();
+
+  // The default offline asset is "offline_clip2". Substitute '2' for '8'.
+  // "offline_clip8" has a 15 second expiration.
+  std::string key_id;
+  std::string client_auth;
+  GetOfflineConfiguration(&key_id, &client_auth);
+  key_id[key_id.size() - 1] = '8';
+
+  ASSERT_EQ(NO_ERROR, decryptor_->OpenSession(config_.key_system(), nullptr,
+                                              kDefaultCdmIdentifier, nullptr,
+                                              &session_id_));
+  GenerateKeyRequest(key_id, kLicenseTypeOffline);
+  VerifyKeyRequestResponse(config_.license_server(), client_auth);
+
+  // Verify that we can decrypt a subsample to begin with.
+  EXPECT_EQ(NO_ERROR, Decrypt(session_id_));
+
+  CdmKeySetId key_set_id = key_set_id_;
+  EXPECT_FALSE(key_set_id_.empty());
+  decryptor_->CloseSession(session_id_);
+
+  // This number must be > the time between GenerateKeyRequest and this call.
+  RollbackSystemTime(10 * 1000);
+
+  session_id_.clear();
+  decryptor_->OpenSession(config_.key_system(), nullptr, kDefaultCdmIdentifier,
+                          nullptr, &session_id_);
+
+  decryptor_->RestoreKey(session_id_, key_set_id);
+
+  // Verify we can't decrypt. The license start time is in the future.
+  EXPECT_EQ(DECRYPT_NOT_READY, Decrypt(session_id_));
+
+  RestoreSystemTime();
+
+  // Sleep for a little bit to account for the execution time of OpenSession and
+  // RestoreKey.
+  std::this_thread::sleep_for(std::chrono::milliseconds(kExpirationWindowMs_));
+
+  // Verify we can decrypt.
+  EXPECT_EQ(NO_ERROR, Decrypt(session_id_));
+
+  // Sleep for a while more.
+  std::this_thread::sleep_for(std::chrono::milliseconds(kExpirationTimeMs_));
+
+  // Rollback time + kExpirationWindowMs_ + kExpirationTimeMs_ (~17s) will have
+  // elapsed. This is greater than the expiration window for longer duration
+  // licenses (15s). The license should have expired.
+  EXPECT_EQ(NEED_KEY, Decrypt(session_id_));
+
+  ASSERT_EQ(NO_ERROR, decryptor_->CloseSession(session_id_));
+}
+
 TEST_F(WvCdmRequestLicenseRollbackTest,
        Offline_RollbackAndExpireAfterRestoreKey) {
   Unprovision();
@@ -6636,6 +6699,8 @@ TEST_F(WvCdmRequestLicenseRollbackTest,
 
   RestoreSystemTime();
 
+  EXPECT_EQ(NEED_KEY, Decrypt(session_id_));
+
   ASSERT_EQ(NO_ERROR, decryptor_->CloseSession(session_id_));
 }
 
@@ -6670,9 +6735,11 @@ TEST_F(WvCdmRequestLicenseRollbackTest,
   std::this_thread::sleep_for(
       std::chrono::milliseconds(kExpirationWithWindowMs_));
 
+  // Verify that we can no longer decrypt a subsample due to key expiration.
+  EXPECT_EQ(NEED_KEY, Decrypt(session_id_));
+
   RollbackSystemTime(kExpirationWithWindowMs_);
 
-  // Verify that we can no longer decrypt a subsample due to key expiration.
   EXPECT_EQ(NEED_KEY, Decrypt(session_id_));
 
   RestoreSystemTime();