Add decrypt hash support

[ Merge of http://go/wvgerrit/68083 ]

Add ability to query decrypt hash support, set a hash computed over a frame
and retrieve the last error at a later point.

Bug: 34080802
Test: WV unit/integration tests. New tests added to cdm_engine_test,
      libwvdrmdrmplugin_hidl_test and request_license_test.

Change-Id: I7548c8798c873a6af3e1cfc0df57c117e1e474a6

libwvdrmengine/cdm/src/wv_content_decryption_module.cpp

@@ -12,6 +12,7 @@
 #include "metrics.pb.h"
 #include "properties.h"
 #include "service_certificate.h"
+#include "string_conversions.h"
 #include "wv_cdm_constants.h"
 #include "wv_cdm_event_listener.h"
 
@@ -456,6 +457,44 @@ CdmResponseType WvContentDecryptionModule::CloseCdm(
   return NO_ERROR;
 }
 
+CdmResponseType WvContentDecryptionModule::SetDecryptHash(
+    const std::string& hash_data, CdmSessionId* id) {
+  if (id == nullptr) {
+    LOGE("WVContentDecryptionModule::SetDecryptHash: |id| was not provided");
+    return PARAMETER_NULL;
+  }
+
+  uint32_t frame_number;
+  std::string hash;
+  CdmResponseType res =
+      CdmEngine::ParseDecryptHashString(hash_data, id, &frame_number, &hash);
+
+  if (res != NO_ERROR) return res;
+
+  CdmEngine* cdm_engine = GetCdmForSessionId(*id);
+
+  if (!cdm_engine) {
+    LOGE("WVContentDecryptionModule::SetDecryptHash: Unable to find CdmEngine");
+    return SESSION_NOT_FOUND_20;
+  }
+
+  res = cdm_engine->SetDecryptHash(*id, frame_number, hash);
+  return res;
+}
+
+CdmResponseType WvContentDecryptionModule::GetDecryptHashError(
+    const CdmSessionId& session_id,
+    std::string* hash_error_string) {
+  CdmEngine* cdm_engine = GetCdmForSessionId(session_id);
+
+  if (!cdm_engine) {
+    LOGE("WVContentDecryptionModule::GetDecryptHashError: Unable to find "
+         "CdmEngine");
+    return SESSION_NOT_FOUND_20;
+  }
+  return cdm_engine->GetDecryptHashError(session_id, hash_error_string);
+}
+
 void WvContentDecryptionModule::EnablePolicyTimer() {
   std::unique_lock<std::mutex> auto_lock(policy_timer_lock_);
   if (!policy_timer_.IsRunning())