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/core/include/cdm_engine.h

@@ -274,6 +274,16 @@ class CdmEngine {
 
   virtual size_t SessionSize() const { return session_map_.Size(); }
 
+  static CdmResponseType ParseDecryptHashString(const std::string& hash_string,
+                                                CdmSessionId* id,
+                                                uint32_t* frame_number,
+                                                std::string* hash);
+  virtual CdmResponseType SetDecryptHash(const CdmSessionId& session_id,
+                                         uint32_t frame_number,
+                                         const std::string& hash);
+  virtual CdmResponseType GetDecryptHashError(const CdmSessionId& session_id,
+                                              std::string* hash_error_string);
+
   // Is the key known to any session?
   virtual bool IsKeyLoaded(const KeyId& key_id);
   virtual bool FindSessionForKey(const KeyId& key_id, CdmSessionId* sessionId);

libwvdrmengine/cdm/core/include/cdm_session.h

@@ -193,6 +193,11 @@ class CdmSession {
                                         CdmSigningAlgorithm algorithm,
                                         const std::string& signature);
 
+  virtual CdmResponseType SetDecryptHash(uint32_t frame_number,
+                                               const std::string& hash);
+
+  virtual CdmResponseType GetDecryptHashError(std::string* hash_error_string);
+
   virtual metrics::SessionMetrics* GetMetrics() { return metrics_; }
 
  private:

libwvdrmengine/cdm/core/include/crypto_session.h

@@ -152,6 +152,14 @@ class CryptoSession {
   virtual bool GetResourceRatingTier(uint32_t* tier);
   virtual bool GetBuildInformation(std::string* info);
 
+  virtual uint32_t IsDecryptHashSupported();
+
+  virtual CdmResponseType SetDecryptHash(uint32_t frame_number,
+                                               const std::string& hash);
+
+  virtual CdmResponseType GetDecryptHashError(std::string* error_string);
+
+
   virtual CdmResponseType GenericEncrypt(const std::string& in_buffer,
                                          const std::string& key_id,
                                          const std::string& iv,

libwvdrmengine/cdm/core/include/wv_cdm_constants.h

@@ -82,6 +82,8 @@ static const std::string QUERY_KEY_WVCDM_VERSION = "WidevineCdmVersion";
 static const std::string QUERY_KEY_RESOURCE_RATING_TIER = "ResourceRatingTier";
 static const std::string QUERY_KEY_OEMCRYPTO_BUILD_INFORMATION =
     "OemCryptoBuildInformation";
+static const std::string QUERY_KEY_DECRYPT_HASH_SUPPORT =
+    "DecryptHashSupport";
 
 static const std::string QUERY_VALUE_TRUE = "True";
 static const std::string QUERY_VALUE_FALSE = "False";

libwvdrmengine/cdm/core/include/wv_cdm_types.h

@@ -338,6 +338,10 @@ enum CdmResponseType {
   DEVICE_CANNOT_REPROVISION = 293,
   SESSION_NOT_FOUND_19 = 294,
   KEY_SIZE_ERROR_2 = 295,
+  SET_DECRYPT_HASH_ERROR = 296,
+  GET_DECRYPT_HASH_ERROR = 297,
+  SESSION_NOT_FOUND_20 = 298,
+  INVALID_DECRYPT_HASH_FORMAT = 299,
   // Don't forget to add new values to ../test/test_printers.cpp.
 };