Update LoadTestKeybox

Merge from Widevine repo of http://go/wvgerrit/41662

This CL updates oemcrypto unit tests to use the new test keybox.

bug: 69552641 Update OEMCrypto_LoadTestKeybox

test: Unit tests compile and run -- many tests won't pass until merged
with vendor code

Change-Id: I73bdca3958b2c985d4c61801aa95807a2e6d4299

libwvdrmengine/oemcrypto/test/oec_session_util.h

@@ -149,7 +149,7 @@ class Session {
                           vector<uint8_t>* enc_context);
   // Generate known mac and enc keys using OEMCrypto_GenerateDerivedKeys and
   // also fill out enc_key_, mac_key_server_, and mac_key_client_.
-  void GenerateDerivedKeysFromKeybox();
+  void GenerateDerivedKeysFromKeybox(const wvoec_mock::WidevineKeybox& keybox);
   // Generate known mac and enc keys using OEMCrypto_DeriveKeysFromSessionKey
   // and also fill out enc_key_, mac_key_server_, and mac_key_client_.
   void GenerateDerivedKeysFromSessionKey();
@@ -371,6 +371,14 @@ class Session {
   size_t message_size() { return message_size_; }
 
  private:
+  // Generate mac and enc keys give the master key.
+  void DeriveKeys(const uint8_t* master_key,
+                  const vector<uint8_t>& mac_key_context,
+                  const vector<uint8_t>& enc_key_context);
+  // Internal utility function to derive key using CMAC-128
+  void DeriveKey(const uint8_t* key, const vector<uint8_t>& context,
+                 int counter, vector<uint8_t>* out);
+
   bool open_;
   bool forced_session_id_;
   OEMCrypto_SESSION session_id_;