OEMCrypto v18.3

Updates to OEMCrypto API, OPK, ODK, and unit tests.

See the file CHANGELOG.md for details.

util/test/test_sleep.h

@@ -13,7 +13,9 @@ namespace wvutil {
 
 class TestSleep {
  public:
-  // The callback is called when the clock should be advanced.
+  // The callback is called when the test clock should be advanced. If the
+  // system uses a real clock, it is used to sync the real and test
+  // clock. Otherwise it is used to simulate sleep in the test clock.
   class CallBack {
    public:
     virtual void ElapseTime(int64_t milliseconds) = 0;
@@ -27,6 +29,9 @@ class TestSleep {
   // callback exists, this calls the callback.
   static void Sleep(unsigned int seconds);
 
+  // Like sleep, above, except it sleeps until the specified time.
+  static void SleepUntil(int64_t desired_time);
+
   // If we are using a real clock and a fake clock, then the real clock advances
   // a little while we are doing work, but the fake one only advances when we
   // sleep. This function advances the fake clock to be in sync with the real