Enable OEMCrypto Unit Tests

This is a merge from the widevine repository of
http://go/wvgerrit/13923 Switch openssl to use the EVP interface for aes-ctr-128
http://go/wvgerrit/13979 Add Test Certificate to OEMCrypto Mock
http://go/wvgerrit/13978 Add Test Keybox to Level 3 OEMCrypto
http://go/wvgerrit/13873 Enable OEMCrypto Unit Tests

This CL adds a main program to oemcrypto_test.cpp, which filters out
tests that are not supported on the specified platform. It also adds
LoadTestKeybox to the mock. This allows oemcrypto unit tests to be run
on devices that have production keybox.  It also allows the same set
of unit tests to work on Android and on non-Android platforms.

b/18962381 Use test certificate (partial fix)
b/19867990 Separate cast receiver tests

Change-Id: If89c31530103ed85aa37d7379bd5b4dc2a927f38

libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_device_properties_cert.cpp

@@ -0,0 +1,56 @@
+// Copyright 2015 Google Inc. All Rights Reserved.
+//
+//  Mock implementation of OEMCrypto APIs
+//
+//  This file contains oemcrypto engine properties that would be for a
+//  level 2 device that does not have persistant storage or a keybox.
+//  Note: this is for illustration only.  Production devices are rarely level 2.
+#include "oemcrypto_engine_mock.h"
+
+namespace wvoec_mock {
+
+// If local_display() returns true, we pretend we are using a built-in display,
+// instead of HDMI or WiFi output.
+bool CryptoEngine::local_display() {
+  return true;
+}
+
+// A closed platform is permitted to use clear buffers.
+bool CryptoEngine::closed_platform() {
+  return false;
+}
+
+// Returns the HDCP version currently in use.
+OEMCrypto_HDCP_Capability CryptoEngine::current_hdcp_capability() {
+  return local_display() ? HDCP_NO_DIGITAL_OUTPUT : HDCP_V1;
+}
+
+// Returns the max HDCP version supported.
+OEMCrypto_HDCP_Capability CryptoEngine::maximum_hdcp_capability() {
+  return HDCP_NO_DIGITAL_OUTPUT;
+}
+
+// Returns true if the client supports persistent storage of
+// offline usage table information.
+bool CryptoEngine::supports_storage() {
+  return false;
+}
+
+// Returns true if the client uses a keybox as the root of trust.
+bool CryptoEngine::supports_keybox() {
+  return false;
+}
+
+// Returns true to indicate the client does support anti-rollback hardware.
+bool CryptoEngine::is_anti_rollback_hw_present() {
+  return false;
+}
+
+// Returns "L3" for a software only library.  L1 is for hardware protected keys
+// and data paths.  L2 is for hardware protected keys but no data path
+// protection.
+const char* CryptoEngine::security_level() {
+  return "L2";
+}
+
+}  // namespace wvoec_mock