Update unit tests for v15.2

Merge from Widevine repo of http://go/wvgerrit/77609

For v15.2 we require that nonces not collide across sessions and there are
restrictions placed on the mac key's IV in LoadKeys.

Test: ran unit tests on reference code

Bug: 131325434
Bug: 131326334

Change-Id: I1bb01c30d8c15d66d762c28b57d7700c44daa835

libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp

@@ -1179,6 +1179,27 @@ TEST_F(OEMCryptoSessionTests, LoadKeyWithBadRange7) {
   ASSERT_NE(OEMCrypto_SUCCESS, sts);
 }
 
+// The IV should not be identical to the data right before the encrypted mac
+// keys.
+TEST_F(OEMCryptoSessionTests, LoadKeyWithSuspiciousIV) {
+  Session s;
+  ASSERT_NO_FATAL_FAILURE(s.open());
+  ASSERT_NO_FATAL_FAILURE(InstallTestSessionKeys(&s));
+  ASSERT_NO_FATAL_FAILURE(s.FillSimpleMessage(0, 0, 0));
+  // This is suspicious: the data right before the mac keys is identical to the
+  // iv.
+  memcpy(s.license().padding, s.license().mac_key_iv,
+         sizeof(s.license().padding));
+  ASSERT_NO_FATAL_FAILURE(s.EncryptAndSign());
+
+  OEMCryptoResult sts = OEMCrypto_LoadKeys(
+      s.session_id(), s.message_ptr(), s.message_size(), s.signature().data(),
+      s.signature().size(), s.enc_mac_keys_iv_substr(), s.enc_mac_keys_substr(),
+      s.num_keys(), s.key_array(), GetSubstring(), GetSubstring(),
+      OEMCrypto_ContentLicense);
+  ASSERT_NE(OEMCrypto_SUCCESS, sts);
+}
+
 // Test that LoadKeys fails when a key is loaded with no key control block.
 TEST_F(OEMCryptoSessionTests, LoadKeyWithNullKeyControl) {
   Session s;