Pick widevine oemcrypto-v18 change

No-Typo-Check: From a third party header file
Bug: 260918793
Test: unit tests
Test: atp v2/widevine-eng/drm_compliance
Change-Id: I36effd6a10a99bdb2399ab1f4a0fad026d607c70

libwvdrmengine/oemcrypto/test/oec_key_deriver.h

@@ -19,6 +19,7 @@ namespace wvoec {
 
 constexpr size_t kMaxTestRSAKeyLength = 2000;  // Rough estimate.
 constexpr size_t kMaxCoreProvRequest = 150;    // Rough estimate.
+constexpr size_t kMaxX509CertLength = 4000;    // Rough estimate.
 
 // This structure will be signed to simulate a provisioning response from the
 // server.
@@ -31,6 +32,15 @@ struct RSAPrivateKeyMessage {
   uint32_t nonce;
 };
 
+// This structure simulates a provisioning 4.0 response from the server.
+// However, OEMCrypto doesn't need to load this response, since it doesn't have
+// any secrets to be handled. It is just a dummy struct for the tests to
+// compile.
+struct Prov40CertMessage {
+  uint8_t device_certificate[kMaxX509CertLength];
+  uint32_t nonce;
+};
+
 // Holds an encryption key and can encrypt a provisioning message.  It also can
 // encrypt short buffers using CBC, such as content keys in a license.
 class Encryptor {