diff --git a/mock_certificate_checker.h b/mock_certificate_checker.h
new file mode 100644
index 0000000..c86f502
--- /dev/null
+++ b/mock_certificate_checker.h
@@ -0,0 +1,38 @@
+//
+// Copyright (C) 2011 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef UPDATE_ENGINE_MOCK_CERTIFICATE_CHECKER_H_
+#define UPDATE_ENGINE_MOCK_CERTIFICATE_CHECKER_H_
+
+#include <gmock/gmock.h>
+#include <openssl/ssl.h>
+
+#include "update_engine/certificate_checker.h"
+
+namespace chromeos_update_engine {
+
+class MockOpenSSLWrapper : public OpenSSLWrapper {
+ public:
+  MOCK_CONST_METHOD4(GetCertificateDigest,
+                     bool(X509_STORE_CTX* x509_ctx,
+                          int* out_depth,
+                          unsigned int* out_digest_length,
+                          uint8_t* out_digest));
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_MOCK_CERTIFICATE_CHECKER_H_