verifier: update to support certificates using SHA-256

(cherry picked from commit bac7fba02763ae5e78e8e4ba0bea727330ad953e)

Change-Id: I01c38d7fea088622a8b0bbf2c833fa2d969417af
diff --git a/install.cpp b/install.cpp
index 0f3298f..0cb5cc7 100644
--- a/install.cpp
+++ b/install.cpp
@@ -190,7 +190,7 @@
     ui->Print("Opening update package...\n");
 
     int numKeys;
-    RSAPublicKey* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
+    Certificate* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
     if (loadedKeys == NULL) {
         LOGE("Failed to load keys\n");
         return INSTALL_CORRUPT;