diff --git a/verifier_test.cpp b/verifier_test.cpp
index 01d0926..79c5578 100644
--- a/verifier_test.cpp
+++ b/verifier_test.cpp
@@ -129,21 +129,26 @@
 };
 
 int main(int argc, char **argv) {
-    if (argc != 2 && argc != 3) {
-        fprintf(stderr, "Usage: %s [-f4] <package>\n", argv[0]);
+    if (argc < 2 || argc > 4) {
+        fprintf(stderr, "Usage: %s [-f4 | -file <keys>] <package>\n", argv[0]);
         return 2;
     }
 
     RSAPublicKey* key = &test_key;
+    int num_keys = 1;
     ++argv;
     if (strcmp(argv[0], "-f4") == 0) {
         ++argv;
         key = &test_f4_key;
+    } else if (strcmp(argv[0], "-file") == 0) {
+        ++argv;
+        key = load_keys(argv[0], &num_keys);
+        ++argv;
     }
 
     ui = new FakeUI();
 
-    int result = verify_file(*argv, key, 1);
+    int result = verify_file(*argv, key, num_keys);
     if (result == VERIFY_SUCCESS) {
         printf("SUCCESS\n");
         return 0;