Create dummy key

Android.mk

@@ -12,9 +12,14 @@ LOCAL_CFLAGS += \
 
 LOCAL_SRC_FILES += \
     KeyBuffer.cpp \
-    Keymaster4.cpp
+    Keymaster4.cpp \
+    main.cpp
+
 LOCAL_SHARED_LIBRARIES += \
     [email protected] \
-    libkeymaster4support
+    libbinder \
+    libhidlbase \
+    libkeymaster4support \
+    libutils
 
 include $(BUILD_EXECUTABLE)

main.cpp

@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2020 Erfan Abdi <[email protected]>
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "Keymaster4.h"
+
+/* Maximum allowed keymaster blob size. */
+#define KEYMASTER_BLOB_SIZE 2048
+
+#define RSA_KEY_SIZE 2048
+#define RSA_KEY_SIZE_BYTES (RSA_KEY_SIZE / 8)
+#define RSA_EXPONENT 0x10001
+#define KEYMASTER_CRYPTFS_RATE_LIMIT 1  // Maximum one try per second
+
+int main(int argc, char *argv[]) {
+    unsigned char keymaster_blob[KEYMASTER_BLOB_SIZE];
+    unsigned int keymaster_blob_size = 0;
+    memset(keymaster_blob, 0, KEYMASTER_BLOB_SIZE);
+
+    printf("Generating dummy keypair\n");
+    int rc = keymaster_create_key_for_cryptfs_scrypt(RSA_KEY_SIZE, RSA_EXPONENT, KEYMASTER_CRYPTFS_RATE_LIMIT, keymaster_blob, KEYMASTER_BLOB_SIZE, &keymaster_blob_size);
+    if (rc) {
+        if (keymaster_blob_size > KEYMASTER_BLOB_SIZE) {
+            printf("Keymaster key blob to large\n");
+            keymaster_blob_size = 0;
+        }
+        printf("Failed to generate keypair\n");
+        return -1;
+    }
+	return 0;
+}