Add vbutil_keyblock

host/lib/host_misc.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Host functions for verified boot.
  */
 
 /* TODO: change all 'return 0', 'return 1' into meaningful return codes */
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #include "host_common.h"
 
 #include "cryptolib.h"
 #include "utility.h"
 #include "vboot_common.h"
 
 
 uint8_t* ReadFile(const char* filename, uint64_t* size) {
   FILE* f;
@@ skipping 18 matching lines @@
   if(1 != fread(buf, *size, 1, f)) {
     debug("Unable to read from file %s\n", filename);
     fclose(f);
     Free(buf);
     return NULL;
   }
 
   fclose(f);
   return buf;
 }
+
+
+int WriteFile(const char* filename, const void *data, uint64_t size) {
+  FILE *f = fopen(filename, "wb");
+  if (!f) {
+    debug("Unable to open file %s\n", filename);
+    return 1;
+  }
+
+  if (1 != fwrite(data, size, 1, f)) {
+    debug("Unable to write to file %s\n", filename);
+    fclose(f);
+    unlink(filename);  /* Delete any partial file */
+  }
+
+  fclose(f);
+  return 0;
+}