Add vbutil_keyblock

host/lib/host_misc.c

Index: host/lib/host_misc.c
diff --git a/host/lib/host_misc.c b/host/lib/host_misc.c
index f24bf40dc0159973848e872c7749a215642b3ee9..2620df7a98e444ebdd3e96e20277019c112768c5 100644
--- a/host/lib/host_misc.c
+++ b/host/lib/host_misc.c
@@ -9,6 +9,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #include "host_common.h"
 
@@ -47,3 +48,21 @@ uint8_t* ReadFile(const char* filename, uint64_t* size) {
   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;
+}