Modifying the kernel_utility tool to create our magic blob.

src/platform/vboot_reference/vboot_firmware/include/utility.h

Index: src/platform/vboot_reference/vboot_firmware/include/utility.h
diff --git a/src/platform/vboot_reference/vboot_firmware/include/utility.h b/src/platform/vboot_reference/vboot_firmware/include/utility.h
index a5df8fa6babed28bf37131902666767a84a85a7e..e4d9aa38337fee818a08cdf8deabe922b96b9587 100644
--- a/src/platform/vboot_reference/vboot_firmware/include/utility.h
+++ b/src/platform/vboot_reference/vboot_firmware/include/utility.h
@@ -85,4 +85,15 @@ void* StatefulMemcpy(MemcpyState* state, void* dst, uint64_t len);
  */
 const void* StatefulMemcpy_r(MemcpyState* state, const void* src, uint64_t len);
 
+/* Like StatefulMemcpy_r() but fills a portion of the encapsulated buffer with
+ * a constant value.
+ * On success, return a meaningless but non-NULL pointer and updates [state].
+ * On failure, return NULL, set remaining_len in state to -1.
+ *
+ * After the first failure (buffer overrun), successive calls will always fail.
+ */
+const void* StatefulMemset_r(MemcpyState* state, const uint8_t val,
+                             uint64_t len);
+
+
 #endif  /* VBOOT_REFERENCE_UTILITY_H_ */