Add vbutil_key

vboot_firmware/lib/include/vboot_struct.h

Index: vboot_firmware/lib/include/vboot_struct.h
diff --git a/vboot_firmware/lib/include/vboot_struct.h b/vboot_firmware/lib/include/vboot_struct.h
index 9957e462b98cd38a9d516acded5382b9b94fa862..c77fa4bc747802965521d087fa12861ce4fa4f7f 100644
--- a/vboot_firmware/lib/include/vboot_struct.h
+++ b/vboot_firmware/lib/include/vboot_struct.h
@@ -26,7 +26,7 @@ typedef struct VbPublicKey {
 typedef struct VbSignature {
   uint64_t sig_offset;  /* Offset of signature data from start of this
                          * struct */
-  uint64_t sig_size;    /* Size of signature data from start of this struct */
+  uint64_t sig_size;    /* Size of signature data in bytes */
   uint64_t data_size;   /* Size of the data block which was signed in bytes */
 } VbSignature;