This is a fairly common operation on an X509. Change-Id: I1820f20b555f75c98ab7e3283b5530bc1c200e2a Reviewed-on: https://boringssl-review.googlesource.com/7611 Reviewed-by: Steven Valdez <svaldez@google.com> Reviewed-by: David Benjamin <davidben@google.com>kris/onging/CECPQ3_patch15