RSA keygen isn't the fastest. Just use the existing one in rsaCertificate. Change-Id: Icd151232928e67e0a7d5becabf9dc96b0e9bfa22 Reviewed-on: https://boringssl-review.googlesource.com/c/34764 Commit-Queue: Steven Valdez <svaldez@google.com> Reviewed-by: Steven Valdez <svaldez@google.com>kris/onging/CECPQ3_patch15