We didn't actually have a test that would have caught
https://github.com/openssl/openssl/issues/19388. This fixes this by
further generalizing the signing tests to run through all combinations
of {new object, reused object} x {X509_sign, X509_set_signature_value}.
In doing so, align X509_REQ_sign and X509_REQ_sign_ctx, which were
missing the TBS invalidation.
Change-Id: I5028aa2a00e71da0ebc7a03b23823b1337a56fca
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/54726
Commit-Queue: Bob Beck <bbe@google.com>
Auto-Submit: David Benjamin <davidben@google.com>
Reviewed-by: Bob Beck <bbe@google.com>
David Benjamin
da96eeb958