I could really use this sooner than later... and sometimes having a full-featured (or even secure) interface is not what you want.

Consider zmap and masscan etc and ssl mapping (similar to what the EFF did a couple years back - https://www.eff.org/observatory - but with the full chain instead of just the cert). The desire here would be low level, low overhead, no validation on the fly: All you want is the cert chain.

There are plenty of research and security applications where a simple wrapper around OpenSSL that returns DER bytes would be desirable. Please reconsider this patch for inclusion in 3.4 ...