Remove HAVE_ED25519 guard. It should be commonplace enough by now

Some minor tweaks on previous

Adjust for new libopensmtpd

Revert __func__

Simplify quite a bit by disposing of int return types now that malloc failures are fatal.

Use dkim_signature_printf directly inside dkim_signature_printheader

s/\<header\>/line/g for dkim_signature_printheader. This makes the nomanclature more in line with reality

make dkim_signature_printheader always do the alloc/free dance. This simplifies the code quite a bit

System level errors should be fatal

Skip commented and empty lines

Revert previous. It's too early to remove the guards just yet.

Remove HAVE_ED25519 now that we have ED25519 in LibreSSL

Implement -D file as an easy way to manage multiple domains. Requested by Mischa Peters and Renaud Allard

Clean up some memory leaks in error paths Found/inspired by Peter J Philipp

Fix a few cosmetic signedness warnings. There's still one left for tmp, but that needs a little more attention.

Fix a couple of hangs on error paths.

Add support for ed25519. This must be enabled at compile-time, since LibreSSL currently doesn't support this algorithm. Still builds with older LibreSSL versions. Lots of help tb@

Do a little better error handling in dkim_message_new

Fix a couple dkim_err vs dkim_errx issues"

Allow to build on Debian

cast now to long long for portability

Plug a minor memory leak

Add support for multiple -d flags. Needs a lot more testing.

Make dkim_err print errno string

If we're in error mode, make sure we still print the closing dot