Howto use libgrcypt for signature?

[Stef Bon]

Aha thanks! That helps a lot!

How does the struct struct rsa_sigver_data look like? I see the values
e and n which from the publickey,
but I only have the publickey as one string as part of the
SSH_MSG_KEXDH_REPLY message.
I'v read rfc4253 6.6 and find sit hard to understand.
Can I use the rsa hostkey just as string or do I have to get the e and
the n from it?

Stef Bon

BTW I want to try the libkcapi as backend library when everything
works. I've read you've written it.
Are there any indications this library performs better?