SPHINCS+ support for OpenSSH

[Simon Josefsson]

Hi

I have pushed a (quite preliminary) branch that adds SPHINCS+ SSH
signature support for OpenSSH:

https://github.com/jas4711/openssh-portable/tree/sphincsp

I've written a bit about it here:

https://blog.josefsson.org/2024/12/23/openssh-and-git-on-a-post-quantum-sphincs/

What do you think?

My primary use-case is for ssh-keygen -Y sign/verify usage to protect
Git commits.  It isn't inconceivable that someone would find interactive
SSH use of interest, although I didn't make an effort to test this.

/Simon
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