Support for SHA2 HMAC algorithms

[Dirkjan Bussink <d.bussink@xxxxxxxxx>]

Hi all,

I’ve written a patch that adds support to libssh for SHA2 HMAC algorithms. Newer versions of OpenSSH are disabling SHA1 as the default, so it would be good to be prepared here for this future.

http://www.openssh.com/cgi-bin/man.cgi?query=sshd_config

The default is:

umac-64-etm@xxxxxxxxxxx,umac-128-etm@xxxxxxxxxxx,                   
hmac-sha2-256-etm@xxxxxxxxxxx,hmac-sha2-512-etm@xxxxxxxxxxx,
umac-64@xxxxxxxxxxx,umac-128@xxxxxxxxxxx,
hmac-sha2-256,hmac-sha2-512

If this patch needs any changes to be accepted, please let me know.

— 
Dirkjan Bussink

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