[Cryptech Tech] need SHA-224 support

[Francis Dupont]

Today only 5 from the 6 SHA-2 algorithms are supported: there is no
support for SHA-224 which is used by TSIG (cf RFC 4635) when
the almost useless SHA-512/224 is supported...
Can you consider this message as a formal request to add SHA-224 support?

Thanks

Francis.Dupont at fdupont.fr

PS: this is trivial for the libhal mixed-mode code, a bit harder for
the core code but you already have SHA-384 which is pretty similar.