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It was not possible to check gostdsa_vko test vectors with the outputs
from RFC 7836 because Nettle lacked Streebog hash function. Now as the
function is supported, add full test vectors.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>

Add test vectors from R 50.1.111-2016 to verify using HMAC-STREEBOG in
PBKDF2 function.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>

Add support for calculating HMAC using Streebog hash functions.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>

Add a testuite for Streebog hash function. Test vectors are based on RFC
6986.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>

Also add nettle_streebog256 and nettle_streebog512 to nettle meta interface.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>

The direct $HASH_{Init,Update,Final} has been discouraged for a while.
With the upcoming OpenSSL 3.0 it will be officially deprecated.

Add a handy macro, to avoid repetition and mistakes like in the current
code. Namely - we're using SHA cblock/digest_len for md5 :-\

The macro will also make it easier to add more, as seen with next patch.

v2: Align it with the crypto implementations, namely:
 - use openssh_hash_ctx::evp, use correct sizeof()
 - move hash_update out of the macro
 - remove forward declarations for hash functions
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>

Make low-level poly1305 functions that were marked as "internal" in
public header file really internal. Change their prefix from nettle to
_nettle.
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>