Add GOST R 34.11-2012 implementation (Stribog)
* src/gcrypt.h.in (GCRY_MD_GOSTR3411_12_256) (GCRY_MD_GOSTR3411_12_512): New. * cipher/stribog.c: New. * configure.ac (available_digests_64): Add stribog. * src/cipher.h: Declare Stribog declarations. * cipher/md.c: Register Stribog digest. * tests/basic.c (check_digests) Add 4 testcases for Stribog from standard. * doc/gcrypt.texi: Document new constants.
- Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>