* 34.11-2012 is split on two different modules: gost34112012256 and
gost34112012512
* 34.11-94's digest is reversed. Now it is compatible with TC26's
HMAC and PBKDF2 test vectors
* gogost-streebog is split to streebog256 and streebog512
correspondingly by analogy with sha* utilities
* added VKO 34.10-2012 support with corresponding test vectors
* gost3410.DigestSizeX is renamed to gost3410.ModeX because it is
not related to digest size, but parameters and key sizes
* KEK functions take big.Int UKM value. Use NewUKM to unmarshal
raw binary UKM
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