[cm/sign/] with GOST R 34.10-2012.
[cm/pub/gost3410] public keys are used.
=> RFC 7091, GOST R 34.10-2012

GOST R 34.10-2012 must be used with Streebog (GOST R 34.11-2012)
hash function. Its digest must be big-endian serialised. Signature
is in "BE(R)||BE(S)" format.
=> RFC 6986, GOST R 34.11-2012