[cm/signed/] 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

Its /sigs/*/sign contents:
    sign-gost3410-256A {
        {field . {map}}
        {field a {str} =gost3410-256A}
        {field v {bin} len=64}
    }
    
    sign-gost3410-512C {
        {field . {map}}
        {field a {str} =gost3410-512C}
        {field v {bin} len=128}
    }
    
    sign-gost3410-256A-merkle {
        {field . {map}}
        {field a {str} =gost3410-256A-merkle}
        {field v {bin} len=64}
    }
    
    sign-gost3410-512C-merkle {
        {field . {map}}
        {field a {str} =gost3410-512C-merkle}
        {field v {bin} len=128}
    }