digestOidValue = JCP.GOST_DIGEST_2012_512_OID;
signOidValue = JCP.GOST_SIGN_2012_512_OID;
final SignedData cms = new SignedData();
cms.signerInfos.elements[0].digestAlgorithm = new DigestAlgorithmIdentifier(new OID(digestOidValue).value);
cms.signerInfos.elements[0].digestAlgorithm.parameters = new Asn1Null();
cms.signerInfos.elements[0].signatureAlgorithm = new SignatureAlgorithmIdentifier(new OID(signOidValue).value);
cms.signerInfos.elements[0].signatureAlgorithm.parameters = new Asn1Null();

       final Asn1Type messageDigest = new Asn1OctetString(messageDigestBlob);
       cms.signerInfos.elements[0].signedAttrs.elements[1].values.elements[0] = messageDigest;

       // signature
       Asn1BerEncodeBuffer encBufSignedAttr = new Asn1BerEncodeBuffer();
       cms.signerInfos.elements[0].signedAttrs.encode(encBufSignedAttr);
        final java.security.Signature signature = java.security.Signature.getInstance(signAlg, providerName);
        byte[] sign;
        final byte[] hSign = encBufSignedAttr.getMsgCopy();
        signature.initSign(pk);
        signature.update(hSign);
        sign = signature.sign();
        cms.signerInfos.elements[0].signature = new SignatureValue(sign);
        // encode
        final Asn1BerEncodeBuffer asn1Buf = new Asn1BerEncodeBuffer();
        all.encode(asn1Buf, true);