// Signature.getInstance
    final Signature signature = Signature.getInstance(JCP.GOST_EL_SIGN_NAME);
    byte[] sign;
    signature.initSign(keys[i]);
    signature.update(data);
    sign = signature.sign();

    signature.initSign(keys[i]);
    signature.update(data);
    sign = signature.sign();

cryptcp -sign -uMy -dn "S.Nazarov" -pin 1234567890 -der init.dat sign.cryptcp.dat -sshttp://cryptopro.ru/tsp/tsp.srf

    private static byte[] getSignature(byte[] data) throws Exception {
        try {
            CMSSignedData sd = new CMSSignedData(data);
            ContentInfo contentInfo = sd.getContentInfo();
            byte[] signature = null;
            Collection c = sd.getSignerInfos().getSigners();
            Iterator i = c.iterator();
            while(i.hasNext()) {
                SignerInformation si = (SignerInformation)i.next();
                SignerInfo info = si.toASN1Structure();
                signature = si.getSignature();
            }
            return signature;
        } catch(CMSException e) {
            e.printStackTrace();
        } catch(IOException e) {
            e.printStackTrace();
        }
        return null;
    }