public static void main(String[] args) throws Exception {
//csptest -keys -hash GOST -in e:\text -hashout e:\text.hsh
//csptest.exe -keyset -sign GOST -container 111 -in e:\text.hsh -out e:\text.hsh.sign -keytype exchange
    final byte[] buffer = Array.readFile("E:\\text.hsh");
    final byte[] sig = Array.readFile("E:\\text.hsh.sign");
    final CertificateFactory cf = CertificateFactory.getInstance("X509");
    final Certificate cert =
            cf.generateCertificate(new FileInputStream("E:\\111.cer"));
    final PublicKey pub = cert.getPublicKey();
    //var 1
    final Signature sss = Signature.getInstance(JCP.CRYPTOPRO_SIGN_NAME,
            JCP.PROVIDER_NAME);
    sss.initVerify(pub);
    sss.update(buffer);
    final boolean verifies = sss.verify(sig);
    System.out.println("signature verifies: " + verifies);
    if (!verifies) {
        throw new Exception("Signature was not verified");
    }
    //var 2
    final Signature ss = Signature.getInstance(JCP.GOST_EL_SIGN_NAME,
            JCP.PROVIDER_NAME);
    ss.initVerify(pub);
    ss.update(buffer);
    final byte[] invSig = Array.invByteOrderB(sig);
    final boolean verif = ss.verify(invSig);
    System.out.println("signature verifies: " + verif);
    if (!verif) {
        throw new Exception("Signature was not verified");
    }

}