public static PrivateKey getPrivateKey(String privateKeyPath) throws FileNotFoundException, IOException, NoSuchAlgorithmException {
        //String keyPath = "/home/me/Documents/ИЭМК/x509_OpenSSL_13.01.2014/key.pem";
        BufferedReader br = new BufferedReader(new FileReader(privateKeyPath));
        Security.addProvider(new BouncyCastleProvider());
        KeyPair kp = (KeyPair) new PEMReader(br, new PasswordFinder() {
            @Override
            public char[] getPassword() {
                return "password".toCharArray();
            }
        }).readObject();
        PrivateKey aPrivate = kp.getPrivate();
        //samlResponse.sign(Signature.getInstance("SHA1withRSA").toString(), kp.getPrivate(), certs);
        return aPrivate;
    }

    public static byte[] sign2(byte[] text, String privateKeyPath) throws NoSuchAlgorithmException, InvalidKeyException, SignatureException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, FileNotFoundException, IOException {
        PrivateKey privateKey = getPrivateKey(privateKeyPath);
// Compute signature
        Signature instance = Signature.getInstance("SHA1withRSA");
        instance.initSign(privateKey);
        instance.update(text);
        byte[] signature = instance.sign();
        //verify(text, signature, "/home/me/SVN/branches/Nikita/HL7CDA/7.3.1/SocketDebug/z2/selfsigned.crt");
        return signature;
    }

            try {
                final CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
                final Collection<? extends Certificate> certs =
                        (Collection<? extends Certificate>) certFactory.generateCertificates(new FileInputStream(new File(certPath)));
                Iterator<? extends Certificate> certIterator = certs.iterator();

                while (certIterator.hasNext()) {
                    Certificate cert = certIterator.next();
                    System.out.println("Certificate information:");
                    System.out.println(cert.toString());
                    System.out.println("------------------------");
                    Signature signature = Signature.getInstance("SHA1withRSA");
                    signature.initVerify(cert);
                    signature.update(message);
                    boolean verify = signature.verify(sign);
                    if (verify) {
                        System.out.println("Verify status: Success");
                        System.out.println();
                    } else {
                        System.out.println("Verify status: Failed");
                        System.out.println();
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }