CertificateFactory cf = CertificateFactory.getInstance("X509");
    InputStream in = null;
    X509CRL crl;
    try{
        in = new FileInputStream("D:\\keys\\crl.crl");
        crl = (X509CRL)cf.generateCRL(in);
    }finally{
        if(in != null) in.close();
    }

    OutputStream out = null;
    try{
        out = new FileOutputStream("D:\\keys\\crl_1.crl");
        out.write(crl.getEncoded());
    }finally{
        if(out != null) out.close();
    }