Java tutorial
/** * Copyright 2012, Board of Regents of the University of * Wisconsin System. See the NOTICE file distributed with * this work for additional information regarding copyright * ownership. Board of Regents of the University of Wisconsin * System licenses this file to you under the Apache License, * Version 2.0 (the "License"); you may not use this file * except in compliance with the License. You may obtain a * copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package edu.wisc.doit.tcrypt.controller; import java.io.PrintWriter; import java.security.Key; import java.security.KeyPair; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.bouncycastle.openssl.PEMWriter; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; @Controller public class DownloadController extends BaseController { @RequestMapping("/download") public void downloadKey(@RequestParam("serviceName") String serviceName, @RequestParam("keyType") String keyType, HttpServletRequest request, HttpServletResponse response) throws Exception { try { KeyPair sk = (KeyPair) request.getSession().getAttribute("serviceKey_" + serviceName); response.setContentType("application/x-pem-file"); response.setHeader("Content-Disposition", "attachment; filename=\"" + keyType + "-" + serviceName + ".pem" + "\""); Key key = "private".equalsIgnoreCase(keyType) ? sk.getPrivate() : sk.getPublic(); try (final PEMWriter pemWriter = new PEMWriter(new PrintWriter(response.getOutputStream()))) { pemWriter.writeObject(key); } } catch (Exception e) { logger.error("Issue downloading the key " + keyType, e); throw new Exception(e); } } }