1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.security.KeyFactory; 25 import java.security.NoSuchAlgorithmException; 26 27 import javax.net.ssl.SSLParameters; 28 29 /* 30 * This class is used for returning some specific JDK information. 31 */ 32 public class JdkUtils { 33 34 public static final String JAVA_RUNTIME_VERSION = "javaRuntimeVersion"; 35 public static final String SUPPORTS_EC_KEY = "supportsECKey"; 36 public static final String SUPPORTS_SNI = "supportsSNI"; 37 public static final String SUPPORTS_ALPN = "supportsALPN"; 38 39 // Returns the JDK build version. 40 public static String javaRuntimeVersion() { 41 return System.getProperty("java.runtime.version"); 42 } 43 44 // Checks if EC key algorithm is supported by the JDK build. 45 private static boolean supportsECKey() { 46 boolean isSupported = true; 47 try { 48 KeyFactory.getInstance("EC"); 49 } catch (NoSuchAlgorithmException e) { 50 isSupported = false; 51 } 52 return isSupported; 53 } 54 55 // Checks if SNI is supported by the JDK build. 56 private static boolean supportsSNI() { 57 boolean isSupported = true; 58 try { 59 SSLParameters.class.getMethod("getServerNames"); 60 } catch (NoSuchMethodException e) { 61 isSupported = false; 62 } 63 return isSupported; 64 } 65 66 // Checks if ALPN is supported by the JDK build. 67 private static boolean supportsALPN() { 68 boolean isSupported = true; 69 try { 70 SSLParameters.class.getMethod("getApplicationProtocols"); 71 } catch (NoSuchMethodException e) { 72 isSupported = false; 73 } 74 return isSupported; 75 } 76 77 public static void main(String[] args) { 78 System.out.print(Utils.join(Utils.PARAM_DELIMITER, 79 attr(JAVA_RUNTIME_VERSION, javaRuntimeVersion()), 80 attr(SUPPORTS_EC_KEY, supportsECKey()), 81 attr(SUPPORTS_SNI, supportsSNI()), 82 attr(SUPPORTS_ALPN, supportsALPN()))); 83 } 84 85 private static String attr(String name, Object value) { 86 return name + "=" + String.valueOf(value); 87 } 88 }