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.NoSuchAlgorithmException; 25 import java.security.Signature; 26 27 /* 28 * This class is used for returning some specific JDK information. 29 */ 30 public class JdkUtils { 31 32 static final String M_JAVA_RUNTIME_VERSION = "javaRuntimeVersion"; 33 static final String M_IS_SUPPORTED_SIGALG = "isSupportedSigalg"; 34 35 // Returns the JDK build version. 36 static String javaRuntimeVersion() { 37 return System.getProperty("java.runtime.version"); 38 } 39 40 // Checks if the specified signature algorithm is supported by the JDK. 41 static boolean isSupportedSigalg(String sigalg) { 42 boolean isSupported = false; 43 try { 44 isSupported = Signature.getInstance(sigalg) != null; 45 } catch (NoSuchAlgorithmException e) { } 46 47 if (!isSupported) { 48 System.out.println(sigalg + " is not supported yet."); 49 } 50 51 return isSupported; 52 } 53 54 public static void main(String[] args) { 55 if (M_JAVA_RUNTIME_VERSION.equals(args[0])) { 56 System.out.print(javaRuntimeVersion()); 57 } else if (M_IS_SUPPORTED_SIGALG.equals(args[0])) { 58 System.out.print(isSupportedSigalg(args[1])); 59 } 60 } 61 }