88 lines
3.3 KiB
Java
88 lines
3.3 KiB
Java
/*
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* Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.security.KeyPairGenerator;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.security.Signature;
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import static java.util.Arrays.asList;
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/*
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* This class is used for returning some specific JDK information.
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*/
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public class JdkUtils {
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private enum Alg {
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KEY, SIG, DIGEST;
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}
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static final String M_JAVA_VERSION = "javaVersion";
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static final String M_JAVA_RUNTIME_VERSION = "javaRuntimeVersion";
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static final String M_IS_SUPPORTED_KEYALG = "isSupportedKeyalg";
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static final String M_IS_SUPPORTED_SIGALG = "isSupportedSigalg";
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static final String M_IS_SUPPORTED_DIGESTALG = "isSupportedDigestalg";
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// Returns the JDK build version.
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static String javaVersion() {
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return System.getProperty("java.version");
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}
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// Returns the JDK build runtime version.
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static String javaRuntimeVersion() {
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return System.getProperty("java.runtime.version");
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}
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// Checks if the specified algorithm is supported by the JDK.
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static boolean isSupportedAlg(Alg algType, String algName) {
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try {
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switch (algType) {
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case KEY:
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return KeyPairGenerator.getInstance(algName) != null;
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case SIG:
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return Signature.getInstance(algName) != null;
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case DIGEST:
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return MessageDigest.getInstance(algName) != null;
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}
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} catch (NoSuchAlgorithmException e) { }
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System.out.println(algName + " is not supported yet.");
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return false;
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}
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public static void main(String[] args) {
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if (M_JAVA_VERSION.equals(args[0])) {
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System.out.print(javaVersion());
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} else if (M_JAVA_RUNTIME_VERSION.equals(args[0])) {
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System.out.print(javaRuntimeVersion());
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} else if (M_IS_SUPPORTED_KEYALG.equals(args[0])) {
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System.out.print(isSupportedAlg(Alg.KEY, args[1]));
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} else if (M_IS_SUPPORTED_SIGALG.equals(args[0])) {
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System.out.print(isSupportedAlg(Alg.SIG, args[1]));
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} else if (M_IS_SUPPORTED_DIGESTALG.equals(args[0])) {
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System.out.print(isSupportedAlg(Alg.DIGEST, args[1]));
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} else {
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throw new IllegalArgumentException("invalid: " + asList(args));
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}
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}
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}
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