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Java example source code file (TestSignatures.java)

This example Java source code file (TestSignatures.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

exception, file, fileinputstream, keyfactory, keystore, md5withrsa, privatekey, publickey, rsapublickey, security, sha224withrsa, sha256withrsa, string, testsignatures, util, verification

The TestSignatures.java Java example source code

/*
 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/**
 * @test
 * @bug 4856966
 * @summary Test signing/verifying using all the signature algorithms
 * @author Andreas Sterbenz
 * @library ..
 */

import java.io.*;
import java.util.*;

import java.security.*;
import java.security.interfaces.*;

public class TestSignatures extends PKCS11Test {

    private final static String BASE = System.getProperty("test.src", ".");

    private static final char[] password = "test12".toCharArray();

    private static Provider provider;

    private static byte[] data;

    static KeyStore getKeyStore() throws Exception {
        InputStream in = new FileInputStream(new File(BASE, "rsakeys.ks"));
        KeyStore ks = KeyStore.getInstance("JKS");
        ks.load(in, password);
        in.close();
        return ks;
    }

    private static void testSignature(String algorithm, PrivateKey privateKey, PublicKey publicKey) throws Exception {
        System.out.println("Testing " + algorithm + "...");
        Signature s = Signature.getInstance(algorithm, provider);
        s.initSign(privateKey);
        s.update(data);
        byte[] sig = s.sign();
        s.initVerify(publicKey);
        s.update(data);
        boolean result;
        result = s.verify(sig);
        if (result == false) {
            throw new Exception("Verification 1 failed");
        }
        s.update(data);
        result = s.verify(sig);
        if (result == false) {
            throw new Exception("Verification 2 failed");
        }
        result = s.verify(sig);
        if (result == true) {
            throw new Exception("Verification 3 succeeded");
        }
    }

    private static void test(PrivateKey privateKey, PublicKey publicKey) throws Exception {
        testSignature("MD2withRSA", privateKey, publicKey);
        testSignature("MD5withRSA", privateKey, publicKey);
        testSignature("SHA1withRSA", privateKey, publicKey);
        testSignature("SHA224withRSA", privateKey, publicKey);
        testSignature("SHA256withRSA", privateKey, publicKey);
        RSAPublicKey rsaKey = (RSAPublicKey)publicKey;
        if (rsaKey.getModulus().bitLength() > 512) {
            // for SHA384 and SHA512 the data is too long for 512 bit keys
            testSignature("SHA384withRSA", privateKey, publicKey);
            testSignature("SHA512withRSA", privateKey, publicKey);
        }
    }

    public static void main(String[] args) throws Exception {
        main(new TestSignatures());
    }

    public void main(Provider p) throws Exception {
        long start = System.currentTimeMillis();
        provider = p;
        data = new byte[2048];
        new Random().nextBytes(data);
        KeyStore ks = getKeyStore();
        KeyFactory kf = KeyFactory.getInstance("RSA", provider);
        for (Enumeration e = ks.aliases(); e.hasMoreElements(); ) {
            String alias = (String)e.nextElement();
            if (ks.isKeyEntry(alias)) {
                System.out.println("* Key " + alias + "...");
                PrivateKey privateKey = (PrivateKey)ks.getKey(alias, password);
                PublicKey publicKey = ks.getCertificate(alias).getPublicKey();
                privateKey = (PrivateKey)kf.translateKey(privateKey);
                publicKey = (PublicKey)kf.translateKey(publicKey);
                test(privateKey, publicKey);
            }
        }
        long stop = System.currentTimeMillis();
        System.out.println("All tests passed (" + (stop - start) + " ms).");
    }
}

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