src/java.base/share/classes/sun/security/provider/VerificationProvider.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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package sun.security.provider;

import java.util.*;
import java.security.*;

import sun.security.rsa.SunRsaSignEntries;
import static sun.security.util.SecurityConstants.PROVIDER_VER;


/**
 * Provider used for verification of signed JAR files *if* the Sun and
 * SunRsaSign main classes have been removed. Otherwise, this provider is not
 * necessary and registers no algorithms. This functionality only exists to
 * support a use case required by a specific customer and is not generally
 * supported.
 *
 * @since  1.7
 * @author Andreas Sterbenz
 */
public final class VerificationProvider extends Provider {

    @java.io.Serial
    private static final long serialVersionUID = 7482667077568930381L;

    private static final boolean ACTIVE;

    static {
        boolean b;
        try {
            Class.forName("sun.security.provider.Sun");
            Class.forName("sun.security.rsa.SunRsaSign");
            b = false;
        } catch (ClassNotFoundException e) {
            b = true;
        }
        ACTIVE = b;
    }

    public VerificationProvider() {
        super("SunJarVerification", PROVIDER_VER, "Jar Verification Provider");
        // register all algorithms normally registered by the Sun and SunRsaSign
        // providers, but only if they are missing
        if (ACTIVE == false) {
            return;
        }

        Provider p = this;
        Iterator<Provider.Service> sunIter = new SunEntries(p).iterator();
        Iterator<Provider.Service> rsaIter =
            new SunRsaSignEntries(p).iterator();

        putEntries(sunIter);
        putEntries(rsaIter);
    }

    void putEntries(Iterator<Provider.Service> i) {
        while (i.hasNext()) {
            putService(i.next());
        }
    }

}