/*

 * 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 *

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package sun.security.ec;

import java.util.*;

import java.security.*;

import sun.security.action.PutAllAction;

/**

 * Provider class for the Elliptic Curve provider.

 * Supports EC keypair and parameter generation, ECDSA signing and

 * ECDH key agreement.

 *

 * IMPLEMENTATION NOTE:

 * The Java classes in this provider access a native ECC implementation

 * via JNI to a C++ wrapper class which in turn calls C functions.

 * The Java classes are packaged into the signed sunec.jar in the JRE

 * extensions directory and the C++ and C functions are packaged into

 * libsunec.so or sunec.dll in the JRE native libraries directory.

 * If the native library is not present then this provider is registered

 * with support for fewer ECC algorithms (KeyPairGenerator, Signature and

 * KeyAgreement are omitted).

 *

 * @since   1.7

 */

public final class SunEC extends Provider {

    private static final long serialVersionUID = -2279741672933606418L;

    // flag indicating whether the full EC implementation is present

    // (when native library is absent then fewer EC algorithms are available)

    private static boolean useFullImplementation = true;

    static {

        try {

            AccessController.doPrivileged(new PrivilegedAction<Void>() {

                public Void run() {

                    System.loadLibrary("sunec"); // check for native library

                    return null;

                }

            });

        } catch (UnsatisfiedLinkError e) {

            useFullImplementation = false;

        }

    }

    public SunEC() {

        // if there is no security manager installed, put directly into

        // the provider. Otherwise, create a temporary map and use a

        // doPrivileged() call at the end to transfer the contents

        if (System.getSecurityManager() == null) {

            SunECEntries.putEntries(this, useFullImplementation);

        } else {

            Map<Object, Object> map = new HashMap<Object, Object>();

            SunECEntries.putEntries(map, useFullImplementation);

            AccessController.doPrivileged(new PutAllAction(this, map));

        }

    }

}