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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
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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
 * 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).
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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/**
 * 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() {
        super("SunEC", 1.8d, "Sun Elliptic Curve provider (EC, ECDSA, ECDH)");

        // 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));
        }
    }

}