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    1   /*
    2    * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package sun.security.ec;
   27   
   28   import java.util;
   29   import java.security;
   30   import sun.security.action.PutAllAction;
   31   
   32   /**
   33    * Provider class for the Elliptic Curve provider.
   34    * Supports EC keypair and parameter generation, ECDSA signing and
   35    * ECDH key agreement.
   36    *
   37    * IMPLEMENTATION NOTE:
   38    * The Java classes in this provider access a native ECC implementation
   39    * via JNI to a C++ wrapper class which in turn calls C functions.
   40    * The Java classes are packaged into the signed sunec.jar in the JRE
   41    * extensions directory and the C++ and C functions are packaged into
   42    * libsunec.so or sunec.dll in the JRE native libraries directory.
   43    * If the native library is not present then this provider is registered
   44    * with support for fewer ECC algorithms (KeyPairGenerator, Signature and
   45    * KeyAgreement are omitted).
   46    *
   47    * @since   1.7
   48    */
   49   public final class SunEC extends Provider {
   50   
   51       private static final long serialVersionUID = -2279741672933606418L;
   52   
   53       // flag indicating whether the full EC implementation is present
   54       // (when native library is absent then fewer EC algorithms are available)
   55       private static boolean useFullImplementation = true;
   56       static {
   57           try {
   58               AccessController.doPrivileged(new PrivilegedAction<Void>() {
   59                   public Void run() {
   60                       System.loadLibrary("sunec"); // check for native library
   61                       return null;
   62                   }
   63               });
   64           } catch (UnsatisfiedLinkError e) {
   65               useFullImplementation = false;
   66           }
   67       }
   68   
   69       public SunEC() {
   70           super("SunEC", 1.7d, "Sun Elliptic Curve provider (EC, ECDSA, ECDH)");
   71   
   72           // if there is no security manager installed, put directly into
   73           // the provider. Otherwise, create a temporary map and use a
   74           // doPrivileged() call at the end to transfer the contents
   75           if (System.getSecurityManager() == null) {
   76               SunECEntries.putEntries(this, useFullImplementation);
   77           } else {
   78               Map<Object, Object> map = new HashMap<Object, Object>();
   79               SunECEntries.putEntries(map, useFullImplementation);
   80               AccessController.doPrivileged(new PutAllAction(this, map));
   81           }
   82       }
   83   
   84   }

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