1 /*
   2  * Copyright (c) 2009, 2014, 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 jdk.crypto.sunec module and the
  41  * C++ and C functions are packaged into libsunec.so or sunec.dll in the
  42  * JRE native libraries directory.  If the native library is not present
  43  * then this provider is registered with support for fewer ECC algorithms
  44  * (KeyPairGenerator, Signature and KeyAgreement are omitted).
  45  *
  46  * @since   1.7
  47  */
  48 public final class SunEC extends Provider {
  49 
  50     private static final long serialVersionUID = -2279741672933606418L;
  51 
  52     // flag indicating whether the full EC implementation is present
  53     // (when native library is absent then fewer EC algorithms are available)
  54     private static boolean useFullImplementation = true;
  55     static {
  56         try {
  57             AccessController.doPrivileged(new PrivilegedAction<Void>() {
  58                 public Void run() {
  59                     System.loadLibrary("sunec"); // check for native library
  60                     return null;
  61                 }
  62             });
  63         } catch (UnsatisfiedLinkError e) {
  64             useFullImplementation = false;
  65         }
  66     }
  67 
  68     public SunEC() {
  69         super("SunEC", 1.9d, "Sun Elliptic Curve provider (EC, ECDSA, ECDH)");
  70 
  71         // if there is no security manager installed, put directly into
  72         // the provider. Otherwise, create a temporary map and use a
  73         // doPrivileged() call at the end to transfer the contents
  74         if (System.getSecurityManager() == null) {
  75             SunECEntries.putEntries(this, useFullImplementation);
  76         } else {
  77             Map<Object, Object> map = new HashMap<Object, Object>();
  78             SunECEntries.putEntries(map, useFullImplementation);
  79             AccessController.doPrivileged(new PutAllAction(this, map));
  80         }
  81     }
  82 
  83 }