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    1   /*
    2    * Copyright (c) 2005, 2010, 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 com.sun.crypto.provider;
   27   
   28   import java.security;
   29   import java.security.spec.AlgorithmParameterSpec;
   30   
   31   import javax.crypto;
   32   import javax.crypto.spec.SecretKeySpec;
   33   
   34   import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec;
   35   
   36   /**
   37    * KeyGenerator implementation for the SSL/TLS RSA premaster secret.
   38    *
   39    * @author  Andreas Sterbenz
   40    * @since   1.6
   41    */
   42   public final class TlsRsaPremasterSecretGenerator extends KeyGeneratorSpi {
   43   
   44       private final static String MSG = "TlsRsaPremasterSecretGenerator must be "
   45           + "initialized using a TlsRsaPremasterSecretParameterSpec";
   46   
   47       private TlsRsaPremasterSecretParameterSpec spec;
   48       private SecureRandom random;
   49   
   50       public TlsRsaPremasterSecretGenerator() {
   51       }
   52   
   53       protected void engineInit(SecureRandom random) {
   54           throw new InvalidParameterException(MSG);
   55       }
   56   
   57       protected void engineInit(AlgorithmParameterSpec params,
   58               SecureRandom random) throws InvalidAlgorithmParameterException {
   59           if (params instanceof TlsRsaPremasterSecretParameterSpec == false) {
   60               throw new InvalidAlgorithmParameterException(MSG);
   61           }
   62           this.spec = (TlsRsaPremasterSecretParameterSpec)params;
   63           this.random = random;
   64       }
   65   
   66       protected void engineInit(int keysize, SecureRandom random) {
   67           throw new InvalidParameterException(MSG);
   68       }
   69   
   70       protected SecretKey engineGenerateKey() {
   71           if (spec == null) {
   72               throw new IllegalStateException(
   73                   "TlsRsaPremasterSecretGenerator must be initialized");
   74           }
   75           if (random == null) {
   76               random = new SecureRandom();
   77           }
   78           byte[] b = new byte[48];
   79           random.nextBytes(b);
   80           b[0] = (byte)spec.getMajorVersion();
   81           b[1] = (byte)spec.getMinorVersion();
   82           return new SecretKeySpec(b, "TlsRsaPremasterSecret");
   83       }
   84   
   85   }

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