1 /*
   2  * Copyright (c) 2005, 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 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)) {
  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     // Only can be used in client side to generate TLS RSA premaster secret.
  71     protected SecretKey engineGenerateKey() {
  72         if (spec == null) {
  73             throw new IllegalStateException(
  74                 "TlsRsaPremasterSecretGenerator must be initialized");
  75         }
  76 
  77         if (random == null) {
  78             random = new SecureRandom();
  79         }
  80         byte[] b = new byte[48];
  81         random.nextBytes(b);
  82         b[0] = (byte)spec.getMajorVersion();
  83         b[1] = (byte)spec.getMinorVersion();
  84 
  85         return new SecretKeySpec(b, "TlsRsaPremasterSecret");
  86     }
  87 
  88 }