CryptographicRandomNumber.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2004 Vintela, Inc. All rights reserved.
00003 * Copyright (C) 2005 Novell, Inc. All rights reserved.
00004 *
00005 * Redistribution and use in source and binary forms, with or without
00006 * modification, are permitted provided that the following conditions are met:
00007 *
00008 *  - Redistributions of source code must retain the above copyright notice,
00009 *    this list of conditions and the following disclaimer.
00010 *
00011 *  - Redistributions in binary form must reproduce the above copyright notice,
00012 *    this list of conditions and the following disclaimer in the documentation
00013 *    and/or other materials provided with the distribution.
00014 *
00015 *  - Neither the name of Vintela, Inc., Novell, Inc., nor the names of its
00016 *    contributors may be used to endorse or promote products derived from this
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00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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00031 
00037 #ifndef BLOCXX_CRYPTOGRAPHIC_RANDOM_NUMBER_HPP_INCLUDE_GUARD_
00038 #define BLOCXX_CRYPTOGRAPHIC_RANDOM_NUMBER_HPP_INCLUDE_GUARD_
00039 #include "blocxx/BLOCXX_config.h"
00040 #include "blocxx/Exception.hpp"
00041 
00042 namespace BLOCXX_NAMESPACE
00043 {
00044 
00045 BLOCXX_DECLARE_APIEXCEPTION(CryptographicRandomNumber, BLOCXX_COMMON_API);
00046 
00047 } // end namespace BLOCXX_NAMESPACE
00048 
00049 #if defined(BLOCXX_HAVE_OPENSSL)
00050 #include "blocxx/Types.hpp"
00051 
00052 #include <stdlib.h> // for RAND_MAX
00053 
00054 namespace BLOCXX_NAMESPACE
00055 {
00056 
00061 class BLOCXX_COMMON_API CryptographicRandomNumber
00062 {
00063 public:
00064 
00071    CryptographicRandomNumber(Int32 lowVal = 0, Int32 highVal = RAND_MAX);
00072 
00079    Int32 getNextNumber();
00080    
00081 public:
00082 
00091    static void initRandomness();
00092 
00096    static void saveRandomState();
00097 
00098 private:
00099    Int32 m_lowVal;
00100    Int32 m_highVal;
00101    Int32 m_range;
00102    int m_numBits;
00103 };
00104 
00105 } // end namespace BLOCXX_NAMESPACE
00106 
00107 #else
00108 
00109 // no openssl, so just typedef the class to RandomNumber
00110 #include "blocxx/RandomNumber.hpp"
00111 
00112 namespace BLOCXX_NAMESPACE
00113 {
00114 
00115 typedef RandomNumber CryptographicRandomNumber;
00116 
00117 } // end namespace BLOCXX_NAMESPACE
00118 
00119 #endif // #if defined(BLOCXX_HAVE_OPENSSL)
00120 
00121 #endif
00122 

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