Random.hxx

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#if !defined(RESIP_RANDOM_HXX)
#define RESIP_RANDOM_HXX 
 
#include "rutil/Mutex.hxx"
#include "rutil/Data.hxx"
#include "rutil/ThreadIf.hxx"     // for ThreadLocalStorage
#include "rutil/ResipAssert.h"
struct random_data;
 
#define RESIP_RANDOM_WIN32_RTL 1
 
// #define RESIP_RANDOM_THREAD_MUTEX 1
 
// #define RESIP_RANDOM_THREAD_LOCAL 1
 
namespace resip
{
 
class Random
{
   public:
      static unsigned getSimpleSeed();
      static void initialize();
 
      enum {maxLength = 512};
      
      static Data getRandom(unsigned int numBytes);
      static Data getRandomHex(unsigned int numBytes); // actual length is 2*numBytes
      static Data getRandomBase64(unsigned int numBytes); // actual length is 1.5*numBytes
 
      static Data getCryptoRandom(unsigned int numBytes);
      static Data getCryptoRandomHex(unsigned int numBytes); // actual length is 2*numBytes
      static Data getCryptoRandomBase64(unsigned int numBytes); // actual length is 1.5*numBytes
 
      static void getCryptoRandom(unsigned char* buf, unsigned int numBytes);
 
      static Data getVersion4UuidUrn();
 
      static int  getRandom();
      static int  getCryptoRandom();
 
      static const char* getImplName();
 
   private:
      static Mutex mMutex;
      static bool  mIsInitialized;
      
#ifdef WIN32
      // ensure each thread is initialized since windows requires you to call srand for each thread
      class Initializer
      {
         public:
            Initializer();
            ~Initializer();
            void setInitialized();
            bool isInitialized();
 
         private:
            DWORD mThreadStorage;
      };
      static Initializer mInitializer;
 
#ifdef RESIP_RANDOM_WIN32_RTL
      static BOOLEAN (APIENTRY *RtlGenRandom)(void*, ULONG);
#endif
#endif  // WIN32
#ifdef RESIP_RANDOM_THREAD_LOCAL
      static ThreadIf::TlsKey sRandomStateKey;
#endif
#ifdef RESIP_RANDOM_THREAD_MUTEX
      static struct random_data* sRandomState;
      // we re-use the initialization mutex
#endif
};
 
}
 
#endif
 
/* ====================================================================
 * The Vovida Software License, Version 1.0 
 * 
 * Copyright (c) 2005.   All rights reserved.
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 * 3. The names "VOCAL", "Vovida Open Communication Application Library",
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 * 4. Products derived from this software may not be called "VOCAL", nor
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 * vi: set shiftwidth=3 expandtab:
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