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/*************************************************
* Default Initialization Function Source File    *
* (C) 1999-2006 The Botan Project                *
*************************************************/

#include <botan/init.h>
#include <botan/libstate.h>
#include <botan/modules.h>
#include <botan/conf.h>
#include <botan/defalloc.h>
#include <botan/fips140.h>
#include <botan/x931_rng.h>
#include <botan/def_char.h>

namespace Botan {

/*************************************************
* Library Initialization                         *
*************************************************/
LibraryInitializer::LibraryInitializer(const std::string& arg_string)
   {
   Init::initialize(arg_string);
   }

/*************************************************
* Library Shutdown                               *
*************************************************/
LibraryInitializer::~LibraryInitializer()
   {
   Init::deinitialize();
   }

namespace Init {

/*************************************************
* Library Initialization                         *
*************************************************/
void initialize(const std::string& arg_string)
   {
   InitializerOptions args(arg_string);
   Builtin_Modules modules;

   Mutex_Factory* mutex_factory = 0;

   if(args.thread_safe())
      {
      mutex_factory = modules.mutex_factory();
      if(!mutex_factory)
         throw Exception("LibraryInitializer: thread safety impossible");
      }

   set_global_state(new Library_State(mutex_factory));

   global_state().set_timer(modules.timer());

   std::vector<Allocator*> allocators = modules.allocators();
   for(u32bit j = 0; j != allocators.size(); ++j)
      global_state().add_allocator(allocators[j]);

   if(args.config_file() != "")
      Config::load(args.config_file(), global_state());

   std::vector<Engine*> engines = modules.engines();
   for(u32bit j = 0; j != engines.size(); ++j)
      global_state().add_engine(engines[j]);

   global_state().set_transcoder(new Default_Charset_Transcoder);

   global_state().set_prng(new ANSI_X931_RNG);
   std::vector<EntropySource*> sources = modules.entropy_sources();
   for(u32bit j = 0; j != sources.size(); ++j)
      global_state().add_entropy_source(sources[j], true);

   const u32bit min_entropy = Config::get_u32bit("rng/min_entropy");

   if(min_entropy != 0 && args.seed_rng())
      {
      u32bit total_bits = 0;
      for(u32bit j = 0; j != 4; ++j)
         {
         total_bits += global_state().seed_prng(true,
                                                min_entropy - total_bits);
         if(total_bits >= min_entropy)
            break;
         }

      if(total_bits < min_entropy)
         throw PRNG_Unseeded("Unable to collect sufficient entropy");
      }

   if(!FIPS140::passes_self_tests())
      {
      set_global_state(0);
      throw Self_Test_Failure("FIPS-140 startup tests");
      }
   }

/*************************************************
* Library Shutdown                               *
*************************************************/
void deinitialize()
   {
   set_global_state(0);
   }

}

}