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/*
Algorithm Factory
(C) 2008 Jack Lloyd
*/
#include <botan/libstate.h>
#include <botan/stl_util.h>
#include <botan/engine.h>
#include <botan/exceptn.h>
#include <algorithm>
namespace Botan {
/**
* Delete all engines
*/
Algorithm_Factory::~Algorithm_Factory()
{
std::for_each(engines.begin(), engines.end(), del_fun<Engine>());
engines.clear();
}
/**
* Add a new engine to the list
*/
void Algorithm_Factory::add_engine(Engine* engine)
{
engines.push_back(engine);
}
/*************************************************
* Get an engine out of the list *
*************************************************/
Engine* Algorithm_Factory::get_engine_n(u32bit n) const
{
if(n >= engines.size())
return 0;
return engines[n];
}
/**
* Return the prototypical object cooresponding to this request
*/
const HashFunction*
Algorithm_Factory::prototype_hash_function(const SCAN_Name& request)
{
for(u32bit i = 0; i != engines.size(); ++i)
{
if(request.provider_allowed(engines[i]->provider_name()))
{
const HashFunction* algo =
engines[i]->prototype_hash_function(request, *this);
if(algo)
return algo;
}
}
return 0;
}
/**
* Return a new object cooresponding to this request
*/
HashFunction* Algorithm_Factory::make_hash_function(const SCAN_Name& request)
{
const HashFunction* prototype = prototype_hash_function(request);
if(prototype)
return prototype->clone();
throw Algorithm_Not_Found(request.as_string());
}
void Algorithm_Factory::add_hash_function(HashFunction* hash)
{
for(u32bit i = 0; i != engines.size(); ++i)
{
if(engines[i]->can_add_algorithms())
{
engines[i]->add_algorithm(hash);
return;
}
}
throw Exception("Algorithm_Factory::add_hash_function: No engine found");
}
}
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