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/**
* Engine Base Class
* (C) 1999-2007 Jack Lloyd
*/
#include <botan/engine.h>
#include <botan/stl_util.h>
#include <botan/mode_pad.h>
namespace Botan {
namespace {
/*************************************************
* Algorithm Cache *
*************************************************/
template<typename T>
class Algorithm_Cache_Impl : public Engine::Algorithm_Cache<T>
{
public:
T* get(const std::string& name) const
{
Mutex_Holder lock(mutex);
return search_map(mappings, name);
}
void add(T* algo, const std::string& index_name = "") const
{
if(!algo)
return;
Mutex_Holder lock(mutex);
const std::string name =
(index_name != "" ? index_name : algo->name());
if(mappings.find(name) != mappings.end())
delete mappings[name];
mappings[name] = algo;
}
Algorithm_Cache_Impl(Mutex* m) : mutex(m) {}
~Algorithm_Cache_Impl()
{
typename std::map<std::string, T*>::iterator i = mappings.begin();
while(i != mappings.end())
{
delete i->second;
++i;
}
delete mutex;
}
private:
Mutex* mutex;
mutable std::map<std::string, T*> mappings;
};
}
/*************************************************
* Acquire a BlockCipher *
*************************************************/
const BlockCipher*
Engine::prototype_block_cipher(const SCAN_Name& request,
Algorithm_Factory& af) const
{
// This needs to respect provider settings
BlockCipher* algo = cache_of_bc->get(request.as_string());
if(algo)
return algo;
// cache miss: do full search
algo = find_block_cipher(request, af);
if(algo)
cache_of_bc->add(algo, request.as_string());
return algo;
}
/*************************************************
* Acquire a StreamCipher *
*************************************************/
const StreamCipher*
Engine::prototype_stream_cipher(const SCAN_Name& request,
Algorithm_Factory& af) const
{
// This needs to respect provider settings
StreamCipher* algo = cache_of_sc->get(request.as_string());
if(algo)
return algo;
// cache miss: do full search
algo = find_stream_cipher(request, af);
if(algo)
cache_of_sc->add(algo, request.as_string());
return algo;
}
/*************************************************
* Acquire a HashFunction *
*************************************************/
const HashFunction*
Engine::prototype_hash_function(const SCAN_Name& request,
Algorithm_Factory& af) const
{
// This needs to respect provider settings
HashFunction* algo = cache_of_hf->get(request.as_string());
if(algo)
return algo;
// cache miss: do full search
algo = find_hash(request, af);
if(algo)
cache_of_hf->add(algo, request.as_string());
return algo;
}
/*************************************************
* Acquire a MessageAuthenticationCode *
*************************************************/
const MessageAuthenticationCode*
Engine::prototype_mac(const SCAN_Name& request,
Algorithm_Factory& af) const
{
// This needs to respect provider settings
MessageAuthenticationCode* algo = cache_of_mac->get(request.as_string());
if(algo)
return algo;
// cache miss: do full search
algo = find_mac(request, af);
if(algo)
cache_of_mac->add(algo, request.as_string());
return algo;
}
/*************************************************
* Add a block cipher to the lookup table *
*************************************************/
void Engine::add_algorithm(BlockCipher* algo) const
{
cache_of_bc->add(algo);
}
/*************************************************
* Add a stream cipher to the lookup table *
*************************************************/
void Engine::add_algorithm(StreamCipher* algo) const
{
cache_of_sc->add(algo);
}
/*************************************************
* Add a hash function to the lookup table *
*************************************************/
void Engine::add_algorithm(HashFunction* algo) const
{
cache_of_hf->add(algo);
}
/*************************************************
* Add a MAC to the lookup table *
*************************************************/
void Engine::add_algorithm(MessageAuthenticationCode* algo) const
{
cache_of_mac->add(algo);
}
void Engine::initialize(Mutex_Factory& mf)
{
cache_of_bc = new Algorithm_Cache_Impl<BlockCipher>(mf.make());
cache_of_sc = new Algorithm_Cache_Impl<StreamCipher>(mf.make());
cache_of_hf = new Algorithm_Cache_Impl<HashFunction>(mf.make());
cache_of_mac =
new Algorithm_Cache_Impl<MessageAuthenticationCode>(mf.make());
}
Engine::Engine()
{
cache_of_bc = 0;
cache_of_sc = 0;
cache_of_hf = 0;
cache_of_mac = 0;
}
/*************************************************
* Destroy an Engine *
*************************************************/
Engine::~Engine()
{
delete cache_of_bc;
delete cache_of_sc;
delete cache_of_hf;
delete cache_of_mac;
}
}
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