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/*************************************************
* Basic No-Op Engine Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/engine.h>
#include <botan/libstate.h>
#include <botan/stl_util.h>
#include <botan/lookup.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 = global_state().get_mutex();
}
~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::block_cipher(const std::string& name) const
{
return lookup_algo(cache_of_bc, global_state().deref_alias(name),
this, &Engine::find_block_cipher);
}
/*************************************************
* Acquire a StreamCipher *
*************************************************/
const StreamCipher* Engine::stream_cipher(const std::string& name) const
{
return lookup_algo(cache_of_sc, global_state().deref_alias(name),
this, &Engine::find_stream_cipher);
}
/*************************************************
* Acquire a HashFunction *
*************************************************/
const HashFunction* Engine::hash(const std::string& name) const
{
return lookup_algo(cache_of_hf, global_state().deref_alias(name),
this, &Engine::find_hash);
}
/*************************************************
* Acquire a MessageAuthenticationCode *
*************************************************/
const MessageAuthenticationCode* Engine::mac(const std::string& name) const
{
return lookup_algo(cache_of_mac, global_state().deref_alias(name),
this, &Engine::find_mac);
}
/*************************************************
* Acquire a S2K object *
*************************************************/
const S2K* Engine::s2k(const std::string& name) const
{
return lookup_algo(cache_of_s2k, global_state().deref_alias(name),
this, &Engine::find_s2k);
}
/*************************************************
* Acquire a cipher padding object *
*************************************************/
const BlockCipherModePaddingMethod*
Engine::bc_pad(const std::string& name) const
{
return lookup_algo(cache_of_bc_pad, global_state().deref_alias(name),
this, &Engine::find_bc_pad);
}
/*************************************************
* 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);
}
/*************************************************
* Add a S2K to the lookup table *
*************************************************/
void Engine::add_algorithm(S2K* algo) const
{
cache_of_s2k->add(algo);
}
/*************************************************
* Add a cipher pad method to the lookup table *
*************************************************/
void Engine::add_algorithm(BlockCipherModePaddingMethod* algo) const
{
cache_of_bc_pad->add(algo);
}
/*************************************************
* Create an Engine *
*************************************************/
Engine::Engine()
{
cache_of_bc = new Algorithm_Cache_Impl<BlockCipher>();
cache_of_sc = new Algorithm_Cache_Impl<StreamCipher>();
cache_of_hf = new Algorithm_Cache_Impl<HashFunction>();
cache_of_mac = new Algorithm_Cache_Impl<MessageAuthenticationCode>();
cache_of_s2k = new Algorithm_Cache_Impl<S2K>();
cache_of_bc_pad =
new Algorithm_Cache_Impl<BlockCipherModePaddingMethod>();
}
/*************************************************
* Destroy an Engine *
*************************************************/
Engine::~Engine()
{
delete cache_of_bc;
delete cache_of_sc;
delete cache_of_hf;
delete cache_of_mac;
delete cache_of_s2k;
delete cache_of_bc_pad;
}
/*************************************************
* Basic No-Op Engine Implementation *
*************************************************/
BlockCipher* Engine::find_block_cipher(const std::string&) const
{
return 0;
}
/*************************************************
* Basic No-Op Engine Implementation *
*************************************************/
StreamCipher* Engine::find_stream_cipher(const std::string&) const
{
return 0;
}
/*************************************************
* Basic No-Op Engine Implementation *
*************************************************/
HashFunction* Engine::find_hash(const std::string&) const
{
return 0;
}
/*************************************************
* Basic No-Op Engine Implementation *
*************************************************/
MessageAuthenticationCode* Engine::find_mac(const std::string&) const
{
return 0;
}
/*************************************************
* Basic No-Op Engine Implementation *
*************************************************/
S2K* Engine::find_s2k(const std::string&) const
{
return 0;
}
/*************************************************
* Basic No-Op Engine Implementation *
*************************************************/
BlockCipherModePaddingMethod* Engine::find_bc_pad(const std::string&) const
{
return 0;
}
/*************************************************
* Basic No-Op Engine Implementation *
*************************************************/
Keyed_Filter* Engine::get_cipher(const std::string&, Cipher_Dir)
{
return 0;
}
}
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