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/*
Algorithm Factory
(C) 2008 Jack Lloyd
*/
#include <botan/algo_factory.h>
#include <botan/stl_util.h>
#include <botan/engine.h>
#include <botan/exceptn.h>
#include <botan/block_cipher.h>
#include <botan/stream_cipher.h>
#include <botan/hash.h>
#include <botan/mac.h>
#include <algorithm>
namespace Botan {
namespace {
/**
* Template functions for the factory prototype/search algorithm
*/
template<typename T>
T* engine_get_algo(Engine* engine, const SCAN_Name& request,
Algorithm_Factory& af)
{ return 0; }
template<>
BlockCipher* engine_get_algo(Engine* engine, const SCAN_Name& request,
Algorithm_Factory& af)
{ return engine->find_block_cipher(request, af); }
template<>
StreamCipher* engine_get_algo(Engine* engine, const SCAN_Name& request,
Algorithm_Factory& af)
{ return engine->find_stream_cipher(request, af); }
template<>
HashFunction* engine_get_algo(Engine* engine, const SCAN_Name& request,
Algorithm_Factory& af)
{ return engine->find_hash(request, af); }
template<>
MessageAuthenticationCode* engine_get_algo(Engine* engine,
const SCAN_Name& request,
Algorithm_Factory& af)
{ return engine->find_mac(request, af); }
template<typename T>
const T* factory_prototype(const std::string& algo_spec,
const std::string& provider,
const std::vector<Engine*>& engines,
Algorithm_Factory& af,
Algorithm_Cache<T>& cache)
{
if(const T* cache_hit = cache.get(algo_spec, provider))
return cache_hit;
SCAN_Name scan_name(algo_spec);
for(u32bit i = 0; i != engines.size(); ++i)
{
T* impl = engine_get_algo<T>(engines[i], scan_name, af);
if(impl)
cache.add(impl, algo_spec, engines[i]->provider_name());
}
return cache.get(algo_spec, provider);
}
}
/**
* Setup caches
*/
Algorithm_Factory::Algorithm_Factory(const std::vector<Engine*>& engines_in,
Mutex_Factory& mf) :
engines(engines_in),
block_cipher_cache(mf.make()),
stream_cipher_cache(mf.make()),
hash_cache(mf.make()),
mac_cache(mf.make())
{
}
/**
* Delete all engines
*/
Algorithm_Factory::~Algorithm_Factory()
{
std::for_each(engines.begin(), engines.end(), del_fun<Engine>());
engines.clear();
}
/**
* Set the preferred provider for an algorithm
*/
void Algorithm_Factory::set_preferred_provider(const std::string& algo_spec,
const std::string& provider)
{
if(prototype_block_cipher(algo_spec))
block_cipher_cache.set_preferred_provider(algo_spec, provider);
else if(prototype_stream_cipher(algo_spec))
stream_cipher_cache.set_preferred_provider(algo_spec, provider);
else if(prototype_hash_function(algo_spec))
hash_cache.set_preferred_provider(algo_spec, provider);
else if(prototype_mac(algo_spec))
mac_cache.set_preferred_provider(algo_spec, provider);
}
/**
* 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 possible providers of a request
* Note: assumes you don't have different types by the same name
*/
std::vector<std::string>
Algorithm_Factory::providers_of(const std::string& algo_spec)
{
if(prototype_block_cipher(algo_spec))
return block_cipher_cache.providers_of(algo_spec);
else if(prototype_stream_cipher(algo_spec))
return stream_cipher_cache.providers_of(algo_spec);
else if(prototype_hash_function(algo_spec))
return hash_cache.providers_of(algo_spec);
else if(prototype_mac(algo_spec))
return mac_cache.providers_of(algo_spec);
else
return std::vector<std::string>();
}
/**
* Return the prototypical block cipher cooresponding to this request
*/
const BlockCipher*
Algorithm_Factory::prototype_block_cipher(const std::string& algo_spec,
const std::string& provider)
{
return factory_prototype<BlockCipher>(algo_spec, provider, engines,
*this, block_cipher_cache);
}
/**
* Return the prototypical stream cipher cooresponding to this request
*/
const StreamCipher*
Algorithm_Factory::prototype_stream_cipher(const std::string& algo_spec,
const std::string& provider)
{
return factory_prototype<StreamCipher>(algo_spec, provider, engines,
*this, stream_cipher_cache);
}
/**
* Return the prototypical object cooresponding to this request (if found)
*/
const HashFunction*
Algorithm_Factory::prototype_hash_function(const std::string& algo_spec,
const std::string& provider)
{
return factory_prototype<HashFunction>(algo_spec, provider, engines,
*this, hash_cache);
}
/**
* Return the prototypical object cooresponding to this request
*/
const MessageAuthenticationCode*
Algorithm_Factory::prototype_mac(const std::string& algo_spec,
const std::string& provider)
{
return factory_prototype<MessageAuthenticationCode>(algo_spec, provider, engines,
*this, mac_cache);
}
/**
* Return a new block cipher cooresponding to this request
*/
BlockCipher*
Algorithm_Factory::make_block_cipher(const std::string& algo_spec,
const std::string& provider)
{
if(const BlockCipher* proto = prototype_block_cipher(algo_spec, provider))
return proto->clone();
throw Algorithm_Not_Found(algo_spec);
}
/**
* Return a new stream cipher cooresponding to this request
*/
StreamCipher*
Algorithm_Factory::make_stream_cipher(const std::string& algo_spec,
const std::string& provider)
{
if(const StreamCipher* proto = prototype_stream_cipher(algo_spec, provider))
return proto->clone();
throw Algorithm_Not_Found(algo_spec);
}
/**
* Return a new object cooresponding to this request
*/
HashFunction*
Algorithm_Factory::make_hash_function(const std::string& algo_spec,
const std::string& provider)
{
if(const HashFunction* proto = prototype_hash_function(algo_spec, provider))
return proto->clone();
throw Algorithm_Not_Found(algo_spec);
}
/**
* Return a new object cooresponding to this request
*/
MessageAuthenticationCode*
Algorithm_Factory::make_mac(const std::string& algo_spec,
const std::string& provider)
{
if(const MessageAuthenticationCode* proto = prototype_mac(algo_spec, provider))
return proto->clone();
throw Algorithm_Not_Found(algo_spec);
}
/**
* Add a new block cipher
*/
void Algorithm_Factory::add_block_cipher(BlockCipher* block_cipher,
const std::string& provider)
{
block_cipher_cache.add(block_cipher, block_cipher->name(), provider);
}
/**
* Add a new stream cipher
*/
void Algorithm_Factory::add_stream_cipher(StreamCipher* stream_cipher,
const std::string& provider)
{
stream_cipher_cache.add(stream_cipher, stream_cipher->name(), provider);
}
/**
* Add a new hash
*/
void Algorithm_Factory::add_hash_function(HashFunction* hash,
const std::string& provider)
{
hash_cache.add(hash, hash->name(), provider);
}
/**
* Add a new mac
*/
void Algorithm_Factory::add_mac(MessageAuthenticationCode* mac,
const std::string& provider)
{
mac_cache.add(mac, mac->name(), provider);
}
}
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