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/*************************************************
* Algorithm Retrieval Source File *
* (C) 1999-2007 Jack Lloyd *
*************************************************/
#include <botan/lookup.h>
#include <botan/libstate.h>
#include <botan/engine.h>
namespace Botan {
/*************************************************
* Get a block cipher by name *
*************************************************/
BlockCipher* get_block_cipher(const std::string& name)
{
const BlockCipher* cipher = retrieve_block_cipher(global_state(), name);
if(cipher)
return cipher->clone();
throw Algorithm_Not_Found(name);
}
/*************************************************
* Get a stream cipher by name *
*************************************************/
StreamCipher* get_stream_cipher(const std::string& name)
{
const StreamCipher* cipher = retrieve_stream_cipher(global_state(), name);
if(cipher)
return cipher->clone();
throw Algorithm_Not_Found(name);
}
/*************************************************
* Get a hash function by name *
*************************************************/
HashFunction* get_hash(const std::string& name)
{
const HashFunction* hash = retrieve_hash(global_state(), name);
if(hash)
return hash->clone();
throw Algorithm_Not_Found(name);
}
/*************************************************
* Get a MAC by name *
*************************************************/
MessageAuthenticationCode* get_mac(const std::string& name)
{
const MessageAuthenticationCode* mac = retrieve_mac(global_state(), name);
if(mac)
return mac->clone();
throw Algorithm_Not_Found(name);
}
/*************************************************
* Query if an algorithm exists *
*************************************************/
bool have_algorithm(const std::string& name)
{
if(retrieve_block_cipher(global_state(), name))
return true;
if(retrieve_stream_cipher(global_state(), name))
return true;
if(retrieve_hash(global_state(), name))
return true;
if(retrieve_mac(global_state(), name))
return true;
return false;
}
/*************************************************
* Query if Botan has the named block cipher *
*************************************************/
bool have_block_cipher(const std::string& name)
{
return (retrieve_block_cipher(global_state(), name) != 0);
}
/*************************************************
* Query if Botan has the named stream cipher *
*************************************************/
bool have_stream_cipher(const std::string& name)
{
return (retrieve_stream_cipher(global_state(), name) != 0);
}
/*************************************************
* Query if Botan has the named hash function *
*************************************************/
bool have_hash(const std::string& name)
{
return (retrieve_hash(global_state(), name) != 0);
}
/*************************************************
* Query if Botan has the named MAC *
*************************************************/
bool have_mac(const std::string& name)
{
return (retrieve_mac(global_state(), name) != 0);
}
/*************************************************
* Query the block size of a cipher or hash *
*************************************************/
u32bit block_size_of(const std::string& name)
{
const BlockCipher* cipher = retrieve_block_cipher(global_state(), name);
if(cipher)
return cipher->BLOCK_SIZE;
const HashFunction* hash = retrieve_hash(global_state(), name);
if(hash)
return hash->HASH_BLOCK_SIZE;
throw Algorithm_Not_Found(name);
}
/*************************************************
* Query the OUTPUT_LENGTH of a hash or MAC *
*************************************************/
u32bit output_length_of(const std::string& name)
{
const HashFunction* hash = retrieve_hash(global_state(), name);
if(hash)
return hash->OUTPUT_LENGTH;
const MessageAuthenticationCode* mac = retrieve_mac(global_state(), name);
if(mac)
return mac->OUTPUT_LENGTH;
throw Algorithm_Not_Found(name);
}
/*************************************************
* Check if a keylength is valid for this algo *
*************************************************/
bool valid_keylength_for(u32bit key_len, const std::string& name)
{
const BlockCipher* bc = retrieve_block_cipher(global_state(), name);
if(bc)
return bc->valid_keylength(key_len);
const StreamCipher* sc = retrieve_stream_cipher(global_state(), name);
if(sc)
return sc->valid_keylength(key_len);
const MessageAuthenticationCode* mac = retrieve_mac(global_state(), name);
if(mac)
return mac->valid_keylength(key_len);
throw Algorithm_Not_Found(name);
}
/*************************************************
* Query the MINIMUM_KEYLENGTH of an algorithm *
*************************************************/
u32bit min_keylength_of(const std::string& name)
{
const BlockCipher* bc = retrieve_block_cipher(global_state(), name);
if(bc)
return bc->MINIMUM_KEYLENGTH;
const StreamCipher* sc = retrieve_stream_cipher(global_state(), name);
if(sc)
return sc->MINIMUM_KEYLENGTH;
const MessageAuthenticationCode* mac = retrieve_mac(global_state(), name);
if(mac)
return mac->MINIMUM_KEYLENGTH;
throw Algorithm_Not_Found(name);
}
/*************************************************
* Query the MAXIMUM_KEYLENGTH of an algorithm *
*************************************************/
u32bit max_keylength_of(const std::string& name)
{
const BlockCipher* bc = retrieve_block_cipher(global_state(), name);
if(bc)
return bc->MAXIMUM_KEYLENGTH;
const StreamCipher* sc = retrieve_stream_cipher(global_state(), name);
if(sc)
return sc->MAXIMUM_KEYLENGTH;
const MessageAuthenticationCode* mac = retrieve_mac(global_state(), name);
if(mac)
return mac->MAXIMUM_KEYLENGTH;
throw Algorithm_Not_Found(name);
}
/*************************************************
* Query the KEYLENGTH_MULTIPLE of an algorithm *
*************************************************/
u32bit keylength_multiple_of(const std::string& name)
{
const BlockCipher* bc = retrieve_block_cipher(global_state(), name);
if(bc)
return bc->KEYLENGTH_MULTIPLE;
const StreamCipher* sc = retrieve_stream_cipher(global_state(), name);
if(sc)
return sc->KEYLENGTH_MULTIPLE;
const MessageAuthenticationCode* mac = retrieve_mac(global_state(), name);
if(mac)
return mac->KEYLENGTH_MULTIPLE;
throw Algorithm_Not_Found(name);
}
/*************************************************
* Acquire a block cipher *
*************************************************/
const BlockCipher* retrieve_block_cipher(Library_State& libstate,
const std::string& name)
{
Library_State::Engine_Iterator i(libstate);
while(const Engine* engine = i.next())
{
const BlockCipher* algo = engine->block_cipher(name);
if(algo)
return algo;
}
return 0;
}
/*************************************************
* Acquire a stream cipher *
*************************************************/
const StreamCipher* retrieve_stream_cipher(Library_State& libstate,
const std::string& name)
{
Library_State::Engine_Iterator i(libstate);
while(const Engine* engine = i.next())
{
const StreamCipher* algo = engine->stream_cipher(name);
if(algo)
return algo;
}
return 0;
}
/*************************************************
* Acquire a hash function *
*************************************************/
const HashFunction* retrieve_hash(Library_State& libstate,
const std::string& name)
{
Library_State::Engine_Iterator i(libstate);
while(const Engine* engine = i.next())
{
const HashFunction* algo = engine->hash(name);
if(algo)
return algo;
}
return 0;
}
/*************************************************
* Acquire an authentication code *
*************************************************/
const MessageAuthenticationCode* retrieve_mac(Library_State& libstate,
const std::string& name)
{
Library_State::Engine_Iterator i(libstate);
while(const Engine* engine = i.next())
{
const MessageAuthenticationCode* algo = engine->mac(name);
if(algo)
return algo;
}
return 0;
}
/*************************************************
* Add a new block cipher *
*************************************************/
void add_algorithm(Library_State& libstate, BlockCipher* algo)
{
Library_State::Engine_Iterator i(libstate);
while(Engine* engine = i.next())
{
if(engine->can_add_algorithms())
{
engine->add_algorithm(algo);
return;
}
}
throw Invalid_State("add_algorithm: Couldn't find the Default_Engine");
}
/*************************************************
* Add a new stream cipher *
*************************************************/
void add_algorithm(Library_State& libstate, StreamCipher* algo)
{
Library_State::Engine_Iterator i(libstate);
while(Engine* engine = i.next())
{
if(engine->can_add_algorithms())
{
engine->add_algorithm(algo);
return;
}
}
throw Invalid_State("add_algorithm: Couldn't find the Default_Engine");
}
/*************************************************
* Add a new hash function *
*************************************************/
void add_algorithm(Library_State& libstate, HashFunction* algo)
{
Library_State::Engine_Iterator i(libstate);
while(Engine* engine = i.next())
{
if(engine->can_add_algorithms())
{
engine->add_algorithm(algo);
return;
}
}
throw Invalid_State("add_algorithm: Couldn't find the Default_Engine");
}
/*************************************************
* Add a new authentication code *
*************************************************/
void add_algorithm(Library_State& libstate,
MessageAuthenticationCode* algo)
{
Library_State::Engine_Iterator i(libstate);
while(Engine* engine = i.next())
{
if(engine->can_add_algorithms())
{
engine->add_algorithm(algo);
return;
}
}
throw Invalid_State("add_algorithm: Couldn't find the Default_Engine");
}
/*************************************************
* Get a cipher object *
*************************************************/
Keyed_Filter* get_cipher(const std::string& algo_spec,
Cipher_Dir direction)
{
Library_State::Engine_Iterator i(global_state());
while(Engine* engine = i.next())
{
Keyed_Filter* algo = engine->get_cipher(algo_spec, direction);
if(algo)
return algo;
}
throw Algorithm_Not_Found(algo_spec);
}
/*************************************************
* Get a cipher object *
*************************************************/
Keyed_Filter* get_cipher(const std::string& algo_spec,
const SymmetricKey& key,
const InitializationVector& iv,
Cipher_Dir direction)
{
Keyed_Filter* cipher = get_cipher(algo_spec, direction);
cipher->set_key(key);
if(iv.length())
cipher->set_iv(iv);
return cipher;
}
/*************************************************
* Get a cipher object *
*************************************************/
Keyed_Filter* get_cipher(const std::string& algo_spec,
const SymmetricKey& key,
Cipher_Dir direction)
{
return get_cipher(algo_spec,
key, InitializationVector(), direction);
}
}
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