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/*
* EMSA/EME Retrieval
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/emsa.h>
#include <botan/eme.h>
#include <botan/libstate.h>
#include <botan/scan_name.h>
#if defined(BOTAN_HAS_EMSA1)
#include <botan/emsa1.h>
#endif
#if defined(BOTAN_HAS_EMSA1_BSI)
#include <botan/emsa1_bsi.h>
#endif
#if defined(BOTAN_HAS_EMSA_X931)
#include <botan/emsa_x931.h>
#endif
#if defined(BOTAN_HAS_EMSA_PKCS1)
#include <botan/emsa_pkcs1.h>
#endif
#if defined(BOTAN_HAS_EMSA_PSSR)
#include <botan/pssr.h>
#endif
#if defined(BOTAN_HAS_EMSA_RAW)
#include <botan/emsa_raw.h>
#endif
#if defined(BOTAN_HAS_EME_OAEP)
#include <botan/oaep.h>
#endif
#if defined(BOTAN_HAS_EME_PKCS1v15)
#include <botan/eme_pkcs.h>
#endif
namespace Botan {
/*
* Get an EMSA by name
*/
EMSA* get_emsa(const std::string& algo_spec)
{
SCAN_Name request(algo_spec);
Algorithm_Factory& af = global_state().algorithm_factory();
#if defined(BOTAN_HAS_EMSA_RAW)
if(request.algo_name() == "Raw" && request.arg_count() == 0)
return new EMSA_Raw;
#endif
#if defined(BOTAN_HAS_EMSA1)
if(request.algo_name() == "EMSA1" && request.arg_count() == 1)
{
if(request.arg(0) == "Raw")
return new EMSA_Raw;
return new EMSA1(af.make_hash_function(request.arg(0)));
}
#endif
#if defined(BOTAN_HAS_EMSA1_BSI)
if(request.algo_name() == "EMSA1_BSI" && request.arg_count() == 1)
return new EMSA1_BSI(af.make_hash_function(request.arg(0)));
#endif
#if defined(BOTAN_HAS_EMSA_X931)
if(request.algo_name() == "EMSA_X931" && request.arg_count() == 1)
return new EMSA_X931(af.make_hash_function(request.arg(0)));
#endif
#if defined(BOTAN_HAS_EMSA_PKCS1)
if(request.algo_name() == "EMSA_PKCS1" && request.arg_count() == 1)
{
if(request.arg(0) == "Raw")
return new EMSA_PKCS1v15_Raw;
return new EMSA_PKCS1v15(af.make_hash_function(request.arg(0)));
}
#endif
#if defined(BOTAN_HAS_EMSA_PSSR)
if(request.algo_name() == "PSSR" && request.arg_count_between(1, 3))
{
// 3 args: Hash, MGF, salt size (MGF is hardcoded MGF1 in Botan)
if(request.arg_count() == 1)
return new PSSR(af.make_hash_function(request.arg(0)));
if(request.arg_count() == 2 && request.arg(1) != "MGF1")
return new PSSR(af.make_hash_function(request.arg(0)));
if(request.arg_count() == 3)
return new PSSR(af.make_hash_function(request.arg(0)),
request.arg_as_integer(2, 0));
}
#endif
throw Algorithm_Not_Found(algo_spec);
}
/*
* Get an EME by name
*/
EME* get_eme(const std::string& algo_spec)
{
SCAN_Name request(algo_spec);
if(request.algo_name() == "Raw")
return nullptr; // No padding
#if defined(BOTAN_HAS_EME_PKCS1v15)
if(request.algo_name() == "PKCS1v15" && request.arg_count() == 0)
return new EME_PKCS1v15;
#endif
#if defined(BOTAN_HAS_EME_OAEP)
Algorithm_Factory& af = global_state().algorithm_factory();
if(request.algo_name() == "OAEP" && request.arg_count_between(1, 2))
{
if(request.arg_count() == 1 ||
(request.arg_count() == 2 && request.arg(1) == "MGF1"))
{
return new OAEP(af.make_hash_function(request.arg(0)));
}
}
#endif
throw Algorithm_Not_Found(algo_spec);
}
}
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