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/*************************************************
* EMSA/EME/KDF/MGF Retrieval Source File *
* (C) 1999-2008 The Botan Project *
*************************************************/
#include <botan/lookup.h>
#include <botan/parsing.h>
#include <botan/emsa.h>
#include <botan/eme.h>
#include <botan/kdf.h>
#include <botan/mgf1.h>
#include <botan/util.h>
namespace Botan {
/*************************************************
* Get an EMSA by name *
*************************************************/
EMSA* get_emsa(const std::string& algo_spec)
{
std::vector<std::string> name = parse_algorithm_name(algo_spec);
const std::string emsa_name = deref_alias(name[0]);
if(emsa_name == "Raw")
{
if(name.size() == 1)
return new EMSA_Raw;
}
else if(emsa_name == "EMSA1")
{
if(name.size() == 2)
return new EMSA1(name[1]);
}
else if(emsa_name == "EMSA2")
{
if(name.size() == 2)
return new EMSA2(name[1]);
}
else if(emsa_name == "EMSA3")
{
if(name.size() == 2)
return new EMSA3(name[1]);
}
else if(emsa_name == "EMSA4")
{
if(name.size() == 2)
return new EMSA4(name[1], "MGF1");
if(name.size() == 3)
return new EMSA4(name[1], name[2]);
if(name.size() == 4)
return new EMSA4(name[1], name[2], to_u32bit(name[3]));
}
else
throw Algorithm_Not_Found(algo_spec);
throw Invalid_Algorithm_Name(algo_spec);
}
/*************************************************
* Get an EME by name *
*************************************************/
EME* get_eme(const std::string& algo_spec)
{
std::vector<std::string> name = parse_algorithm_name(algo_spec);
const std::string eme_name = deref_alias(name[0]);
if(eme_name == "PKCS1v15")
{
if(name.size() == 1)
return new EME_PKCS1v15;
}
else if(eme_name == "EME1")
{
if(name.size() == 2)
return new EME1(name[1], "MGF1");
if(name.size() == 3)
return new EME1(name[1], name[2]);
}
else
throw Algorithm_Not_Found(algo_spec);
throw Invalid_Algorithm_Name(algo_spec);
}
/*************************************************
* Get an KDF by name *
*************************************************/
KDF* get_kdf(const std::string& algo_spec)
{
std::vector<std::string> name = parse_algorithm_name(algo_spec);
const std::string kdf_name = deref_alias(name[0]);
if(kdf_name == "KDF1")
{
if(name.size() == 2)
return new KDF1(name[1]);
}
else if(kdf_name == "KDF2")
{
if(name.size() == 2)
return new KDF2(name[1]);
}
else if(kdf_name == "X9.42-PRF")
{
if(name.size() == 2)
return new X942_PRF(name[1]);
}
else
throw Algorithm_Not_Found(algo_spec);
throw Invalid_Algorithm_Name(algo_spec);
}
/*************************************************
* Get a MGF by name *
*************************************************/
MGF* get_mgf(const std::string& algo_spec)
{
std::vector<std::string> name = parse_algorithm_name(algo_spec);
const std::string mgf_name = deref_alias(name[0]);
if(mgf_name == "MGF1")
{
if(name.size() == 2)
return new MGF1(name[1]);
}
else
throw Algorithm_Not_Found(algo_spec);
throw Invalid_Algorithm_Name(algo_spec);
}
}
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