/*
* KDF Retrieval
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/kdf.h>
#include <botan/libstate.h>
#include <botan/scan_name.h>

#if defined(BOTAN_HAS_KDF1)
  #include <botan/kdf1.h>
#endif

#if defined(BOTAN_HAS_KDF2)
  #include <botan/kdf2.h>
#endif

#if defined(BOTAN_HAS_X942_PRF)
  #include <botan/prf_x942.h>
#endif

#if defined(BOTAN_HAS_TLS_V10_PRF)
  #include <botan/prf_tls.h>
#endif

namespace Botan {

KDF* get_kdf(const std::string& algo_spec)
   {
   SCAN_Name request(algo_spec);

   Algorithm_Factory& af = global_state().algorithm_factory();

   if(request.algo_name() == "Raw")
      return nullptr; // No KDF

#if defined(BOTAN_HAS_KDF1)
   if(request.algo_name() == "KDF1" && request.arg_count() == 1)
      return new KDF1(af.make_hash_function(request.arg(0)));
#endif

#if defined(BOTAN_HAS_KDF2)
   if(request.algo_name() == "KDF2" && request.arg_count() == 1)
      return new KDF2(af.make_hash_function(request.arg(0)));
#endif

#if defined(BOTAN_HAS_X942_PRF)
   if(request.algo_name() == "X9.42-PRF" && request.arg_count() == 1)
      return new X942_PRF(request.arg(0)); // OID
#endif

#if defined(BOTAN_HAS_TLS_V10_PRF)
   if(request.algo_name() == "TLS-PRF" && request.arg_count() == 0)
      return new TLS_PRF;
#endif

#if defined(BOTAN_HAS_TLS_V10_PRF)
   if(request.algo_name() == "TLS-PRF" && request.arg_count() == 0)
      return new TLS_PRF;
#endif

#if defined(BOTAN_HAS_TLS_V12_PRF)
   if(request.algo_name() == "TLS-12-PRF" && request.arg_count() == 1)
      return new TLS_12_PRF(af.make_mac("HMAC(" + request.arg(0) + ")"));
#endif

   throw Algorithm_Not_Found(algo_spec);
   }

}