/*

* Algorithm Identifier

* (C) 1999-2007 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include <botan/alg_id.h>

#include <botan/der_enc.h>

#include <botan/ber_dec.h>

#include <botan/oids.h>

namespace Botan {

/*

* Create an AlgorithmIdentifier

*/

AlgorithmIdentifier::AlgorithmIdentifier(const OID& alg_id,

                                         const std::vector<uint8_t>& param) :

   oid(alg_id),

   parameters(param)

   {}

/*

* Create an AlgorithmIdentifier

*/

AlgorithmIdentifier::AlgorithmIdentifier(const std::string& alg_id,

                                         const std::vector<uint8_t>& param) :

   AlgorithmIdentifier(OID::from_string(alg_id), param)

   {}

/*

* Create an AlgorithmIdentifier

*/

AlgorithmIdentifier::AlgorithmIdentifier(const OID& alg_id,

                                         Encoding_Option option) :

   oid(alg_id),

   parameters()

   {

   const uint8_t DER_NULL[] = { 0x05, 0x00 };

   if(option == USE_NULL_PARAM)

      parameters.assign(DER_NULL, DER_NULL + 2);

   }

/*

* Create an AlgorithmIdentifier

*/

AlgorithmIdentifier::AlgorithmIdentifier(const std::string& alg_id,

                                         Encoding_Option option) :

   oid(OID::from_string(alg_id)),

   parameters()

   {

   const uint8_t DER_NULL[] = { 0x05, 0x00 };

   if(option == USE_NULL_PARAM)

      parameters.assign(DER_NULL, DER_NULL + 2);

   }

bool AlgorithmIdentifier::parameters_are_null() const

   {

   return (parameters.size() == 2 && (parameters[0] == 0x05) && (parameters[1] == 0x00));

   }

bool operator==(const AlgorithmIdentifier& a1, const AlgorithmIdentifier& a2)

   {

   if(a1.get_oid() != a2.get_oid())

      return false;

   /*

   * Treat NULL and empty as equivalent

   */

   if(a1.parameters_are_null_or_empty() &&

      a2.parameters_are_null_or_empty())

      {

      return true;

      }

   return (a1.get_parameters() == a2.get_parameters());

   }

bool operator!=(const AlgorithmIdentifier& a1, const AlgorithmIdentifier& a2)

   {

   return !(a1 == a2);

   }

/*

* DER encode an AlgorithmIdentifier

*/

void AlgorithmIdentifier::encode_into(DER_Encoder& codec) const

   {

   codec.start_cons(SEQUENCE)

      .encode(get_oid())

      .raw_bytes(get_parameters())

   .end_cons();

   }

/*

* Decode a BER encoded AlgorithmIdentifier

*/

void AlgorithmIdentifier::decode_from(BER_Decoder& codec)

   {

   codec.start_cons(SEQUENCE)

      .decode(oid)

      .raw_bytes(parameters)

   .end_cons();

   }

}