alg_id.cpp

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/*
* Algorithm Identifier
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#include <botan/asn1_obj.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/oids.h>
 
namespace Botan {
 
/*
* Create an AlgorithmIdentifier
*/
AlgorithmIdentifier::AlgorithmIdentifier(const OID& oid,
                                         const std::vector<uint8_t>& param) :
   m_oid(oid),
   m_parameters(param)
   {}
 
/*
* Create an AlgorithmIdentifier
*/
AlgorithmIdentifier::AlgorithmIdentifier(const std::string& oid,
                                         const std::vector<uint8_t>& param) :
   AlgorithmIdentifier(OID::from_string(oid), param)
   {}
 
/*
* Create an AlgorithmIdentifier
*/
AlgorithmIdentifier::AlgorithmIdentifier(const OID& oid,
                                         Encoding_Option option) :
   m_oid(oid),
   m_parameters()
   {
   const uint8_t DER_NULL[] = { 0x05, 0x00 };
 
   if(option == USE_NULL_PARAM)
      m_parameters.assign(DER_NULL, DER_NULL + 2);
   }
 
/*
* Create an AlgorithmIdentifier
*/
AlgorithmIdentifier::AlgorithmIdentifier(const std::string& oid,
                                         Encoding_Option option) :
   m_oid(OID::from_string(oid)),
   m_parameters()
   {
   const uint8_t DER_NULL[] = { 0x05, 0x00 };
 
   if(option == USE_NULL_PARAM)
      m_parameters.assign(DER_NULL, DER_NULL + 2);
   }
 
bool AlgorithmIdentifier::parameters_are_null() const
   {
   return (m_parameters.size() == 2 && (m_parameters[0] == 0x05) && (m_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.parameters() == a2.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_sequence()
      .encode(oid())
      .raw_bytes(parameters())
   .end_cons();
   }
 
/*
* Decode a BER encoded AlgorithmIdentifier
*/
void AlgorithmIdentifier::decode_from(BER_Decoder& codec)
   {
   codec.start_sequence()
      .decode(m_oid)
      .raw_bytes(m_parameters)
   .end_cons();
   }
 
}