/*

* X.509 Public Key

* (C) 1999-2010 Jack Lloyd

*

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

*/

#include <botan/x509_key.h>

#include <botan/data_src.h>

#include <botan/ber_dec.h>

#include <botan/pem.h>

#include <botan/asn1_obj.h>

#include <botan/pk_algs.h>

namespace Botan {

namespace X509 {

/*

* PEM encode a X.509 public key

*/

std::string PEM_encode(const Public_Key& key)

   {

   return PEM_Code::encode(key.subject_public_key(),

                           "PUBLIC KEY");

   }

/*

* Extract a public key and return it

*/

Public_Key* load_key(DataSource& source)

   {

   try {

      AlgorithmIdentifier alg_id;

      std::vector<uint8_t> key_bits;

      if(ASN1::maybe_BER(source) && !PEM_Code::matches(source))

         {

         BER_Decoder(source)

            .start_sequence()

            .decode(alg_id)

            .decode(key_bits, ASN1_Type::BitString)

         .end_cons();

         }

      else

         {

         DataSource_Memory ber(

            PEM_Code::decode_check_label(source, "PUBLIC KEY")

            );

         BER_Decoder(ber)

            .start_sequence()

            .decode(alg_id)

            .decode(key_bits, ASN1_Type::BitString)

         .end_cons();

         }

      if(key_bits.empty())

         throw Decoding_Error("X.509 public key decoding");

      return load_public_key(alg_id, key_bits).release();

      }

   catch(Decoding_Error& e)

      {

      throw Decoding_Error("X.509 public key decoding", e);

      }

   }

}

}