/*
* DSA
* (C) 1999-2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#ifndef BOTAN_DSA_H__
#define BOTAN_DSA_H__

#include <botan/dl_algo.h>

namespace Botan {

/**
* DSA Public Key
*/
class BOTAN_DLL DSA_PublicKey : public virtual DL_Scheme_PublicKey
   {
   public:
      std::string algo_name() const override { return "DSA"; }

      DL_Group::Format group_format() const override { return DL_Group::ANSI_X9_57; }
      size_t message_parts() const override { return 2; }
      size_t message_part_size() const override { return group_q().bytes(); }
      size_t max_input_bits() const override { return group_q().bits(); }

      DSA_PublicKey(const AlgorithmIdentifier& alg_id,
                    const secure_vector<byte>& key_bits) :
         DL_Scheme_PublicKey(alg_id, key_bits, DL_Group::ANSI_X9_57)
         {
         }

      DSA_PublicKey(const DL_Group& group, const BigInt& y);

      std::unique_ptr<PK_Ops::Verification>
         create_verification_op(RandomNumberGenerator& rng,
                                const std::string& params,
                                const std::string& provider) const override;
   protected:
      DSA_PublicKey() {}
   };

/**
* DSA Private Key
*/
class BOTAN_DLL DSA_PrivateKey : public DSA_PublicKey,
                                 public virtual DL_Scheme_PrivateKey
   {
   public:
      DSA_PrivateKey(const AlgorithmIdentifier& alg_id,
                     const secure_vector<byte>& key_bits,
                     RandomNumberGenerator& rng);

      DSA_PrivateKey(RandomNumberGenerator& rng,
                     const DL_Group& group,
                     const BigInt& private_key = 0);

      bool check_key(RandomNumberGenerator& rng, bool strong) const override;

      std::unique_ptr<PK_Ops::Signature>
         create_signature_op(RandomNumberGenerator& rng,
                             const std::string& params,
                             const std::string& provider) const;
   };

}

#endif