/*
* ECDSA Signature
* (C) 2007 Falko Strenzke, FlexSecure GmbH
* (C) 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/

#ifndef BOTAN_ECDSA_SIGNATURE_H__
#define BOTAN_ECDSA_SIGNATURE_H__

#include <botan/bigint.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>

namespace Botan {

/**
* Class representing an ECDSA signature
*/
class BOTAN_DLL ECDSA_Signature
   {
   public:
      friend class ECDSA_Signature_Decoder;

      ECDSA_Signature() {}
      ECDSA_Signature(const BigInt& r, const BigInt& s) :
         m_r(r), m_s(s) {}

      ECDSA_Signature(const MemoryRegion<byte>& ber);

      const BigInt& get_r() const { return m_r; }
      const BigInt& get_s() const { return m_s; }

      /**
      * return the r||s
      */
      MemoryVector<byte> get_concatenation() const;

      MemoryVector<byte> DER_encode() const;

      bool operator==(const ECDSA_Signature& other) const
         {
         return (get_r() == other.get_r() && get_s() == other.get_s());
         }

   private:
      BigInt m_r;
      BigInt m_s;
   };

inline bool operator!=(const ECDSA_Signature& lhs, const ECDSA_Signature& rhs)
   {
   return !(lhs == rhs);
   }

ECDSA_Signature decode_concatenation(const MemoryRegion<byte>& concatenation);

}

#endif
