/*

* Elliptic curves over GF(p)

*

* (C) 2007 Martin Doering, Christoph Ludwig, Falko Strenzke

*     2010-2011,2012,2014,2024 Jack Lloyd

*

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

*/

#ifndef BOTAN_GFP_CURVE_H_

#define BOTAN_GFP_CURVE_H_

#include <botan/bigint.h>

// Currently exposed in EC_Point

//BOTAN_FUTURE_INTERNAL_HEADER(curve_gfp.h)

namespace Botan {

class EC_Group_Data;

/**

* This is an internal type which is only exposed for accidental

* historical reasons. Do not use it in any way.

*

* This class will be removed in Botan4.

*/

class BOTAN_UNSTABLE_API CurveGFp final {

   public:

      /**

      * @return curve coefficient a

      */

      const BigInt& get_a() const;

      /**

      * @return curve coefficient b

      */

      const BigInt& get_b() const;

      /**

      * Get prime modulus of the field of the curve

      * @return prime modulus of the field of the curve

      */

      const BigInt& get_p() const;

      size_t get_p_words() const;

      CurveGFp(const CurveGFp&) = default;

   private:

      friend class EC_Point;

      friend class EC_Group_Data;

      /**

      * Create an uninitialized CurveGFp

      */

      CurveGFp() = default;

      CurveGFp(const EC_Group_Data* group);

      CurveGFp& operator=(const CurveGFp&) = default;

      void swap(CurveGFp& other) { std::swap(m_group, other.m_group); }

      bool operator==(const CurveGFp& other) const { return (m_group == other.m_group); }

   private:

      const EC_Group_Data& group() const {

         BOTAN_ASSERT_NONNULL(m_group);

         return *m_group;

      }

      /**

      * Raw pointer

      *

      * This EC_Group_Data is not owned because instead the EC_Group_Data

      * owns this CurveGFp, so we can always access it safely. If it was

      * a shared_ptr this would cause a reference cycle.

      */

      const EC_Group_Data* m_group = nullptr;

};

}  // namespace Botan

#endif