#pragma once

/*!
 * \file
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <stdbool.h>

#include "keypair.h"
#include "sharedkey.h"

/*! 
 * \brief Defines how a KeyPair create function should look like.
 *        Used to store a pointer to function to a implementation.
 */
typedef struct KeyPair (*KeyPairCreator)();

/*!
 * \brief Defines how a KeyPair deleter function should look like.
 *        Used to store a pointer to function to a implementation.
 */
typedef void (*KeyPairDeleter)(struct KeyPair);

/*!
 * \brief Defines how a Derived Shared Key function should look like.
 *        Used to store a pointer to function to a implementation.
 */
typedef struct SharedKey (*SharedKeyDeriver)(struct KeyPair, unsigned char const*, bool);

/*!
 * \brief Defines how a Derived Shared Key deleter function should look like.
 *        Used to store a pointer to function to a implementation.
 */
typedef void (*SharedKeyDeleter)(struct SharedKey);

/*!
 * \brief The Api struct stores pointers to functions of a specific implementation. Like a Curve25519 specific one.
 */
struct Api {
	KeyPairCreator create_key_pair; ///< Pointer to keypair creation function
	KeyPairDeleter free_key_pair; ///< Pointer to keypair deletor function
	SharedKeyDeriver derive_shared_key; ///< Pointer to shared key derivation function
	SharedKeyDeleter free_shared_key; ///< Pointer to shared key deleter function
};

/*!
 * A Pointer to function typedef to facilitate multiple implementations.
 */
typedef struct Api(*ImplementationGetter)();

/*!
 * \brief get_implementation The pointer to member function variable to implement when
 * defining a an implementation
 */
extern ImplementationGetter get_implementation;

#ifdef __cplusplus
}
#endif