/**
 * @file tls_ffdhe.h
 * @brief FFDHE key exchange
 *
 * @section License
 *
 * Copyright (C) 2021-2026 Oryx Embedded SARL. All rights reserved.
 *
 * This file is part of CycloneSSL Eval
 * 
 * This software is provided in source form for a short-term evaluation only. The
 * evaluation license expires 90 days after the date you first download the software.
 *
 * If you plan to use this software in a commercial product, you are required to
 * purchase a commercial license from Oryx Embedded SARL.
 *
 * After the 90-day evaluation period, you agree to either purchase a commercial
 * license or delete all copies of this software. If you wish to extend the
 * evaluation period, you must contact sales@oryx-embedded.com.
 *
 * This evaluation software is provided "as is" without warranty of any kind.
 * Technical support is available as an option during the evaluation period.

 *
 * @author Oryx Embedded SARL (www.oryx-embedded.com)
 * @version 2.6.0
 **/

#ifndef _TLS_FFDHE_H
#define _TLS_FFDHE_H

//Dependencies
#include "tls.h"
#include "pkc/dh.h"

//Maximum size of FFDHE prime modulus
#if (TLS_FFDHE4096_SUPPORT == ENABLED)
   #define TLS_MAX_FFDHE_MODULUS_SIZE 512
#elif (TLS_FFDHE3072_SUPPORT == ENABLED)
   #define TLS_MAX_FFDHE_MODULUS_SIZE 384
#else
   #define TLS_MAX_FFDHE_MODULUS_SIZE 256
#endif

//C++ guard
#ifdef __cplusplus
extern "C" {
#endif


/**
 * @brief FFDHE parameters
 **/

typedef struct
{
   const char_t *name;                          ///<Group name
   const uint8_t p[TLS_MAX_FFDHE_MODULUS_SIZE]; ///<Prime modulus
   size_t pLen;                                 ///<Length of the prime modulus, in bytes
   uint8_t g;                                   ///<Generator
} TlsFfdheGroup;


//TLS related functions
error_t tlsSelectFfdheGroup(TlsContext *context,
   const TlsSupportedGroupList *groupList);

const TlsFfdheGroup *tlsGetFfdheGroup(TlsContext *context,
   uint16_t namedGroup);

error_t tlsLoadFfdheParameters(DhParameters *params,
   const TlsFfdheGroup *ffdheGroup);

//C++ guard
#ifdef __cplusplus
}
#endif

#endif
