/**************************************************************************/
/*                                                                        */
/*       Copyright (c) Microsoft Corporation. All rights reserved.        */
/*                                                                        */
/*       This software is licensed under the Microsoft Software License   */
/*       Terms for Microsoft Azure RTOS. Full text of the license can be  */
/*       found in the LICENSE file at https://aka.ms/AzureRTOS_EULA       */
/*       and in the root directory of this software.                      */
/*                                                                        */
/**************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** NetX Secure Component                                                 */
/**                                                                       */
/**    Transport Layer Security (TLS)                                     */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/

#define NX_SECURE_SOURCE_CODE

#include "nx_secure_tls.h"

#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _nx_secure_tls_send_encrypted_extensions            PORTABLE C      */
/*                                                           6.1          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Timothy Stapko, Microsoft Corporation                               */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function sends the encrypted extensions delivered after a      */
/*    ServerHello message in a TLS 1.3 encrypted handshake.               */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    tls_session                           TLS control block             */
/*    packet_buffer                         Pointer to message data       */
/*    message_length                        Length of message data (bytes)*/
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    status                                Completion status             */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _nx_secure_tls_ciphersuite_lookup     Lookup current ciphersuite    */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    _nx_secure_tls_server_handshake       Process extensions            */
/*                                                                        */
/*  RELEASE HISTORY                                                       */
/*                                                                        */
/*    DATE              NAME                      DESCRIPTION             */
/*                                                                        */
/*  05-19-2020     Timothy Stapko           Initial Version 6.0           */
/*  09-30-2020     Timothy Stapko           Modified comment(s), update   */
/*                                           ciphersuite lookup method.   */
/*                                           resulting in version 6.1     */
/*                                                                        */
/**************************************************************************/
UINT _nx_secure_tls_send_encrypted_extensions(NX_SECURE_TLS_SESSION *tls_session, NX_PACKET *send_packet)
{
UINT status;

    status = NX_SUCCESS;

    /* Populate encrypted extensions here. */
    NX_PARAMETER_NOT_USED(tls_session);

    /* Sending 0-length encrypted extensions - still requires the length field (16 bits). */
    if (((ULONG)(send_packet -> nx_packet_data_end) - (ULONG)(send_packet -> nx_packet_append_ptr)) < 2u)
    {
        
        /* Packet buffer too small. */
        return(NX_SECURE_TLS_PACKET_BUFFER_TOO_SMALL);
    }

    send_packet -> nx_packet_append_ptr[0] = 0x0;
    send_packet -> nx_packet_append_ptr[1] = 0x0;
    send_packet -> nx_packet_append_ptr = send_packet -> nx_packet_append_ptr + 2;
    send_packet -> nx_packet_length = 2;



    return(status);
}
#endif