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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2025-present Eclipse ThreadX Contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Secure Component */
/** */
/** Datagram Transport Layer Security (DTLS) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_dtls.h"
#ifdef NX_SECURE_ENABLE_DTLS
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_dtls_process_handshake_header PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes a DTLS Handshake record header, which is */
/* at the beginning of each DTLS Handshake message, encapsulated */
/* within the DTLS record itself. */
/* */
/* INPUT */
/* */
/* packet_buffer Pointer to incoming packet */
/* message_type Return message type value */
/* header_size Input size of packet buffer */
/* Return size of header */
/* message_length Return length of message */
/* message_seq Return sequence of message */
/* fragment_offset Return offset of fragment */
/* fragment_length Return length of fragment */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_client_handshake DTLS client state machine */
/* _nx_secure_dtls_server_handshake DTLS server state machine */
/* */
/**************************************************************************/
UINT _nx_secure_dtls_process_handshake_header(UCHAR *packet_buffer, USHORT *message_type,
UINT *header_size, UINT *message_length,
UINT *message_seq, UINT *fragment_offset,
UINT *fragment_length)
{
/* Check buffer length. */
if (*header_size < NX_SECURE_DTLS_HANDSHAKE_HEADER_SIZE)
{
return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH);
}
/* The message being passed in to this function should already be stripped of the TLS header
so the first byte in the packet/record is our handshake message type. */
*message_type = packet_buffer[0];
packet_buffer++;
/* Get the length of the TLS data. */
*message_length = (UINT)((packet_buffer[0] << 16) + (packet_buffer[1] << 8) + packet_buffer[2]);
packet_buffer += 3;
/* Extract message sequence number. */
*message_seq = (UINT)((packet_buffer[0] << 8) + packet_buffer[1]);
packet_buffer += 2;
/* Extract fragment offset. */
*fragment_offset = (UINT)((packet_buffer[0] << 16) + (packet_buffer[1] << 8) + packet_buffer[2]);
packet_buffer += 3;
/* Extract fragment length. */
*fragment_length = (UINT)((packet_buffer[0] << 16) + (packet_buffer[1] << 8) + packet_buffer[2]);
/* We have extracted the DTLS header. */
*header_size = NX_SECURE_DTLS_HANDSHAKE_HEADER_SIZE;
return(NX_SECURE_TLS_SUCCESS);
}
#endif /* NX_SECURE_ENABLE_DTLS */
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