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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 */
/** */
/** Transport Layer Security (TLS) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_tls.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_process_client_key_exchange PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes an incoming ClientKeyExchange message, */
/* which contains the encrypted Pre-Master Secret. This function */
/* decrypts the Pre-Master Secret and saves it in the TLS session */
/* control block for use in generating session key material later. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* packet_buffer Pointer to message data */
/* message_length Length of message data (bytes)*/
/* id TLS or DTLS */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* [nx_secure_process_client_key_exchange] */
/* Process ClientKeyExchange */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_server_handshake DTLS server state machine */
/* _nx_secure_tls_server_handshake TLS server state machine */
/* */
/**************************************************************************/
UINT _nx_secure_tls_process_client_key_exchange(NX_SECURE_TLS_SESSION *tls_session,
UCHAR *packet_buffer, UINT message_length, UINT id)
{
#ifndef NX_SECURE_TLS_SERVER_DISABLED
UINT status;
NX_PARAMETER_NOT_USED(id);
if (tls_session -> nx_secure_tls_session_ciphersuite == NX_NULL)
{
/* Likely internal error since at this point ciphersuite negotiation was theoretically completed. */
return(NX_SECURE_TLS_UNKNOWN_CIPHERSUITE);
}
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
/* Process key material. The contents of the handshake record differ according to the
ciphersuite chosen in the Client/Server Hello negotiation. */
status = tls_session -> nx_secure_process_client_key_exchange(tls_session -> nx_secure_tls_session_ciphersuite, tls_session -> nx_secure_tls_protocol_version,
packet_buffer, message_length, &tls_session -> nx_secure_tls_received_remote_credentials, &tls_session -> nx_secure_tls_key_material,
&tls_session -> nx_secure_tls_credentials, tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
&tls_session -> nx_secure_tls_ecc);
#else
/* Process key material. The contents of the handshake record differ according to the
ciphersuite chosen in the Client/Server Hello negotiation. */
status = tls_session -> nx_secure_process_client_key_exchange(tls_session -> nx_secure_tls_session_ciphersuite, tls_session -> nx_secure_tls_protocol_version,
packet_buffer, message_length, &tls_session -> nx_secure_tls_received_remote_credentials, &tls_session -> nx_secure_tls_key_material,
&tls_session -> nx_secure_tls_credentials, tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL);
#endif
return(status);
#else
NX_PARAMETER_NOT_USED(packet_buffer);
NX_PARAMETER_NOT_USED(message_length);
NX_PARAMETER_NOT_USED(id);
/* If TLS Server is disabled and we have processed a ClientKeyExchange, something is wrong... */
tls_session -> nx_secure_tls_client_state = NX_SECURE_TLS_CLIENT_STATE_ERROR;
return(NX_SECURE_TLS_INVALID_STATE);
#endif
}
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