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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_send_server_key_exchange PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function generates a ServerKeyExchange message, which is used */
/* when the chosen ciphersuite requires additional information for key */
/* generation, such as when using Diffie-Hellman ciphers. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* send_packet Packet used to send message */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* [nx_secure_generate_server_key_exchange] */
/* Generate ServerKeyExchange */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_server_handshake DTLS server state machine */
/* _nx_secure_tls_server_handshake TLS server state machine */
/* */
/**************************************************************************/
UINT _nx_secure_tls_send_server_key_exchange(NX_SECURE_TLS_SESSION *tls_session,
NX_PACKET *send_packet)
{
#ifndef NX_SECURE_TLS_SERVER_DISABLED
ULONG length;
const NX_SECURE_TLS_CIPHERSUITE_INFO *ciphersuite;
UINT status;
VOID *tls_ecc_curves = NX_NULL;
UCHAR tls_1_3 = 0;
/* Build up the server key exchange message. Structure:
* | 2 | <key data length> |
* | Key data length | Key data (opaque) |
*/
/* Figure out which ciphersuite we are using. */
ciphersuite = tls_session -> nx_secure_tls_session_ciphersuite;
if (ciphersuite == NX_NULL)
{
/* Likely internal error since at this point ciphersuite negotiation was theoretically completed. */
return(NX_SECURE_TLS_UNKNOWN_CIPHERSUITE);
}
length = 0;
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
tls_ecc_curves = &tls_session -> nx_secure_tls_ecc;
#endif
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
tls_1_3 = tls_session -> nx_secure_tls_1_3;
#endif
status = tls_session -> nx_secure_generate_server_key_exchange(ciphersuite, tls_session -> nx_secure_tls_protocol_version, tls_1_3,
tls_session -> nx_secure_tls_crypto_table, &tls_session -> nx_secure_tls_handshake_hash,
&tls_session -> nx_secure_tls_key_material, &tls_session -> nx_secure_tls_credentials,
send_packet -> nx_packet_append_ptr,
(ULONG)(send_packet -> nx_packet_data_end) - (ULONG)(send_packet -> nx_packet_append_ptr),
&length, 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_ecc_curves);
if (status)
{
return(status);
}
/* Finally, we have a complete length and can adjust our packet accordingly. */
send_packet -> nx_packet_append_ptr = send_packet -> nx_packet_append_ptr + length;
send_packet -> nx_packet_length = send_packet -> nx_packet_length + length;
return(NX_SECURE_TLS_SUCCESS);
#else
NX_PARAMETER_NOT_USED(tls_session);
NX_PARAMETER_NOT_USED(send_packet);
return(NX_SECURE_TLS_INVALID_STATE);
#endif
}
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