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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_generate_premaster_secret PORTABLE C */
/* 6.4.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function generates the Pre-Master Secret for TLS Client */
/* instances. It is sent to the remote host and used as the seed for */
/* session key generation. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* id TLS or DTLS */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_tls_protocol_version_get Get current TLS version to use*/
/* [nx_secure_generate_premaster_secret] Generate pre-master secret */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_client_handshake DTLS client state machine */
/* _nx_secure_tls_client_handshake TLS client state machine */
/* _nx_secure_tls_process_client_key_exchange */
/* Process ClientKeyExchange */
/* */
/**************************************************************************/
UINT _nx_secure_tls_generate_premaster_secret(NX_SECURE_TLS_SESSION *tls_session, UINT id)
{
UINT status;
USHORT protocol_version;
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);
}
_nx_secure_tls_protocol_version_get(tls_session, &protocol_version, id);
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
status = tls_session -> nx_secure_generate_premaster_secret(tls_session -> nx_secure_tls_session_ciphersuite, protocol_version,
&tls_session -> nx_secure_tls_key_material, &tls_session -> nx_secure_tls_credentials,
tls_session -> nx_secure_tls_socket_type,
&tls_session -> nx_secure_tls_received_remote_credentials, tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size, &tls_session -> nx_secure_tls_ecc);
#else
status = tls_session -> nx_secure_generate_premaster_secret(tls_session -> nx_secure_tls_session_ciphersuite, protocol_version,
&tls_session -> nx_secure_tls_key_material, &tls_session -> nx_secure_tls_credentials,
tls_session -> nx_secure_tls_socket_type,
&tls_session -> nx_secure_tls_received_remote_credentials, tls_session -> nx_secure_public_cipher_metadata_area,
tls_session -> nx_secure_public_cipher_metadata_size, NX_NULL);
#endif
return(status);
}
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