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/**************************************************************************/
/* */
/* 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"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_psk_add PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function adds a pre-shared key (PSK) to a TLS session for use */
/* with a PSK ciphersuite. The second parameter is the PSK identity */
/* used during the TLS handshake to select the proper key. */
/* */
/* INPUT */
/* */
/* tls_session Pointer to TLS Session */
/* pre_shared_key Pointer to PSK data */
/* psk_length Length of PSK data */
/* psk_identity PSK identity data */
/* identity_length Length of identity data */
/* hint PSK hint data */
/* hint_length Length of hint data */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* tx_mutex_get Get protection mutex */
/* tx_mutex_put Put protection mutex */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), improved */
/* buffer length verification, */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
#if defined(NX_SECURE_ENABLE_PSK_CIPHERSUITES) || defined(NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE)
UINT _nx_secure_tls_psk_add(NX_SECURE_TLS_SESSION *tls_session, UCHAR *pre_shared_key,
UINT psk_length, UCHAR *psk_identity, UINT identity_length, UCHAR *hint,
UINT hint_length)
{
UINT status;
UINT current_index;
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
current_index = tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_count;
/* Make sure we have space to add the PSK and its identity data. */
if ((current_index + 1) < NX_SECURE_TLS_MAX_PSK_KEYS &&
psk_length < NX_SECURE_TLS_MAX_PSK_SIZE &&
identity_length < NX_SECURE_TLS_MAX_PSK_ID_SIZE &&
hint_length <= NX_SECURE_TLS_MAX_PSK_ID_SIZE)
{
/* Save off the PSK and its length. */
NX_SECURE_MEMCPY(tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[current_index].nx_secure_tls_psk_data, pre_shared_key, psk_length); /* Use case of memcpy is verified. */
tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[current_index].nx_secure_tls_psk_data_size = psk_length;
/* Save off the identity and its length. */
NX_SECURE_MEMCPY(tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[current_index].nx_secure_tls_psk_id, psk_identity, identity_length); /* Use case of memcpy is verified. */
tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[current_index].nx_secure_tls_psk_id_size = identity_length;
/* Save off the identity and its length. */
NX_SECURE_MEMCPY(tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[current_index].nx_secure_tls_psk_id_hint, hint, hint_length); /* Use case of memcpy is verified. */
tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[current_index].nx_secure_tls_psk_id_hint_size = hint_length;
/* Increment the session counter. */
tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_count = current_index + 1;
status = NX_SUCCESS;
}
else
{
/* Can't add any more PSKs. */
status = NX_SECURE_TLS_NO_MORE_PSK_SPACE;
}
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
return(status);
}
#endif
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