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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_ciphersuite_lookup PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function returns data about a selected ciphersuite for use */
/* in various TLS internal functions, such as the ciphers used and */
/* associated key sizes. */
/* */
/* INPUT */
/* */
/* tls_session TLS session control block */
/* ciphersuite Ciphersuite value */
/* info Pointer to ciphersuite info */
/* structure (output) */
/* priority Priority index of ciphersuite */
/* in the ciphersuite table */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_process_clienthello Process ClientHello */
/* _nx_secure_tls_process_clienthello Process ClientHello */
/* _nx_secure_tls_process_serverhello Process ServerHello */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), return */
/* priority of selected suite, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nx_secure_tls_ciphersuite_lookup(NX_SECURE_TLS_SESSION *tls_session, UINT ciphersuite,
NX_SECURE_TLS_CIPHERSUITE_INFO const **info, USHORT *priority)
{
USHORT index;
NX_SECURE_TLS_CIPHERSUITE_INFO *cipher_table;
USHORT cipher_table_size;
cipher_table = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_ciphersuite_lookup_table;
cipher_table_size = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_ciphersuite_lookup_table_size;
/* The number of ciphersuites is very small so a linear search should be fine. */
for (index = 0; index < cipher_table_size; ++index)
{
/* See if the ciphersuite is supported. */
if (cipher_table[index].nx_secure_tls_ciphersuite == ciphersuite)
{
/* Return the ciphersuite information. */
*info = &cipher_table[index];
/* Return the priority index (lower number == higher priority). */
*priority = index;
return(NX_SUCCESS);
}
}
/* No ciphersuite found, suite unknown. */
return(NX_SECURE_TLS_UNKNOWN_CIPHERSUITE);
}