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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"
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_tls_find_curve_method PORTABLE C */
/* 6.1.6 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function finds the curve method for the specified named curve */
/* ID. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* named_curve Named curve ID */
/* curve_method Pointer to hold the curve */
/* method */
/* curve_priority Pointer to return value for */
/* priority value */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_secure_tls_generate_premaster_secret */
/* Generate Pre-Master Secret */
/* _nx_secure_tls_process_certificate_verify */
/* Process CertificateVerify */
/* _nx_secure_tls_proc_clienthello_sec_sa_extension */
/* Process supported groups */
/* extensions in ClientHello */
/* _nx_secure_tls_process_client_key_exchange */
/* Process ClientKeyExchange */
/* _nx_secure_tls_process_server_key_exchange */
/* Process ServerKeyExchange */
/* _nx_secure_tls_send_certificate_verify */
/* Send CertificateVerify */
/* _nx_secure_tls_send_server_key_exchange */
/* Send ServerKeyExchange */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), added */
/* curve priority return value,*/
/* resulting in version 6.1 */
/* 04-02-2021 Timothy Stapko Modified comment(s), added */
/* ECC curve table in X509, */
/* resulting in version 6.1.6 */
/* */
/**************************************************************************/
UINT _nx_secure_tls_find_curve_method(NX_SECURE_TLS_SESSION *tls_session,
USHORT named_curve, const NX_CRYPTO_METHOD **curve_method, UINT *curve_priority)
{
USHORT i;
*curve_method = NX_NULL;
/* Find out the curve method for the named curve. */
for (i = 0; i < tls_session -> nx_secure_tls_ecc.nx_secure_tls_ecc_supported_groups_count; i++)
{
if (named_curve == tls_session -> nx_secure_tls_ecc.nx_secure_tls_ecc_supported_groups[i])
{
*curve_method = tls_session -> nx_secure_tls_ecc.nx_secure_tls_ecc_curves[i];
/* The index in the supported list is the curve priority: lower value == higher priority. */
if(curve_priority != NX_NULL)
{
*curve_priority = i;
}
break;
}
}
if (*curve_method == NX_NULL)
{
return(NX_CRYTPO_MISSING_ECC_CURVE);
}
return(NX_SUCCESS);
}
#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */