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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 */
/** */
/** Datagram Transport Layer Security (DTLS) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_dtls.h"
#ifdef NX_SECURE_ENABLE_DTLS
#ifdef NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE
extern NX_CRYPTO_METHOD crypto_method_ec_secp256;
#endif /* NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE */
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
static UINT _nx_secure_dtls_check_ciphersuite(const NX_SECURE_TLS_CIPHERSUITE_INFO *ciphersuite_info,
NX_SECURE_X509_CERT *cert, UINT selected_curve,
UINT cert_curve_supported);
#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_dtls_process_clienthello PORTABLE C */
/* 6.1.3 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes an incoming ClientHello message from a */
/* remote host, kicking off a DTLS handshake. */
/* */
/* INPUT */
/* */
/* dtls_session DTLS control block */
/* packet_buffer Pointer to message data */
/* message_length Length of message data (bytes)*/
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_tls_check_protocol_version Check protocol version */
/* _nx_secure_tls_ciphersuite_lookup Get cipher information */
/* _nx_secure_tls_proc_clienthello_sec_sa_extension */
/* Process ECC extensions */
/* _nx_secure_dtls_check_ciphersuite Check if ECC suite is usable */
/* _nx_secure_x509_local_device_certificate_get */
/* Get the local certificate */
/* [nx_crypto_init] Initialize crypto */
/* [nx_crypto_operation] Crypto operation */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_server_handshake DTLS server state machine */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), added */
/* priority ciphersuite logic, */
/* verified memcpy use cases, */
/* fixed configuration problem */
/* that would result in */
/* compiler error, fixed */
/* renegotiation bug, */
/* improved negotiation logic, */
/* resulting in version 6.1 */
/* 12-31-2020 Timothy Stapko Modified comment(s), */
/* improved buffer length */
/* verification, */
/* resulting in version 6.1.3 */
/* */
/**************************************************************************/
UINT _nx_secure_dtls_process_clienthello(NX_SECURE_DTLS_SESSION *dtls_session, UCHAR *packet_buffer,
UINT message_length)
{
USHORT ciphersuite_list_length;
UCHAR compression_methods_length;
USHORT cipher_entry;
UCHAR session_id_length;
UINT i;
UINT status;
USHORT protocol_version;
UINT total_extensions_length;
const NX_SECURE_TLS_CIPHERSUITE_INFO *ciphersuite_info = NX_NULL;
USHORT ciphersuite_priority;
USHORT new_ciphersuite_priority = 0;
NX_SECURE_TLS_SESSION *tls_session;
NX_SECURE_TLS_HELLO_EXTENSION extension_data[NX_SECURE_TLS_HELLO_EXTENSIONS_MAX];
UINT num_extensions = NX_SECURE_TLS_HELLO_EXTENSIONS_MAX;
UCHAR *ciphersuite_list;
UCHAR *packet_buffer_start;
#ifdef NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE
INT extension_total_length;
USHORT extension_length;
USHORT extension_type;
USHORT supported_ec_length;
UCHAR ec_point_formats_length;
UCHAR supported_ec_match, ec_point_formats_match, zkp_verified;
const NX_CRYPTO_METHOD *crypto_method;
NX_SECURE_TLS_PSK_STORE *psk_store;
#endif /* NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE */
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
NX_SECURE_X509_CERT *cert;
UINT selected_curve;
UINT cert_curve;
UINT cert_curve_supported;
NX_SECURE_EC_PUBLIC_KEY *ec_pubkey;
NX_SECURE_TLS_ECDHE_HANDSHAKE_DATA *ecdhe_data;
#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */
/* Structure of ClientHello:
* | 2 | 4 + 28 | 1 | <SID len> | 2 | <CS Len> | 1 | <Comp Len> | 2 | <Ext. Len> |
* | TLS version | Random (time + random) | SID length | Session ID | CS Len | Ciphersuites |Comp Len | Compression |Ext. Len | Extensions |
*/
if (message_length < 38)
{
/* Message was not the minimum required size for a ClientHello. */
return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH);
}
/* Get a pointer to the start of our packet buffer so we can read ahead later. */
packet_buffer_start = packet_buffer;
/* Get a reference to TLS state. */
tls_session = &dtls_session -> nx_secure_dtls_tls_session;
/* If we are currently in a session, we have a renegotiation handshake. */
if (tls_session -> nx_secure_tls_local_session_active)
{
/* Session renegotiation is disabled, send a "no_renegotiation" alert! */
return(NX_SECURE_TLS_NO_RENEGOTIATION_ERROR);
}
/* Client is establishing a TLS session with our server. */
/* Extract the protocol version - only part of the ClientHello message. */
protocol_version = (USHORT)(((USHORT)packet_buffer[0] << 8) | packet_buffer[1]);
packet_buffer += 2;
/* Check protocol version provided by client. */
status = _nx_secure_tls_check_protocol_version(tls_session, protocol_version, NX_SECURE_DTLS);
if (status != NX_SECURE_TLS_SUCCESS)
{
/* If we have an active session, this is a renegotiation attempt, treat the protocol error as
if we are starting a new session. */
if (status == NX_SECURE_TLS_UNSUPPORTED_TLS_VERSION || tls_session -> nx_secure_tls_local_session_active)
{
/* If the version isn't supported, it's not an issue - TLS is backward-compatible,
* so pick the highest version we do support. If the version isn't recognized,
* flag an error. */
_nx_secure_tls_highest_supported_version_negotiate(tls_session, &protocol_version, NX_SECURE_DTLS);
if (protocol_version == 0x0)
{
/* Error, no versions enabled. */
return(NX_SECURE_TLS_UNSUPPORTED_TLS_VERSION);
}
}
else
{
/* Protocol version unknown (not TLS or SSL!), return status. */
return(status);
}
}
/* Assign our protocol version to our socket. This is used for all further communications
* in this session. */
tls_session -> nx_secure_tls_protocol_version = protocol_version;
/* Save off the random value for key generation later. */
NX_SECURE_MEMCPY(tls_session -> nx_secure_tls_key_material.nx_secure_tls_client_random, packet_buffer, NX_SECURE_TLS_RANDOM_SIZE); /* Use case of memcpy is verified. */
packet_buffer += NX_SECURE_TLS_RANDOM_SIZE;
/* Extract the session ID if there is one. */
session_id_length = packet_buffer[0];
packet_buffer++;
/* If there is a session ID, copy it into our TLS socket structure. */
tls_session -> nx_secure_tls_session_id_length = session_id_length;
if (session_id_length > 0)
{
NX_SECURE_MEMCPY(tls_session -> nx_secure_tls_session_id, &packet_buffer[0], session_id_length); /* Use case of memcpy is verified. */
packet_buffer += session_id_length;
}
/* DTLS - there might be a cookie we need to save. */
/* Extract the cookie from the client. */
dtls_session -> nx_secure_dtls_cookie_length = packet_buffer[0];
packet_buffer += 1;
if (dtls_session -> nx_secure_dtls_cookie_length > sizeof(dtls_session -> nx_secure_dtls_cookie))
{
return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH);
}
if (dtls_session -> nx_secure_dtls_cookie_length > 0)
{
NX_SECURE_MEMCPY(dtls_session -> nx_secure_dtls_cookie, packet_buffer, dtls_session -> nx_secure_dtls_cookie_length); /* Use case of memcpy is verified. */
packet_buffer += dtls_session -> nx_secure_dtls_cookie_length;
}
/* Negotiate the ciphersuite we want to use. */
ciphersuite_list_length = (USHORT)((packet_buffer[0] << 8) + packet_buffer[1]);
packet_buffer += 2;
/* Make sure the list length makes sense. */
if (ciphersuite_list_length > message_length)
{
return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH);
}
ciphersuite_list = packet_buffer;
packet_buffer += ciphersuite_list_length;
/* Compression methods length - one byte. For now we only support the NULL method. */
compression_methods_length = packet_buffer[0];
packet_buffer += 1;
/* Message length overflow. */
if (((UINT)(packet_buffer - packet_buffer_start + compression_methods_length)) > message_length)
{
return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH);
}
/* Make sure NULL compression method is supported. */
status = NX_SECURE_TLS_BAD_COMPRESSION_METHOD;
for (i = 0; i < compression_methods_length; ++i)
{
if (packet_buffer[i] == 0x0)
{
status = NX_SUCCESS;
break;
}
}
/* Check for error. */
if (status != NX_SUCCESS)
{
return(status);
}
packet_buffer += compression_methods_length;
/* Padding data? */
if (message_length >= (UINT)(packet_buffer - packet_buffer_start + 2))
{
/* TLS Extensions come next. Get the total length of all extensions first. */
total_extensions_length = (USHORT)((packet_buffer[0] << 8) + packet_buffer[1]);
/* Message length overflow. */
if (((UINT)(packet_buffer - packet_buffer_start + 2) + total_extensions_length) > message_length)
{
return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH);
}
if (total_extensions_length > 0)
{
/* Process serverhello extensions. */
status = _nx_secure_tls_process_clienthello_extensions(tls_session, &packet_buffer[2], total_extensions_length, extension_data, &num_extensions, packet_buffer, message_length);
/* Check for error. */
if (status != NX_SUCCESS)
{
return(status);
}
/* If the server callback is set, invoke it now with the extensions that require application input. */
if (tls_session -> nx_secure_tls_session_server_callback != NX_NULL)
{
status = tls_session -> nx_secure_tls_session_server_callback(tls_session, extension_data, num_extensions);
/* Check for error. */
if (status != NX_SUCCESS)
{
return(status);
}
}
}
}
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
/* Get the local certificate. */
if (tls_session -> nx_secure_tls_credentials.nx_secure_tls_active_certificate != NX_NULL)
{
cert = tls_session -> nx_secure_tls_credentials.nx_secure_tls_active_certificate;
}
else
{
/* Get reference to local device certificate. NX_NULL is passed for name to get default entry. */
status = _nx_secure_x509_local_device_certificate_get(&tls_session -> nx_secure_tls_credentials.nx_secure_tls_certificate_store,
NX_NULL, &cert);
if (status != NX_SUCCESS)
{
cert = NX_NULL;
}
}
if (cert != NX_NULL && cert -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_EC)
{
ec_pubkey = &cert -> nx_secure_x509_public_key.ec_public_key;
cert_curve = ec_pubkey -> nx_secure_ec_named_curve;
}
else
{
cert_curve = 0;
}
ecdhe_data = (NX_SECURE_TLS_ECDHE_HANDSHAKE_DATA *)tls_session -> nx_secure_tls_key_material.nx_secure_tls_new_key_material_data;
/* Parse the ECC extension of supported curve. */
status = _nx_secure_tls_proc_clienthello_sec_sa_extension(tls_session,
extension_data,
num_extensions,
&selected_curve,
(USHORT)cert_curve, &cert_curve_supported,
&ecdhe_data -> nx_secure_tls_ecdhe_signature_algorithm,
cert);
ecdhe_data -> nx_secure_tls_ecdhe_named_curve = selected_curve;
/* Select signature algorithm by certificate type. */
if (cert != NX_NULL && cert -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_EC)
{
ecdhe_data -> nx_secure_tls_ecdhe_signature_algorithm =
(USHORT)((ecdhe_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF00) | NX_SECURE_TLS_SIGNATURE_ALGORITHM_ECDSA);
if (cert_curve_supported == NX_FALSE)
{
/* The named curve in our server certificate is not supported by the client. */
return(NX_SECURE_TLS_NO_SUPPORTED_CIPHERS);
}
}
else if (cert != NX_NULL && cert -> nx_secure_x509_public_algorithm == NX_SECURE_TLS_X509_TYPE_RSA)
{
ecdhe_data -> nx_secure_tls_ecdhe_signature_algorithm =
(USHORT)((ecdhe_data -> nx_secure_tls_ecdhe_signature_algorithm & 0xFF00) | NX_SECURE_TLS_SIGNATURE_ALGORITHM_RSA);
}
#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */
/* Set our initial priority to the maximum value - the size of our ciphersuite crypto table. */
ciphersuite_priority = (USHORT)(0xFFFFFFFF);
for (i = 0; i < ciphersuite_list_length; i += 2)
{
/* Loop through list of acceptable ciphersuites. */
cipher_entry = (USHORT)((ciphersuite_list[i] << 8) + ciphersuite_list[i + 1]);
status = _nx_secure_tls_ciphersuite_lookup(tls_session, cipher_entry, &ciphersuite_info, &new_ciphersuite_priority);
if (status == NX_SUCCESS && (new_ciphersuite_priority < ciphersuite_priority))
{
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
if (NX_SUCCESS == _nx_secure_dtls_check_ciphersuite(ciphersuite_info, cert, selected_curve, cert_curve_supported))
#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */
{
tls_session -> nx_secure_tls_session_ciphersuite = ciphersuite_info;
ciphersuite_priority = new_ciphersuite_priority;
}
}
}
/* See if we found an acceptable ciphersuite. */
if (tls_session -> nx_secure_tls_session_ciphersuite == NX_NULL)
{
/* No supported ciphersuites found. */
return(NX_SECURE_TLS_NO_SUPPORTED_CIPHERS);
}
#ifdef NX_SECURE_ENABLE_ECJPAKE_CIPHERSUITE
/* Check if there are extensions. */
if ((ciphersuite_info -> nx_secure_tls_public_auth -> nx_crypto_algorithm == NX_CRYPTO_KEY_EXCHANGE_ECJPAKE) &&
(dtls_session -> nx_secure_dtls_cookie_length != 0))
{
if (packet_buffer - packet_buffer_start > (INT)message_length - 2)
{
return(NX_SECURE_TLS_HANDSHAKE_FAILURE);
}
extension_total_length = (packet_buffer[0] << 8) + packet_buffer[1];
packet_buffer += 2;
/* Make sure the extension length make sense. */
if (packet_buffer - packet_buffer_start + extension_total_length > (INT)message_length)
{
return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH);
}
supported_ec_match = 0;
ec_point_formats_match = 0;
zkp_verified = 0;
crypto_method = ciphersuite_info -> nx_secure_tls_public_auth;
if (crypto_method == NX_NULL)
{
return(NX_SECURE_TLS_HANDSHAKE_FAILURE);
}
if (crypto_method -> nx_crypto_init == NX_NULL)
{
return(NX_SECURE_TLS_HANDSHAKE_FAILURE);
}
if (tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_count == 0)
{
return(NX_SECURE_TLS_HANDSHAKE_FAILURE);
}
psk_store = &tls_session -> nx_secure_tls_credentials.nx_secure_tls_psk_store[0];
status = crypto_method -> nx_crypto_init((NX_CRYPTO_METHOD*)crypto_method,
psk_store -> nx_secure_tls_psk_data,
(USHORT)(psk_store -> nx_secure_tls_psk_data_size << 3),
NX_NULL,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size);
if (status)
{
return(status);
}
status = crypto_method -> nx_crypto_operation(NX_CRYPTO_ECJPAKE_HASH_METHOD_SET,
NX_NULL,
(NX_CRYPTO_METHOD*)crypto_method,
NX_NULL,
(USHORT)(tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_metadata_size << 3),
(UCHAR *)(tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_sha256_method),
sizeof(NX_CRYPTO_METHOD),
NX_NULL, NX_NULL, 0,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if (status)
{
return(status);
}
status = crypto_method -> nx_crypto_operation(NX_CRYPTO_ECJPAKE_CURVE_SET,
NX_NULL,
(NX_CRYPTO_METHOD*)crypto_method,
NX_NULL, 0,
(UCHAR *)&crypto_method_ec_secp256,
sizeof(NX_CRYPTO_METHOD),
NX_NULL, NX_NULL, 0,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if (status)
{
return(status);
}
/* Loop through all the extensions. */
while (extension_total_length > 0)
{
/* Get Extension Type. */
extension_type = (USHORT)((packet_buffer[0] << 8) + packet_buffer[1]);
packet_buffer += 2;
/* Get Extension Length. */
extension_length = (USHORT)((packet_buffer[0] << 8) + packet_buffer[1]);
packet_buffer += 2;
extension_total_length -= 4;
/* Make sure Extension Length is within the total extension length. */
if (extension_length > extension_total_length)
{
return(NX_SECURE_TLS_INCORRECT_MESSAGE_LENGTH);
}
extension_total_length -= extension_length;
switch (extension_type)
{
case NX_SECURE_TLS_EXTENSION_EC_GROUPS:
/* Supported Elliptic Curves Extension. */
supported_ec_length = (USHORT)((packet_buffer[0] << 8) + packet_buffer[1]);
packet_buffer += 2;
/* Make sure secp256r1 (23) format is supported. */
status = NX_SECURE_TLS_UNSUPPORTED_CIPHER;
for (i = 0; i < (UINT)(supported_ec_length >> 1); ++i)
{
if (packet_buffer[i * 2] == 0x0 && packet_buffer[i * 2 + 1] == 0x17)
{
status = NX_SUCCESS;
break;
}
}
/* Check for error. */
if (status != NX_SUCCESS)
{
return(status);
}
packet_buffer += supported_ec_length;
supported_ec_match = 1;
break;
case NX_SECURE_TLS_EXTENSION_EC_POINT_FORMATS:
/* ec_point_formats Extension. */
ec_point_formats_length = packet_buffer[0];
packet_buffer += 1;
/* Make sure uncompressed (0) format is supported. */
status = NX_SECURE_TLS_UNSUPPORTED_CIPHER;
for (i = 0; i < ec_point_formats_length; ++i)
{
if (packet_buffer[i] == 0x0)
{
status = NX_SUCCESS;
break;
}
}
/* Check for error. */
if (status != NX_SUCCESS)
{
return(status);
}
packet_buffer += ec_point_formats_length;
ec_point_formats_match = 1;
break;
case NX_SECURE_TLS_EXTENSION_ECJPAKE_KEY_KP_PAIR:
/* ecjpake_key_kp_pair Extension. */
status = crypto_method -> nx_crypto_operation(NX_CRYPTO_ECJPAKE_CLIENT_HELLO_PROCESS,
NX_NULL,
(NX_CRYPTO_METHOD*)crypto_method,
NX_NULL, 0,
packet_buffer, extension_length,
NX_NULL, NX_NULL, 0,
tls_session -> nx_secure_public_auth_metadata_area,
tls_session -> nx_secure_public_auth_metadata_size,
NX_NULL, NX_NULL);
if (status)
{
return(status);
}
packet_buffer += extension_length;
zkp_verified = 1;
break;
}
}
/* Make sure no extension is missing. */
if (supported_ec_match == 0 || ec_point_formats_match == 0 || zkp_verified == 0)
{
return(NX_SECURE_TLS_UNSUPPORTED_ECC_FORMAT);
}
}
#endif
#ifdef NX_SECURE_TLS_SERVER_DISABLED
/* If TLS Server is disabled and we have processed a ClientHello, something is wrong... */
tls_session -> nx_secure_tls_client_state = NX_SECURE_TLS_CLIENT_STATE_ERROR;
return(NX_SECURE_TLS_INVALID_STATE);
#else
if (dtls_session -> nx_secure_dtls_cookie_length == 0)
{
/* In DTLS, we actually send a HelloVerifyReqeust (expecting a second ClientHello in
* response) before sending our ServerHello. */
dtls_session -> nx_secure_dtls_tls_session.nx_secure_tls_server_state = NX_SECURE_TLS_SERVER_STATE_SEND_HELLO_VERIFY;
}
else
{
dtls_session -> nx_secure_dtls_tls_session.nx_secure_tls_server_state = NX_SECURE_TLS_SERVER_STATE_SEND_HELLO;
}
return(NX_SUCCESS);
#endif
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_dtls_check_ciphersuite PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks whether the specified ciphersuite is */
/* suitable for the server certificate, the curve in the certificate */
/* and the common shared curve. */
/* */
/* INPUT */
/* */
/* ciphersuite_info The specified cipher suite */
/* cert Local server certificate */
/* selected_curve Curve selected for ECC */
/* cert_curve_supported If cert curve is supported */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_process_clienthello Process ClientHello */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
#ifdef NX_SECURE_ENABLE_ECC_CIPHERSUITE
static UINT _nx_secure_dtls_check_ciphersuite(const NX_SECURE_TLS_CIPHERSUITE_INFO *ciphersuite_info,
NX_SECURE_X509_CERT *cert, UINT selected_curve,
UINT cert_curve_supported)
{
if (ciphersuite_info -> nx_secure_tls_public_cipher == NX_NULL)
{
return(NX_SUCCESS);
}
if (ciphersuite_info -> nx_secure_tls_public_auth == NX_NULL)
{
return(NX_SUCCESS);
}
switch (ciphersuite_info -> nx_secure_tls_public_cipher -> nx_crypto_algorithm)
{
case NX_CRYPTO_KEY_EXCHANGE_ECDHE:
if (selected_curve == NX_NULL || cert == NX_NULL)
{
/* No common named curve supported for ECDHE. */
return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER);
}
if (ciphersuite_info -> nx_secure_tls_public_auth -> nx_crypto_algorithm == NX_CRYPTO_DIGITAL_SIGNATURE_ECDSA)
{
if (cert -> nx_secure_x509_public_algorithm != NX_SECURE_TLS_X509_TYPE_EC)
{
/* ECDSA auth requires EC certificate. */
return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER);
}
}
else
{
if (cert -> nx_secure_x509_public_algorithm != NX_SECURE_TLS_X509_TYPE_RSA)
{
/* RSA auth requires RSA certificate. */
return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER);
}
}
break;
case NX_CRYPTO_KEY_EXCHANGE_ECDH:
/* Check for ECDH_anon. */
if (ciphersuite_info -> nx_secure_tls_public_auth -> nx_crypto_algorithm == NX_CRYPTO_DIGITAL_SIGNATURE_ANONYMOUS)
{
if (selected_curve == NX_NULL)
{
/* No common named curve supported supported. */
return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER);
}
}
else
{
/* ECDH key exchange requires an EC certificate. */
if (cert == NX_NULL || cert -> nx_secure_x509_public_algorithm != NX_SECURE_TLS_X509_TYPE_EC)
{
return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER);
}
if (cert_curve_supported == NX_FALSE)
{
return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER);
}
/* Check the signatureAlgorithm of the certificate to determine the public auth algorithm. */
if (ciphersuite_info -> nx_secure_tls_public_auth -> nx_crypto_algorithm == NX_CRYPTO_DIGITAL_SIGNATURE_ECDSA)
{
if (cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_ECDSA_SHA_1 &&
cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_ECDSA_SHA_224 &&
cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_ECDSA_SHA_256 &&
cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_ECDSA_SHA_384 &&
cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_ECDSA_SHA_512)
{
return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER);
}
}
else
{
if (cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_RSA_MD5 &&
cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_RSA_SHA_1 &&
cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_RSA_SHA_256 &&
cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_RSA_SHA_384 &&
cert -> nx_secure_x509_signature_algorithm != NX_SECURE_TLS_X509_TYPE_RSA_SHA_512)
{
return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER);
}
}
}
break;
case NX_CRYPTO_KEY_EXCHANGE_RSA:
if (cert == NX_NULL || cert -> nx_secure_x509_public_algorithm != NX_SECURE_TLS_X509_TYPE_RSA)
{
/* RSA key exchange requires RSA certificate. */
return(NX_SECURE_TLS_UNSUPPORTED_PUBLIC_CIPHER);
}
break;
default:
break;
}
return(NX_SUCCESS);
}
#endif /* NX_SECURE_ENABLE_ECC_CIPHERSUITE */
#endif /* NX_SECURE_ENABLE_DTLS */
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