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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_handshake_hash_init PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function initializes the hash function states needed for the */
/* TLS Finished message handshake hash. */
/* */
/* INPUT */
/* */
/* tls_session TLS control block */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* [nx_crypto_operation] Hash initialization functions */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_send_clienthello Send ClientHello */
/* _nx_secure_dtls_server_handshake DTLS server state machine */
/* _nx_secure_tls_send_clienthello Send ClientHello */
/* _nx_secure_tls_server_handshake TLS 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), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _nx_secure_tls_handshake_hash_init(NX_SECURE_TLS_SESSION *tls_session)
{
const NX_CRYPTO_METHOD *method_ptr;
UINT status;
VOID *handler = NX_NULL;
VOID *metadata;
UINT metadata_size;
/* We need to hash all of the handshake messages that we receive and send. When sending a ClientHello,
we need to initialize the hashes (TLS 1.1 uses both MD5 and SHA-1, TLS 1.2 uses SHA-256). The final
hash is generated in the "Finished" message.
TLS 1.3 does things a little differently - the handshake hash is the same as that of the chosen
ciphersuite, so */
#if (NX_SECURE_TLS_TLS_1_3_ENABLED)
if(tls_session->nx_secure_tls_1_3)
{
/* Hash handshake record using ciphersuite hash routine. */
if (tls_session -> nx_secure_tls_session_ciphersuite == NX_NULL)
{
/* Set the hash method to the default of SHA-256 if no ciphersuite is available. */
method_ptr = tls_session -> nx_secure_tls_crypto_table->nx_secure_tls_handshake_hash_sha256_method;
}
else
{
/* The handshake transcript hash in TLS 1.3 uses the hash routine associated with the chosen ciphersuite. */
method_ptr = tls_session -> nx_secure_tls_session_ciphersuite -> nx_secure_tls_hash;
}
/* Generate the "transcript hash" for the point in the handshake where this message falls.
* This is needed for TLS 1.3 key generation which uses the hash of all previous handshake
* messages at multiple points during the handshake. Instead of saving the entirety of the
* handshake messages, just generate a hash when each record is hashed. */
/* The handshake transcript hash in TLS 1.3 uses the hash routine associated with the chosen ciphersuite. */
metadata = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_metadata;
metadata_size = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_metadata_size;
if (method_ptr -> nx_crypto_init)
{
status = method_ptr -> nx_crypto_init((NX_CRYPTO_METHOD*)method_ptr,
NX_NULL,
0,
&handler,
metadata,
metadata_size);
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_handler = handler;
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
if (method_ptr -> nx_crypto_operation != NX_NULL)
{
status = method_ptr -> nx_crypto_operation(NX_CRYPTO_HASH_INITIALIZE,
handler,
(NX_CRYPTO_METHOD*)method_ptr,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
NX_NULL,
0,
metadata,
metadata_size,
NX_NULL,
NX_NULL);
}
return(status);
}
#endif
/* Initialize both the handshake "finished" hashes - TLS 1.1 uses both SHA-1 and MD5, TLS 1.2 uses SHA-256 by default.
At this point we don't yet know the version we will use, so initialize all of them. */
/* Hash is determined by ciphersuite in TLS 1.2. Default is SHA-256. */
#if (NX_SECURE_TLS_TLS_1_2_ENABLED)
if (tls_session -> nx_secure_tls_supported_versions & (USHORT)(NX_SECURE_TLS_BITFIELD_VERSION_1_2))
{
method_ptr = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_sha256_method;
metadata = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_metadata;
metadata_size = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_metadata_size;
if (method_ptr -> nx_crypto_init)
{
status = method_ptr -> nx_crypto_init((NX_CRYPTO_METHOD*)method_ptr,
NX_NULL,
0,
&handler,
metadata,
metadata_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha256_handler = handler;
}
if (method_ptr -> nx_crypto_operation != NX_NULL)
{
status = method_ptr -> nx_crypto_operation(NX_CRYPTO_HASH_INITIALIZE,
handler,
(NX_CRYPTO_METHOD*)method_ptr,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
NX_NULL,
0,
metadata,
metadata_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
}
#endif
#if (NX_SECURE_TLS_TLS_1_0_ENABLED || NX_SECURE_TLS_TLS_1_1_ENABLED)
if (tls_session -> nx_secure_tls_supported_versions & (USHORT)(NX_SECURE_TLS_BITFIELD_VERSION_1_0 | NX_SECURE_TLS_BITFIELD_VERSION_1_1))
{
/* TLS 1.0 and 1.1 use both MD5 and SHA-1. */
method_ptr = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_md5_method;
metadata = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_md5_metadata;
metadata_size = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_md5_metadata_size;
if (method_ptr -> nx_crypto_init)
{
status = method_ptr -> nx_crypto_init((NX_CRYPTO_METHOD*)method_ptr,
NX_NULL,
0,
&handler,
metadata,
metadata_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_md5_handler = handler;
}
if (method_ptr -> nx_crypto_operation != NX_NULL)
{
status = method_ptr -> nx_crypto_operation(NX_CRYPTO_HASH_INITIALIZE,
handler,
(NX_CRYPTO_METHOD*)method_ptr,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
NX_NULL,
0,
metadata,
metadata_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
method_ptr = tls_session -> nx_secure_tls_crypto_table -> nx_secure_tls_handshake_hash_sha1_method;
metadata = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha1_metadata;
metadata_size = tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha1_metadata_size;
if (method_ptr -> nx_crypto_init)
{
status = method_ptr -> nx_crypto_init((NX_CRYPTO_METHOD*)method_ptr,
NX_NULL,
0,
&handler,
metadata,
metadata_size);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
tls_session -> nx_secure_tls_handshake_hash.nx_secure_tls_handshake_hash_sha1_handler = handler;
}
if (method_ptr -> nx_crypto_operation != NX_NULL)
{
status = method_ptr -> nx_crypto_operation(NX_CRYPTO_HASH_INITIALIZE,
handler,
(NX_CRYPTO_METHOD*)method_ptr,
NX_NULL,
0,
NX_NULL,
0,
NX_NULL,
NX_NULL,
0,
metadata,
metadata_size,
NX_NULL,
NX_NULL);
if(status != NX_CRYPTO_SUCCESS)
{
return(status);
}
}
}
#endif
return(NX_SUCCESS);
}