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/*
* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* @file mbedtls_platform.c
* @brief Implements mbed TLS platform functions for FreeRTOS.
*/
/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "FreeRTOS_Sockets.h"
/* mbed TLS includes. */
#include "mbedtls_config.h"
#include "threading_alt.h"
#include "mbedtls/entropy.h"
/*-----------------------------------------------------------*/
void * mbedtls_platform_calloc( size_t nmemb,
size_t size )
{
size_t totalSize = nmemb * size;
void * pBuffer = NULL;
/* Check that neither nmemb nor size were 0. */
if( totalSize > 0 )
{
/* Overflow check. */
if( totalSize / size == nmemb )
{
pBuffer = pvPortMalloc( totalSize );
if( pBuffer != NULL )
{
( void ) memset( pBuffer, 0x00, totalSize );
}
}
}
return pBuffer;
}
/*-----------------------------------------------------------*/
void mbedtls_platform_free( void * ptr )
{
vPortFree( ptr );
}
/*-----------------------------------------------------------*/
int mbedtls_platform_send( void * ctx,
const unsigned char * buf,
size_t len )
{
Socket_t socket = ctx;
return ( int ) FreeRTOS_send( socket, buf, len, 0 );
}
/*-----------------------------------------------------------*/
int mbedtls_platform_recv( void * ctx,
unsigned char * buf,
size_t len )
{
Socket_t socket = ctx;
return ( int ) FreeRTOS_recv( socket, buf, len, 0 );
}
/*-----------------------------------------------------------*/
void mbedtls_platform_mutex_init( mbedtls_threading_mutex_t * pMutex )
{
/* Create a statically-allocated FreeRTOS mutex. This should never fail as
* storage is provided. */
pMutex->mutexHandle = xSemaphoreCreateMutexStatic( &( pMutex->mutexStorage ) );
configASSERT( pMutex->mutexHandle != NULL );
}
/*-----------------------------------------------------------*/
void mbedtls_platform_mutex_free( mbedtls_threading_mutex_t * pMutex )
{
/* Nothing needs to be done to free a statically-allocated FreeRTOS mutex. */
( void ) pMutex;
}
/*-----------------------------------------------------------*/
int mbedtls_platform_mutex_lock( mbedtls_threading_mutex_t * pMutex )
{
BaseType_t mutexStatus = 0;
/* mutexStatus is not used if asserts are disabled. */
( void ) mutexStatus;
/* This function should never fail if the mutex is initialized. */
mutexStatus = xSemaphoreTake( pMutex->mutexHandle, portMAX_DELAY );
configASSERT( mutexStatus == pdTRUE );
return 0;
}
/*-----------------------------------------------------------*/
int mbedtls_platform_mutex_unlock( mbedtls_threading_mutex_t * pMutex )
{
BaseType_t mutexStatus = 0;
/* mutexStatus is not used if asserts are disabled. */
( void ) mutexStatus;
/* This function should never fail if the mutex is initialized. */
mutexStatus = xSemaphoreGive( pMutex->mutexHandle );
configASSERT( mutexStatus == pdTRUE );
return 0;
}
/*-----------------------------------------------------------*/
int mbedtls_platform_entropy_poll( void * data,
unsigned char * output,
size_t len,
size_t * olen )
{
int status = 0;
NTSTATUS rngStatus = 0;
/* Context is not used by this function. */
( void ) data;
/* TLS requires a secure random number generator; use the RNG provided
* by Windows. This function MUST be re-implemented for other platforms. */
rngStatus = BCryptGenRandom( NULL, output, len, BCRYPT_USE_SYSTEM_PREFERRED_RNG );
if( rngStatus == 0 )
{
/* All random bytes generated. */
*olen = len;
}
else
{
/* RNG failure. */
*olen = 0;
status = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
}
return status;
}
/*-----------------------------------------------------------*/
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