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