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Add a new sample application to test thread safety
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# mbed TLS threading example on mbed OS | ||
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This application tests the thread safety of mbed TLS within mbed OS. The computations are performed sequentially at first to generate a reference value. Thereafter the aplication performs the same computations in parallel to test thread safety. | ||
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## Getting started | ||
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Set up your environment if you have not done so already. For instructions, refer to the [main readme](../README.md). | ||
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## Monitoring the application | ||
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The output in the terminal window should be similar to this: | ||
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``` | ||
Thread 0: Starting threads one by one... | ||
Thread 1: Done. | ||
Thread 2: Done. | ||
Thread 0: Printing hash output... | ||
Thread 0: 2794387f922b5f36953b6e02e6f499b7e1dbd19accb199192e8fd3c98c5fae7eb4f31f3c996c4ab28689eb5f137a4b947fc56a79698ca8c6ea1d3efec678a82c | ||
Thread 0: Starting threads... | ||
Thread 3: Done. | ||
Thread 4: Done. | ||
Thread 0: Printing hash output... | ||
Thread 0: 2794387f922b5f36953b6e02e6f499b7e1dbd19accb199192e8fd3c98c5fae7eb4f31f3c996c4ab28689eb5f137a4b947fc56a79698ca8c6ea1d3efec678a82c | ||
Thread 0: Done. | ||
``` | ||
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If the second hash string doesn't match the first, then the thread safety measures are not working properly and this build of mbed TLS is not thread safe! |
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/* | ||
* An example of using mbed TLS in a thread safe manner | ||
* | ||
* Copyright (C) 2016, ARM Limited, All Rights Reserved | ||
* SPDX-License-Identifier: Apache-2.0 | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); you may | ||
* not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
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#include "mbed.h" | ||
#include "rtos.h" | ||
#include "mbedtls/entropy.h" | ||
#include "mbedtls/threading.h" | ||
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#define THREADS 2 | ||
#define ROUNDS 100 | ||
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#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) | ||
#define HASHSIZE 64 | ||
#else | ||
#define HASHSIZE 32 | ||
#endif | ||
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#define BUFSIZE 64 | ||
#define MAIN_ID 0 | ||
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#define THREAD_CHK(f) do { if( ( ret = f ) != osOK ) goto cleanup; } while( 0 ) | ||
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const unsigned char data[HASHSIZE] = { 0xaa }; | ||
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Mutex stdio_mutex; | ||
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mbedtls_entropy_context entropy; | ||
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void hexify( unsigned char *obuf, const unsigned char *ibuf, int len ) | ||
{ | ||
unsigned char l, h; | ||
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while( len != 0 ) | ||
{ | ||
h = *ibuf / 16; | ||
l = *ibuf % 16; | ||
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if( h < 10 ) | ||
*obuf++ = '0' + h; | ||
else | ||
*obuf++ = 'a' + h - 10; | ||
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if( l < 10 ) | ||
*obuf++ = '0' + l; | ||
else | ||
*obuf++ = 'a' + l - 10; | ||
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++ibuf; | ||
len--; | ||
} | ||
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*obuf = '\0'; | ||
} | ||
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void notify( const char* message, int thread_id, const int err_code ) | ||
{ | ||
stdio_mutex.lock(); | ||
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if( err_code ) | ||
printf( "Thread %d: ERR - %s: %d\n\r", thread_id, message, err_code ); | ||
else | ||
printf( "Thread %d: %s\n\r", thread_id, message ); | ||
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stdio_mutex.unlock(); | ||
} | ||
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void test_thread( void const *args ) | ||
{ | ||
int thread_id = *( (int*)args ); | ||
int ret = 0; | ||
int i; | ||
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for ( i = 0; i < ROUNDS; i++ ) | ||
{ | ||
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ret = mbedtls_entropy_update_manual( &entropy, data, BUFSIZE ); | ||
if( 0 != ret ) | ||
{ | ||
notify( "mbed TLS entropy update FAILED", thread_id, ret ); | ||
return; | ||
} | ||
} | ||
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notify( " Done.", thread_id, 0 ); | ||
} | ||
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int main( void ) | ||
{ | ||
unsigned char *hash = new unsigned char[HASHSIZE]; | ||
unsigned char *output = new unsigned char[2 * HASHSIZE + 1]; | ||
Thread thread[THREADS * 2]; | ||
int thread_id[THREADS * 2]; | ||
int ret, i; | ||
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/* | ||
* This calls mbedtls_threading_set_alt and tells the threading | ||
* abstraction layer in mbed TLS to use the mbed implementation. | ||
*/ | ||
mbedtls_threading_set_mbed(); | ||
mbedtls_entropy_init( &entropy ); | ||
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notify( "Starting threads one by one...", MAIN_ID, 0 ); | ||
for( i = 0; i < THREADS; i++ ) | ||
{ | ||
thread_id[i] = i + 1; | ||
THREAD_CHK( thread[i].start( mbed::callback( test_thread, &thread_id[i] ) ) ); | ||
THREAD_CHK( thread[i].join() ); | ||
} | ||
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#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) | ||
mbedtls_sha512_finish( &entropy.accumulator, hash ); | ||
#else | ||
mbedtls_sha256_finish( &entropy.accumulator, hash ); | ||
#endif | ||
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hexify( output, hash, HASHSIZE ); | ||
notify( "Printing hash output...", MAIN_ID, 0 ); | ||
notify( (char*)output, MAIN_ID, 0 ); | ||
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mbedtls_entropy_init( &entropy ); | ||
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notify( "Starting threads...", MAIN_ID, 0 ); | ||
for( i = THREADS; i < 2 * THREADS; i++ ) | ||
{ | ||
thread_id[i] = i + 1; | ||
THREAD_CHK( thread[i].start( mbed::callback( test_thread, &thread_id[i] ) ) ); | ||
} | ||
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for( i = THREADS; i < 2 * THREADS; i++ ) | ||
THREAD_CHK( thread[i].join() ); | ||
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#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR) | ||
mbedtls_sha512_finish( &entropy.accumulator, hash ); | ||
#else | ||
mbedtls_sha256_finish( &entropy.accumulator, hash ); | ||
#endif | ||
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hexify( output, hash, HASHSIZE ); | ||
notify( "Printing hash output...", MAIN_ID, 0 ); | ||
notify( (char*)output, MAIN_ID, 0 ); | ||
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cleanup: | ||
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if( osOK != ret ) | ||
{ | ||
notify( "RTOS thread operation FAILED", MAIN_ID, ret ); | ||
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for( i = 0; i < 2 * THREADS; i++ ) | ||
thread[i].terminate(); | ||
} | ||
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mbedtls_entropy_free( &entropy ); | ||
mbedtls_threading_free_alt(); | ||
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notify( "Done.", MAIN_ID, 0 ); | ||
} |
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https://github.com/ARMmbed/mbed-os/#e435a07d9252f133ea3d9f6c95dfb176f32ab9b6 |