esp-idf/components/mbedtls/port/esp_timing.c

95 lines
2.3 KiB
C

/*
* Portable interface to the CPU cycle counter
*
* SPDX-FileCopyrightText: The Mbed TLS Contributors
*
* SPDX-License-Identifier: Apache-2.0
*
* SPDX-FileContributor: 2016-2022 Espressif Systems (Shanghai) CO LTD
*/
/*
* mbedtls_timing_get_timer()m mbedtls_timing_set_delay() and
* mbedtls_timing_set_delay only abstracted from mbedtls/library/timing.c
* as that does not build on ESP-IDF but these 2 functions are needed for
* DTLS (in particular mbedtls_ssl_set_timer_cb() must be called for DTLS
* which requires these 2 delay functions).
*/
#include <mbedtls/build_info.h>
#if !defined(MBEDTLS_ESP_TIMING_C)
#include <sys/time.h>
#include "mbedtls/timing.h"
struct _hr_time
{
struct timeval start;
};
unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
{
struct _hr_time *t = (struct _hr_time *) val;
if( reset )
{
gettimeofday( &t->start, NULL );
return( 0 );
}
else
{
unsigned long delta;
struct timeval now;
gettimeofday( &now, NULL );
delta = ( now.tv_sec - t->start.tv_sec ) * 1000ul
+ ( now.tv_usec - t->start.tv_usec ) / 1000;
return( delta );
}
}
/*
* Set delays to watch
*/
void mbedtls_timing_set_delay( void *data, uint32_t int_ms, uint32_t fin_ms )
{
mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
ctx->MBEDTLS_PRIVATE(int_ms) = int_ms;
ctx->MBEDTLS_PRIVATE(fin_ms) = fin_ms;
if( fin_ms != 0 )
(void) mbedtls_timing_get_timer( &ctx->MBEDTLS_PRIVATE(timer), 1 );
}
/*
* Get number of delays expired
*/
int mbedtls_timing_get_delay( void *data )
{
mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
unsigned long elapsed_ms;
if( ctx->MBEDTLS_PRIVATE(fin_ms) == 0 )
return( -1 );
elapsed_ms = mbedtls_timing_get_timer( &ctx->MBEDTLS_PRIVATE(timer), 0 );
if( elapsed_ms >= ctx->MBEDTLS_PRIVATE(fin_ms) )
return( 2 );
if( elapsed_ms >= ctx->MBEDTLS_PRIVATE(int_ms) )
return( 1 );
return( 0 );
}
/*
* Get the final delay.
*/
uint32_t mbedtls_timing_get_final_delay( const mbedtls_timing_delay_context *data )
{
return( data->MBEDTLS_PRIVATE(fin_ms) );
}
#endif /* MBEDTLS_ESP_TIMING_C */