1 /*
2 * Portable interface to the CPU cycle counter
3 *
4 * SPDX-FileCopyrightText: The Mbed TLS Contributors
5 *
6 * SPDX-License-Identifier: Apache-2.0
7 *
8 * SPDX-FileContributor: 2016-2022 Espressif Systems (Shanghai) CO LTD
9 */
10 /*
11 * mbedtls_timing_get_timer()m mbedtls_timing_set_delay() and
12 * mbedtls_timing_set_delay only abstracted from mbedtls/library/timing.c
13 * as that does not build on ESP-IDF but these 2 functions are needed for
14 * DTLS (in particular mbedtls_ssl_set_timer_cb() must be called for DTLS
15 * which requires these 2 delay functions).
16 */
17
18 #include <mbedtls/build_info.h>
19
20 #if !defined(MBEDTLS_ESP_TIMING_C)
21
22 #include <sys/time.h>
23 #include "mbedtls/timing.h"
24
25 struct _hr_time
26 {
27 struct timeval start;
28 };
29
mbedtls_timing_get_timer(struct mbedtls_timing_hr_time * val,int reset)30 unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
31 {
32 struct _hr_time *t = (struct _hr_time *) val;
33
34 if( reset )
35 {
36 gettimeofday( &t->start, NULL );
37 return( 0 );
38 }
39 else
40 {
41 unsigned long delta;
42 struct timeval now;
43 gettimeofday( &now, NULL );
44 delta = ( now.tv_sec - t->start.tv_sec ) * 1000ul
45 + ( now.tv_usec - t->start.tv_usec ) / 1000;
46 return( delta );
47 }
48 }
49
50 /*
51 * Set delays to watch
52 */
mbedtls_timing_set_delay(void * data,uint32_t int_ms,uint32_t fin_ms)53 void mbedtls_timing_set_delay( void *data, uint32_t int_ms, uint32_t fin_ms )
54 {
55 mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
56
57 ctx->MBEDTLS_PRIVATE(int_ms) = int_ms;
58 ctx->MBEDTLS_PRIVATE(fin_ms) = fin_ms;
59
60 if( fin_ms != 0 )
61 (void) mbedtls_timing_get_timer( &ctx->MBEDTLS_PRIVATE(timer), 1 );
62 }
63
64 /*
65 * Get number of delays expired
66 */
mbedtls_timing_get_delay(void * data)67 int mbedtls_timing_get_delay( void *data )
68 {
69 mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
70 unsigned long elapsed_ms;
71
72 if( ctx->MBEDTLS_PRIVATE(fin_ms) == 0 )
73 return( -1 );
74
75 elapsed_ms = mbedtls_timing_get_timer( &ctx->MBEDTLS_PRIVATE(timer), 0 );
76
77 if( elapsed_ms >= ctx->MBEDTLS_PRIVATE(fin_ms) )
78 return( 2 );
79
80 if( elapsed_ms >= ctx->MBEDTLS_PRIVATE(int_ms) )
81 return( 1 );
82
83 return( 0 );
84 }
85
86 /*
87 * Get the final delay.
88 */
mbedtls_timing_get_final_delay(const mbedtls_timing_delay_context * data)89 uint32_t mbedtls_timing_get_final_delay( const mbedtls_timing_delay_context *data )
90 {
91 return( data->MBEDTLS_PRIVATE(fin_ms) );
92 }
93
94 #endif /* MBEDTLS_ESP_TIMING_C */
95
