145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/*
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* Portable interface to the CPU cycle counter
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_TIMING_C)
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#include "mbedtls/timing.h"
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#if !defined(MBEDTLS_TIMING_ALT)
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#if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
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!defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
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!defined(__HAIKU__) && !defined(__midipix__)
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#error "This module only works on Unix and Windows, see MBEDTLS_TIMING_C in config.h"
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#endif
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#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
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#include <windows.h>
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#include <process.h>
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struct _hr_time
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{
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LARGE_INTEGER start;
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};
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#else
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <signal.h>
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#include <time.h>
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struct _hr_time
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{
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struct timeval start;
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};
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#endif /* _WIN32 && !EFIX64 && !EFI32 */
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volatile int mbedtls_timing_alarmed = 0;
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#if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
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unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
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{
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struct _hr_time *t = (struct _hr_time *) val;
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if( reset )
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{
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QueryPerformanceCounter( &t->start );
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return( 0 );
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}
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else
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{
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unsigned long delta;
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LARGE_INTEGER now, hfreq;
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QueryPerformanceCounter( &now );
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QueryPerformanceFrequency( &hfreq );
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delta = (unsigned long)( ( now.QuadPart - t->start.QuadPart ) * 1000ul
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/ hfreq.QuadPart );
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return( delta );
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}
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}
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#else /* _WIN32 && !EFIX64 && !EFI32 */
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unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset )
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{
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struct _hr_time *t = (struct _hr_time *) val;
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if( reset )
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{
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gettimeofday( &t->start, NULL );
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return( 0 );
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}
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else
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{
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unsigned long delta;
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struct timeval now;
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gettimeofday( &now, NULL );
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delta = ( now.tv_sec - t->start.tv_sec ) * 1000ul
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+ ( now.tv_usec - t->start.tv_usec ) / 1000;
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return( delta );
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}
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}
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#endif /* _WIN32 && !EFIX64 && !EFI32 */
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/*
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* Set delays to watch
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*/
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void mbedtls_timing_set_delay( void *data, uint32_t int_ms, uint32_t fin_ms )
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{
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mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
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ctx->int_ms = int_ms;
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ctx->fin_ms = fin_ms;
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if( fin_ms != 0 )
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(void) mbedtls_timing_get_timer( &ctx->timer, 1 );
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}
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/*
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* Get number of delays expired
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*/
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int mbedtls_timing_get_delay( void *data )
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{
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mbedtls_timing_delay_context *ctx = (mbedtls_timing_delay_context *) data;
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unsigned long elapsed_ms;
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if( ctx->fin_ms == 0 )
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return( -1 );
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elapsed_ms = mbedtls_timing_get_timer( &ctx->timer, 0 );
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if( elapsed_ms >= ctx->fin_ms )
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return( 2 );
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if( elapsed_ms >= ctx->int_ms )
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return( 1 );
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return( 0 );
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}
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#endif /* !MBEDTLS_TIMING_ALT */
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#endif /* MBEDTLS_TIMING_C */
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