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/**
* \file timing.h
*
* \brief Portable interface to timeouts and to the CPU cycle counter
*/
/*
* Copyright The Mbed TLS Contributors
* 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.
*/
#ifndef MBEDTLS_TIMING_H
#define MBEDTLS_TIMING_H
#include "mbedtls/private_access.h"
#include "mbedtls/build_info.h"
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#if !defined(MBEDTLS_TIMING_ALT)
// Regular implementation
//
/**
* \brief timer structure
*/
struct mbedtls_timing_hr_time
{
unsigned char MBEDTLS_PRIVATE(opaque)[32];
};
/**
* \brief Context for mbedtls_timing_set/get_delay()
*/
typedef struct mbedtls_timing_delay_context
{
struct mbedtls_timing_hr_time MBEDTLS_PRIVATE(timer);
uint32_t MBEDTLS_PRIVATE(int_ms);
uint32_t MBEDTLS_PRIVATE(fin_ms);
} mbedtls_timing_delay_context;
#else /* MBEDTLS_TIMING_ALT */
#include "timing_alt.h"
#endif /* MBEDTLS_TIMING_ALT */
/* Internal use */
unsigned long mbedtls_timing_get_timer( struct mbedtls_timing_hr_time *val, int reset );
/**
* \brief Set a pair of delays to watch
* (See \c mbedtls_timing_get_delay().)
*
* \param data Pointer to timing data.
* Must point to a valid \c mbedtls_timing_delay_context struct.
* \param int_ms First (intermediate) delay in milliseconds.
* The effect if int_ms > fin_ms is unspecified.
* \param fin_ms Second (final) delay in milliseconds.
* Pass 0 to cancel the current delay.
*
* \note To set a single delay, either use \c mbedtls_timing_set_timer
* directly or use this function with int_ms == fin_ms.
*/
void mbedtls_timing_set_delay( void *data, uint32_t int_ms, uint32_t fin_ms );
/**
* \brief Get the status of delays
* (Memory helper: number of delays passed.)
*
* \param data Pointer to timing data
* Must point to a valid \c mbedtls_timing_delay_context struct.
*
* \return -1 if cancelled (fin_ms = 0),
* 0 if none of the delays are passed,
* 1 if only the intermediate delay is passed,
* 2 if the final delay is passed.
*/
int mbedtls_timing_get_delay( void *data );
/**
* \brief Get the final timing delay
*
* \param data Pointer to timing data
* Must point to a valid \c mbedtls_timing_delay_context struct.
*
* \return Final timing delay in milliseconds.
*/
uint32_t mbedtls_timing_get_final_delay(
const mbedtls_timing_delay_context *data );
#ifdef __cplusplus
}
#endif
#endif /* timing.h */
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