35 lines
1.6 KiB
C
35 lines
1.6 KiB
C
/* Copyright (c) (2014,2015,2016,2018,2019) Apple Inc. All rights reserved.
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*
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* corecrypto is licensed under Apple Inc.’s Internal Use License Agreement (which
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* is contained in the License.txt file distributed with corecrypto) and only to
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* people who accept that license. IMPORTANT: Any license rights granted to you by
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* Apple Inc. (if any) are limited to internal use within your organization only on
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* devices and computers you own or control, for the sole purpose of verifying the
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* security characteristics and correct functioning of the Apple Software. You may
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* not, directly or indirectly, redistribute the Apple Software or any portions thereof.
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*/
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#ifndef __corecrypto__cc_constanttime__
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#define __corecrypto__cc_constanttime__
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#include <corecrypto/cc_absolute_time.h>
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int compare_timing(const void *a, const void *b);
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#define TIMING_WITH_QUANTILE(_R, _repeat_number, _quantile, _function, errOut) { \
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uint64_t _timing_sample[_repeat_number]; \
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/* Get <repeat_number> timing samples */ \
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for (size_t l=0;l<(_repeat_number);l++) { \
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perf_cycle_start(errOut); \
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_function; \
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_timing_sample[l]=perf_cycle(errOut); \
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/* Discard measurement if 0 */ \
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if (_timing_sample[l]==0) l--; \
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} \
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/* Sort the samples */ \
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qsort(_timing_sample, _repeat_number, sizeof(_timing_sample[0]), compare_timing); \
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/* Return quantile */ \
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_R = (_timing_sample[((_repeat_number)*(_quantile))/100]); \
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}
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#endif /* defined(__corecrypto__cc_constanttime__) */
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