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security/nss/lib/freebl/mpi/utils/metime.c@b8a032363ba2 (annotated)

security/nss/lib/freebl/mpi/utils/metime.c

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

michael@0	1	/*
michael@0	2	* metime.c
michael@0	3	*
michael@0	4	* Modular exponentiation timing test
michael@0	5	*
michael@0	6	* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	7	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	8	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	9
michael@0	10	#include <stdio.h>
michael@0	11	#include <stdlib.h>
michael@0	12	#include <string.h>
michael@0	13	#include <limits.h>
michael@0	14	#include <time.h>
michael@0	15
michael@0	16	#include "mpi.h"
michael@0	17	#include "mpprime.h"
michael@0	18
michael@0	19	double clk_to_sec(clock_t start, clock_t stop);
michael@0	20
michael@0	21	int main(int argc, char *argv[])
michael@0	22	{
michael@0	23	int ix, num, prec = 8;
michael@0	24	unsigned int seed;
michael@0	25	clock_t start, stop;
michael@0	26	double sec;
michael@0	27
michael@0	28	mp_int a, m, c;
michael@0	29
michael@0	30	if(getenv("SEED") != NULL)
michael@0	31	seed = abs(atoi(getenv("SEED")));
michael@0	32	else
michael@0	33	seed = (unsigned int)time(NULL);
michael@0	34
michael@0	35	if(argc < 2) {
michael@0	36	fprintf(stderr, "Usage: %s <num-tests> [<nbits>]\n", argv[0]);
michael@0	37	return 1;
michael@0	38	}
michael@0	39
michael@0	40	if((num = atoi(argv[1])) < 0)
michael@0	41	num = -num;
michael@0	42
michael@0	43	if(!num) {
michael@0	44	fprintf(stderr, "%s: must perform at least 1 test\n", argv[0]);
michael@0	45	return 1;
michael@0	46	}
michael@0	47
michael@0	48	if(argc > 2) {
michael@0	49	if((prec = atoi(argv[2])) <= 0)
michael@0	50	prec = 8;
michael@0	51	else
michael@0	52	prec = (prec + (DIGIT_BIT - 1)) / DIGIT_BIT;
michael@0	53
michael@0	54	}
michael@0	55
michael@0	56	printf("Modular exponentiation timing test\n"
michael@0	57	"Precision: %d digits (%d bits)\n"
michael@0	58	"# of tests: %d\n\n", prec, prec * DIGIT_BIT, num);
michael@0	59
michael@0	60	mp_init_size(&a, prec);
michael@0	61	mp_init_size(&m, prec);
michael@0	62	mp_init_size(&c, prec);
michael@0	63
michael@0	64	srand(seed);
michael@0	65
michael@0	66	start = clock();
michael@0	67	for(ix = 0; ix < num; ix++) {
michael@0	68
michael@0	69	mpp_random_size(&a, prec);
michael@0	70	mpp_random_size(&c, prec);
michael@0	71	mpp_random_size(&m, prec);
michael@0	72	/* set msb and lsb of m */
michael@0	73	DIGIT(&m,0) |= 1;
michael@0	74	DIGIT(&m, USED(&m)-1) |= (mp_digit)1 << (DIGIT_BIT - 1);
michael@0	75	if (mp_cmp(&a, &m) > 0)
michael@0	76	mp_sub(&a, &m, &a);
michael@0	77
michael@0	78	mp_exptmod(&a, &c, &m, &c);
michael@0	79	}
michael@0	80	stop = clock();
michael@0	81
michael@0	82	sec = clk_to_sec(start, stop);
michael@0	83
michael@0	84	printf("Total: %.3f seconds\n", sec);
michael@0	85	printf("Individual: %.3f seconds\n", sec / num);
michael@0	86
michael@0	87	mp_clear(&c);
michael@0	88	mp_clear(&a);
michael@0	89	mp_clear(&m);
michael@0	90
michael@0	91	return 0;
michael@0	92	}
michael@0	93
michael@0	94	double clk_to_sec(clock_t start, clock_t stop)
michael@0	95	{
michael@0	96	return (double)(stop - start) / CLOCKS_PER_SEC;
michael@0	97	}
michael@0	98
michael@0	99	/*------------------------------------------------------------------------*/
michael@0	100	/* HERE THERE BE DRAGONS */