metime.c
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上传日期:2007-01-12
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- /*
- * metime.c
- *
- * Modular exponentiation timing test
- *
- * $Id: metime.c,v 1.3 2000/09/14 00:31:01 nelsonb%netscape.com Exp $
- *
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (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.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the MPI Arbitrary Precision Integer Arithmetic
- * library.
- *
- * The Initial Developer of the Original Code is Michael J. Fromberger.
- * Portions created by Michael J. Fromberger are
- * Copyright (C) 2000 Michael J. Fromberger. All Rights Reserved.
- *
- * Contributor(s):
- * Netscape Communications Corporation
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the GPL.
- *
- * $Id: metime.c,v 1.3 2000/09/14 00:31:01 nelsonb%netscape.com Exp $
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <limits.h>
- #include <time.h>
- #include "mpi.h"
- #include "mpprime.h"
- double clk_to_sec(clock_t start, clock_t stop);
- int main(int argc, char *argv[])
- {
- int ix, num, prec = 8;
- unsigned int seed;
- clock_t start, stop;
- double sec;
- mp_int a, m, c;
- if(getenv("SEED") != NULL)
- seed = abs(atoi(getenv("SEED")));
- else
- seed = (unsigned int)time(NULL);
- if(argc < 2) {
- fprintf(stderr, "Usage: %s <num-tests> [<nbits>]n", argv[0]);
- return 1;
- }
- if((num = atoi(argv[1])) < 0)
- num = -num;
- if(!num) {
- fprintf(stderr, "%s: must perform at least 1 testn", argv[0]);
- return 1;
- }
- if(argc > 2) {
- if((prec = atoi(argv[2])) <= 0)
- prec = 8;
- else
- prec = (prec + (DIGIT_BIT - 1)) / DIGIT_BIT;
- }
-
- printf("Modular exponentiation timing testn"
- "Precision: %d digits (%d bits)n"
- "# of tests: %dnn", prec, prec * DIGIT_BIT, num);
- mp_init_size(&a, prec);
- mp_init_size(&m, prec);
- mp_init_size(&c, prec);
- srand(seed);
- start = clock();
- for(ix = 0; ix < num; ix++) {
- mpp_random_size(&a, prec);
- mpp_random_size(&c, prec);
- mpp_random_size(&m, prec);
- /* set msb and lsb of m */
- DIGIT(&m,0) |= 1;
- DIGIT(&m, USED(&m)-1) |= (mp_digit)1 << (DIGIT_BIT - 1);
- if (mp_cmp(&a, &m) > 0)
- mp_sub(&a, &m, &a);
- mp_exptmod(&a, &c, &m, &c);
- }
- stop = clock();
- sec = clk_to_sec(start, stop);
- printf("Total: %.3f secondsn", sec);
- printf("Individual: %.3f secondsn", sec / num);
- mp_clear(&c);
- mp_clear(&a);
- mp_clear(&m);
- return 0;
- }
- double clk_to_sec(clock_t start, clock_t stop)
- {
- return (double)(stop - start) / CLOCKS_PER_SEC;
- }
- /*------------------------------------------------------------------------*/
- /* HERE THERE BE DRAGONS */