mptest-4b.c
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上传日期:2007-01-12
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文件大小:3k
- /*
- * mptest-4b.c
- *
- * Test speed of a large modular exponentiation of a primitive element
- * modulo a prime.
- *
- * 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) 1998, 1999, 2000 Michael J. Fromberger.
- * All Rights Reserved.
- *
- * Contributor(s):
- *
- * 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: mptest-4b.c,v 1.1 2000/07/14 00:44:44 nelsonb%netscape.com Exp $
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <limits.h>
- #include <time.h>
- #include <sys/time.h>
- #include "mpi.h"
- #include "mpprime.h"
- char *g_prime =
- "34BD53C07350E817CCD49721020F1754527959C421C1533244769D4CF060A8B1C3DA"
- "25094BE723FB1E2369B55FEEBBE0FAC16425161BF82684062B5EC5D7D47D1B23C117"
- "0FA19745E44A55E148314E582EB813AC9EE5126295E2E380CACC2F6D206B293E5ED9"
- "23B54EE961A8C69CD625CE4EC38B70C649D7F014432AEF3A1C93";
- char *g_gen = "5";
- typedef struct {
- unsigned int sec;
- unsigned int usec;
- } instant_t;
- instant_t now(void)
- {
- struct timeval clk;
- instant_t res;
- res.sec = res.usec = 0;
- if(gettimeofday(&clk, NULL) != 0)
- return res;
- res.sec = clk.tv_sec;
- res.usec = clk.tv_usec;
- return res;
- }
- extern mp_err s_mp_pad();
- int main(int argc, char *argv[])
- {
- instant_t start, finish;
- mp_int prime, gen, expt, res;
- unsigned int ix, diff;
- int num;
- srand(time(NULL));
- if(argc < 2) {
- fprintf(stderr, "Usage: %s <num-tests>n", argv[0]);
- return 1;
- }
- if((num = atoi(argv[1])) < 0)
- num = -num;
- if(num == 0)
- ++num;
- mp_init(&prime); mp_init(&gen); mp_init(&res);
- mp_read_radix(&prime, g_prime, 16);
- mp_read_radix(&gen, g_gen, 16);
- mp_init_size(&expt, USED(&prime) - 1);
- s_mp_pad(&expt, USED(&prime) - 1);
- printf("Testing %d modular exponentations ... n", num);
- start = now();
- for(ix = 0; ix < num; ix++) {
- mpp_random(&expt);
- mp_exptmod(&gen, &expt, &prime, &res);
- }
- finish = now();
- diff = (finish.sec - start.sec) * 1000000;
- diff += finish.usec; diff -= start.usec;
- printf("%d operations took %u usec (%.3f sec)n",
- num, diff, (double)diff / 1000000.0);
- printf("That is %.3f sec per operation.n",
- ((double)diff / 1000000.0) / num);
- mp_clear(&expt);
- mp_clear(&res);
- mp_clear(&gen);
- mp_clear(&prime);
- return 0;
- }