RetroZilla/security/nss/lib/freebl/mpi/utils/lap.c
2015-10-20 23:03:22 -04:00

122 lines
3.0 KiB
C

/*
* lap.c
*
* Find least annihilating power of a mod m
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* 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 the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* $Id: lap.c,v 1.4 2004/04/27 23:04:37 gerv%gerv.net Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include "mpi.h"
void sig_catch(int ign);
int g_quit = 0;
int main(int argc, char *argv[])
{
mp_int a, m, p, k;
if(argc < 3) {
fprintf(stderr, "Usage: %s <a> <m>\n", argv[0]);
return 1;
}
mp_init(&a);
mp_init(&m);
mp_init(&p);
mp_add_d(&p, 1, &p);
mp_read_radix(&a, argv[1], 10);
mp_read_radix(&m, argv[2], 10);
mp_init_copy(&k, &a);
signal(SIGINT, sig_catch);
#ifndef __OS2__
signal(SIGHUP, sig_catch);
#endif
signal(SIGTERM, sig_catch);
while(mp_cmp(&p, &m) < 0) {
if(g_quit) {
int len;
char *buf;
len = mp_radix_size(&p, 10);
buf = malloc(len);
mp_toradix(&p, buf, 10);
fprintf(stderr, "Terminated at: %s\n", buf);
free(buf);
return 1;
}
if(mp_cmp_d(&k, 1) == 0) {
int len;
char *buf;
len = mp_radix_size(&p, 10);
buf = malloc(len);
mp_toradix(&p, buf, 10);
printf("%s\n", buf);
free(buf);
break;
}
mp_mulmod(&k, &a, &m, &k);
mp_add_d(&p, 1, &p);
}
if(mp_cmp(&p, &m) >= 0)
printf("No annihilating power.\n");
mp_clear(&p);
mp_clear(&m);
mp_clear(&a);
return 0;
}
void sig_catch(int ign)
{
g_quit = 1;
}