/security/nss/lib/freebl/mpi/utils/invmod.c
http://github.com/zpao/v8monkey · C · 92 lines · 39 code · 12 blank · 41 comment · 3 complexity · 9fe97199def669151e9b6a355f38d25d MD5 · raw file
- /*
- * invmod.c
- *
- * Compute modular inverses
- *
- * ***** 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) 1997
- * 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: invmod.c,v 1.3 2004/04/27 23:04:37 gerv%gerv.net Exp $ */
- #include <stdio.h>
- #include <stdlib.h>
- #include "mpi.h"
- int main(int argc, char *argv[])
- {
- mp_int a, m;
- mp_err res;
- char *buf;
- int len, out = 0;
- if(argc < 3) {
- fprintf(stderr, "Usage: %s <a> <m>\n", argv[0]);
- return 1;
- }
- mp_init(&a); mp_init(&m);
- mp_read_radix(&a, argv[1], 10);
- mp_read_radix(&m, argv[2], 10);
- if(mp_cmp(&a, &m) > 0)
- mp_mod(&a, &m, &a);
- switch((res = mp_invmod(&a, &m, &a))) {
- case MP_OKAY:
- len = mp_radix_size(&a, 10);
- buf = malloc(len);
- mp_toradix(&a, buf, 10);
- printf("%s\n", buf);
- free(buf);
- break;
- case MP_UNDEF:
- printf("No inverse\n");
- out = 1;
- break;
- default:
- printf("error: %s (%d)\n", mp_strerror(res), res);
- out = 2;
- break;
- }
- mp_clear(&a);
- mp_clear(&m);
- return out;
- }