diff options
Diffstat (limited to 'mozilla/security/nss/lib/freebl/mpi/utils/invmod.c')
-rw-r--r-- | mozilla/security/nss/lib/freebl/mpi/utils/invmod.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/mozilla/security/nss/lib/freebl/mpi/utils/invmod.c b/mozilla/security/nss/lib/freebl/mpi/utils/invmod.c new file mode 100644 index 0000000..60d6595 --- /dev/null +++ b/mozilla/security/nss/lib/freebl/mpi/utils/invmod.c @@ -0,0 +1,92 @@ +/* + * 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; +} |