security/nss/lib/freebl/mpi/utils/invmod.c@6474c204b198 (annotated)
security/nss/lib/freebl/mpi/utils/invmod.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * invmod.c |
| michael@0 | 3 | * |
| michael@0 | 4 | * Compute modular inverses |
| michael@0 | 5 | * |
| michael@0 | 6 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 7 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 8 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 9 | |
| michael@0 | 10 | #include <stdio.h> |
| michael@0 | 11 | #include <stdlib.h> |
| michael@0 | 12 | |
| michael@0 | 13 | #include "mpi.h" |
| michael@0 | 14 | |
| michael@0 | 15 | int main(int argc, char *argv[]) |
| michael@0 | 16 | { |
| michael@0 | 17 | mp_int a, m; |
| michael@0 | 18 | mp_err res; |
| michael@0 | 19 | char *buf; |
| michael@0 | 20 | int len, out = 0; |
| michael@0 | 21 | |
| michael@0 | 22 | if(argc < 3) { |
| michael@0 | 23 | fprintf(stderr, "Usage: %s <a> <m>\n", argv[0]); |
| michael@0 | 24 | return 1; |
| michael@0 | 25 | } |
| michael@0 | 26 | |
| michael@0 | 27 | mp_init(&a); mp_init(&m); |
| michael@0 | 28 | mp_read_radix(&a, argv[1], 10); |
| michael@0 | 29 | mp_read_radix(&m, argv[2], 10); |
| michael@0 | 30 | |
| michael@0 | 31 | if(mp_cmp(&a, &m) > 0) |
| michael@0 | 32 | mp_mod(&a, &m, &a); |
| michael@0 | 33 | |
| michael@0 | 34 | switch((res = mp_invmod(&a, &m, &a))) { |
| michael@0 | 35 | case MP_OKAY: |
| michael@0 | 36 | len = mp_radix_size(&a, 10); |
| michael@0 | 37 | buf = malloc(len); |
| michael@0 | 38 | |
| michael@0 | 39 | mp_toradix(&a, buf, 10); |
| michael@0 | 40 | printf("%s\n", buf); |
| michael@0 | 41 | free(buf); |
| michael@0 | 42 | break; |
| michael@0 | 43 | |
| michael@0 | 44 | case MP_UNDEF: |
| michael@0 | 45 | printf("No inverse\n"); |
| michael@0 | 46 | out = 1; |
| michael@0 | 47 | break; |
| michael@0 | 48 | |
| michael@0 | 49 | default: |
| michael@0 | 50 | printf("error: %s (%d)\n", mp_strerror(res), res); |
| michael@0 | 51 | out = 2; |
| michael@0 | 52 | break; |
| michael@0 | 53 | } |
| michael@0 | 54 | |
| michael@0 | 55 | mp_clear(&a); |
| michael@0 | 56 | mp_clear(&m); |
| michael@0 | 57 | |
| michael@0 | 58 | return out; |
| michael@0 | 59 | } |
