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comparison: security/nss/lib/freebl/mpi/utils/invmod.c
security/nss/lib/freebl/mpi/utils/invmod.c
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| -1:000000000000 | 0:0d58354231bb |
|---|---|
| 1 /* | |
| 2 * invmod.c | |
| 3 * | |
| 4 * Compute modular inverses | |
| 5 * | |
| 6 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 7 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 8 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 9 | |
| 10 #include <stdio.h> | |
| 11 #include <stdlib.h> | |
| 12 | |
| 13 #include "mpi.h" | |
| 14 | |
| 15 int main(int argc, char *argv[]) | |
| 16 { | |
| 17 mp_int a, m; | |
| 18 mp_err res; | |
| 19 char *buf; | |
| 20 int len, out = 0; | |
| 21 | |
| 22 if(argc < 3) { | |
| 23 fprintf(stderr, "Usage: %s <a> <m>\n", argv[0]); | |
| 24 return 1; | |
| 25 } | |
| 26 | |
| 27 mp_init(&a); mp_init(&m); | |
| 28 mp_read_radix(&a, argv[1], 10); | |
| 29 mp_read_radix(&m, argv[2], 10); | |
| 30 | |
| 31 if(mp_cmp(&a, &m) > 0) | |
| 32 mp_mod(&a, &m, &a); | |
| 33 | |
| 34 switch((res = mp_invmod(&a, &m, &a))) { | |
| 35 case MP_OKAY: | |
| 36 len = mp_radix_size(&a, 10); | |
| 37 buf = malloc(len); | |
| 38 | |
| 39 mp_toradix(&a, buf, 10); | |
| 40 printf("%s\n", buf); | |
| 41 free(buf); | |
| 42 break; | |
| 43 | |
| 44 case MP_UNDEF: | |
| 45 printf("No inverse\n"); | |
| 46 out = 1; | |
| 47 break; | |
| 48 | |
| 49 default: | |
| 50 printf("error: %s (%d)\n", mp_strerror(res), res); | |
| 51 out = 2; | |
| 52 break; | |
| 53 } | |
| 54 | |
| 55 mp_clear(&a); | |
| 56 mp_clear(&m); | |
| 57 | |
| 58 return out; | |
| 59 } |
