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annotate libtommath/bn_mp_tc_xor.c @ 1684:d5d25ce2a2ed

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cast to fix warning
author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 19:57:28 +0800
parents f52919ffd3b1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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diff changeset
1 #include "tommath_private.h"
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2 #ifdef BN_MP_TC_XOR_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* two complement xor */
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16 int mp_tc_xor(const mp_int *a, const mp_int *b, mp_int *c)
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17 {
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18 int res = MP_OKAY, bits, abits, bbits;
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19 int as = mp_isneg(a), bs = mp_isneg(b);
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20 mp_int *mx = NULL, _mx, acpy, bcpy;
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21
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22 if ((as != MP_NO) || (bs != MP_NO)) {
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23 abits = mp_count_bits(a);
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24 bbits = mp_count_bits(b);
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25 bits = MAX(abits, bbits);
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26 res = mp_init_set_int(&_mx, 1uL);
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27 if (res != MP_OKAY) {
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28 goto end;
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29 }
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30
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31 mx = &_mx;
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32 res = mp_mul_2d(mx, bits + 1, mx);
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33 if (res != MP_OKAY) {
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34 goto end;
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35 }
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36
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37 if (as != MP_NO) {
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38 res = mp_init(&acpy);
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39 if (res != MP_OKAY) {
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40 goto end;
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41 }
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42
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43 res = mp_add(mx, a, &acpy);
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44 if (res != MP_OKAY) {
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45 mp_clear(&acpy);
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46 goto end;
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47 }
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48 a = &acpy;
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49 }
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50 if (bs != MP_NO) {
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51 res = mp_init(&bcpy);
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52 if (res != MP_OKAY) {
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53 goto end;
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54 }
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55
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56 res = mp_add(mx, b, &bcpy);
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57 if (res != MP_OKAY) {
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58 mp_clear(&bcpy);
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59 goto end;
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60 }
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61 b = &bcpy;
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62 }
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63 }
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64
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65 res = mp_xor(a, b, c);
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66
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67 if ((as != bs) && (res == MP_OKAY)) {
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68 res = mp_sub(c, mx, c);
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69 }
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70
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71 end:
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72 if (a == &acpy) {
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73 mp_clear(&acpy);
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74 }
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75
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76 if (b == &bcpy) {
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77 mp_clear(&bcpy);
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78 }
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79
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80 if (mx == &_mx) {
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81 mp_clear(mx);
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82 }
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83
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84 return res;
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85 }
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86 #endif
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87
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88 /* ref: HEAD -> master, tag: v1.1.0 */
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89 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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90 /* commit time: 2019-01-28 20:32:32 +0100 */