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annotate libtommath/bn_mp_div_d.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +0000
parents f52919ffd3b1
children 1051e4eea25a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_DIV_D_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 static int s_is_power_of_two(mp_digit b, int *p)
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16 {
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17 int x;
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18
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19 /* fast return if no power of two */
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20 if ((b == 0u) || ((b & (b-1u)) != 0u)) {
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21 return 0;
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22 }
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23
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24 for (x = 0; x < DIGIT_BIT; x++) {
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25 if (b == ((mp_digit)1<<(mp_digit)x)) {
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26 *p = x;
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27 return 1;
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28 }
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29 }
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30 return 0;
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31 }
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32
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33 /* single digit division (based on routine from MPI) */
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34 int mp_div_d(const mp_int *a, mp_digit b, mp_int *c, mp_digit *d)
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35 {
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36 mp_int q;
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37 mp_word w;
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38 mp_digit t;
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39 int res, ix;
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40
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41 /* cannot divide by zero */
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42 if (b == 0u) {
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43 return MP_VAL;
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44 }
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45
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46 /* quick outs */
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47 if ((b == 1u) || (mp_iszero(a) == MP_YES)) {
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48 if (d != NULL) {
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49 *d = 0;
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50 }
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51 if (c != NULL) {
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52 return mp_copy(a, c);
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53 }
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54 return MP_OKAY;
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55 }
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56
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57 /* power of two ? */
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58 if (s_is_power_of_two(b, &ix) == 1) {
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59 if (d != NULL) {
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60 *d = a->dp[0] & (((mp_digit)1<<(mp_digit)ix) - 1uL);
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61 }
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62 if (c != NULL) {
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63 return mp_div_2d(a, ix, c, NULL);
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64 }
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65 return MP_OKAY;
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66 }
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67
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68 #ifdef BN_MP_DIV_3_C
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69 /* three? */
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70 if (b == 3u) {
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71 return mp_div_3(a, c, d);
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72 }
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73 #endif
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74
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75 /* no easy answer [c'est la vie]. Just division */
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76 if ((res = mp_init_size(&q, a->used)) != MP_OKAY) {
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77 return res;
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78 }
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79
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80 q.used = a->used;
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81 q.sign = a->sign;
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82 w = 0;
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83 for (ix = a->used - 1; ix >= 0; ix--) {
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84 w = (w << (mp_word)DIGIT_BIT) | (mp_word)a->dp[ix];
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85
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86 if (w >= b) {
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87 t = (mp_digit)(w / b);
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88 w -= (mp_word)t * (mp_word)b;
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89 } else {
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90 t = 0;
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91 }
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92 q.dp[ix] = t;
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93 }
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94
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95 if (d != NULL) {
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96 *d = (mp_digit)w;
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97 }
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98
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99 if (c != NULL) {
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100 mp_clamp(&q);
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101 mp_exch(&q, c);
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102 }
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103 mp_clear(&q);
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104
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105 return res;
284
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106 }
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107
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108 #endif
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109
1655
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110 /* ref: HEAD -> master, tag: v1.1.0 */
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111 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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112 /* commit time: 2019-01-28 20:32:32 +0100 */