Mercurial > dropbear

annotate libtommath/bn_mp_div_d.c @ 1667:986126448688

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Update remaining advise to edit options.h You should edit localoptions.h instead.
author Alexander Dahl <ada@thorsis.com>
date Tue, 10 Mar 2020 15:38:38 +0100
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 */