Mercurial > dropbear
annotate libtommath/bn_mp_add_d.c @ 1684:d5d25ce2a2ed
cast to fix warning
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 26 May 2020 19:57:28 +0800 |
parents | f52919ffd3b1 |
children | 1051e4eea25a |
rev | line source |
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_ADD_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 /* single digit addition */ |
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16 int mp_add_d(const mp_int *a, mp_digit b, mp_int *c) |
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17 { |
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18 int res, ix, oldused; |
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19 mp_digit *tmpa, *tmpc, mu; |
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20 |
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21 /* grow c as required */ |
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22 if (c->alloc < (a->used + 1)) { |
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23 if ((res = mp_grow(c, a->used + 1)) != MP_OKAY) { |
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24 return res; |
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25 } |
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26 } |
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27 |
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28 /* if a is negative and |a| >= b, call c = |a| - b */ |
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29 if ((a->sign == MP_NEG) && ((a->used > 1) || (a->dp[0] >= b))) { |
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30 mp_int a_ = *a; |
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31 /* temporarily fix sign of a */ |
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32 a_.sign = MP_ZPOS; |
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33 |
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34 /* c = |a| - b */ |
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35 res = mp_sub_d(&a_, b, c); |
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36 |
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37 /* fix sign */ |
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38 c->sign = MP_NEG; |
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39 |
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40 /* clamp */ |
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41 mp_clamp(c); |
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42 |
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43 return res; |
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44 } |
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45 |
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46 /* old number of used digits in c */ |
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47 oldused = c->used; |
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48 |
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49 /* source alias */ |
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50 tmpa = a->dp; |
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51 |
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52 /* destination alias */ |
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53 tmpc = c->dp; |
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54 |
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55 /* if a is positive */ |
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56 if (a->sign == MP_ZPOS) { |
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57 /* add digit, after this we're propagating |
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58 * the carry. |
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59 */ |
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60 *tmpc = *tmpa++ + b; |
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61 mu = *tmpc >> DIGIT_BIT; |
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62 *tmpc++ &= MP_MASK; |
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63 |
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64 /* now handle rest of the digits */ |
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65 for (ix = 1; ix < a->used; ix++) { |
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66 *tmpc = *tmpa++ + mu; |
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67 mu = *tmpc >> DIGIT_BIT; |
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68 *tmpc++ &= MP_MASK; |
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69 } |
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70 /* set final carry */ |
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71 ix++; |
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72 *tmpc++ = mu; |
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73 |
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74 /* setup size */ |
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75 c->used = a->used + 1; |
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76 } else { |
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77 /* a was negative and |a| < b */ |
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78 c->used = 1; |
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79 |
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80 /* the result is a single digit */ |
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81 if (a->used == 1) { |
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82 *tmpc++ = b - a->dp[0]; |
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83 } else { |
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84 *tmpc++ = b; |
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85 } |
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86 |
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87 /* setup count so the clearing of oldused |
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88 * can fall through correctly |
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89 */ |
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90 ix = 1; |
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91 } |
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92 |
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93 /* sign always positive */ |
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94 c->sign = MP_ZPOS; |
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95 |
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96 /* now zero to oldused */ |
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97 while (ix++ < oldused) { |
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98 *tmpc++ = 0; |
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99 } |
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100 mp_clamp(c); |
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101 |
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102 return MP_OKAY; |
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103 } |
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104 |
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105 #endif |
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106 |
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107 /* ref: HEAD -> master, tag: v1.1.0 */ |
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108 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
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109 /* commit time: 2019-01-28 20:32:32 +0100 */ |