annotate libtommath/bn_mp_add_d.c @ 1216:3daff2072bd0

rename killchild to kill_proxy_sighandler
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Dec 2015 22:15:44 +0800 (2015-12-15)
parents 5ff8218bcee9
children 60fc6476e044
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1 #include <tommath.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 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
389
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15 * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
284
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16 */
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17
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18 /* single digit addition */
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19 int
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20 mp_add_d (mp_int * a, mp_digit b, mp_int * c)
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21 {
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22 int res, ix, oldused;
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23 mp_digit *tmpa, *tmpc, mu;
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24
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25 /* grow c as required */
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26 if (c->alloc < a->used + 1) {
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27 if ((res = mp_grow(c, a->used + 1)) != MP_OKAY) {
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28 return res;
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29 }
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30 }
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31
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32 /* if a is negative and |a| >= b, call c = |a| - b */
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33 if (a->sign == MP_NEG && (a->used > 1 || a->dp[0] >= b)) {
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34 /* temporarily fix sign of a */
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35 a->sign = MP_ZPOS;
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36
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37 /* c = |a| - b */
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38 res = mp_sub_d(a, b, c);
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39
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40 /* fix sign */
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41 a->sign = c->sign = MP_NEG;
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42
389
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43 /* clamp */
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44 mp_clamp(c);
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45
284
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46 return res;
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47 }
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48
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49 /* old number of used digits in c */
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50 oldused = c->used;
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51
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52 /* sign always positive */
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53 c->sign = MP_ZPOS;
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54
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55 /* source alias */
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56 tmpa = a->dp;
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57
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58 /* destination alias */
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59 tmpc = c->dp;
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60
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61 /* if a is positive */
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62 if (a->sign == MP_ZPOS) {
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63 /* add digit, after this we're propagating
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64 * the carry.
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65 */
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66 *tmpc = *tmpa++ + b;
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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 /* now handle rest of the digits */
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71 for (ix = 1; ix < a->used; ix++) {
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72 *tmpc = *tmpa++ + mu;
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73 mu = *tmpc >> DIGIT_BIT;
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74 *tmpc++ &= MP_MASK;
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75 }
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76 /* set final carry */
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77 ix++;
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78 *tmpc++ = mu;
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79
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80 /* setup size */
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81 c->used = a->used + 1;
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82 } else {
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Matt Johnston <matt@ucc.asn.au>
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83 /* a was negative and |a| < b */
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84 c->used = 1;
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85
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86 /* the result is a single digit */
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Matt Johnston <matt@ucc.asn.au>
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87 if (a->used == 1) {
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Matt Johnston <matt@ucc.asn.au>
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88 *tmpc++ = b - a->dp[0];
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89 } else {
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90 *tmpc++ = b;
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91 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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92
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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93 /* setup count so the clearing of oldused
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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94 * can fall through correctly
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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95 */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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96 ix = 1;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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97 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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98
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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99 /* now zero to oldused */
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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100 while (ix++ < oldused) {
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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101 *tmpc++ = 0;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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102 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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103 mp_clamp(c);
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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104
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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105 return MP_OKAY;
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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106 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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107
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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108 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
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109
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
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110 /* $Source: /cvs/libtom/libtommath/bn_mp_add_d.c,v $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
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111 /* $Revision: 1.4 $ */
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
Matt Johnston <matt@ucc.asn.au>
parents: 284
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112 /* $Date: 2006/03/31 14:18:44 $ */