Mercurial > dropbear
annotate libtommath/bn_mp_add_d.c @ 1665:7c17995bcdfb
Improve address logging on early exit messages (#83)
Change 'Early exit' and 'Exit before auth' messages to include the IP
address & port as part of the message.
This allows log scanning utilities such as 'fail2ban' to obtain the
offending IP address as part of the failure event instead of extracting
the PID from the message and then scanning the log again for match
'child connection from' messages
Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author | Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com> |
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date | Wed, 18 Mar 2020 15:28:56 +0000 |
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 */ |