Mercurial > dropbear
annotate libtommath/bn_s_mp_add.c @ 447:278805938dcf
Patch from Nicolai Ehemann to try binding before going to the background,
so that if it exits early (because something's already listening etc)
then it will return an exitcode of 1.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 19 Jul 2007 15:54:18 +0000 |
parents | 5ff8218bcee9 |
children | 60fc6476e044 |
rev | line source |
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284
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1 #include <tommath.h> |
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2 #ifdef BN_S_MP_ADD_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, [email protected], http://math.libtomcrypt.com |
284
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16 */ |
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17 |
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18 /* low level addition, based on HAC pp.594, Algorithm 14.7 */ |
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19 int |
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20 s_mp_add (mp_int * a, mp_int * b, mp_int * c) |
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21 { |
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22 mp_int *x; |
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23 int olduse, res, min, max; |
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24 |
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25 /* find sizes, we let |a| <= |b| which means we have to sort |
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26 * them. "x" will point to the input with the most digits |
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27 */ |
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28 if (a->used > b->used) { |
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29 min = b->used; |
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30 max = a->used; |
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31 x = a; |
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32 } else { |
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33 min = a->used; |
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34 max = b->used; |
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35 x = b; |
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36 } |
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37 |
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38 /* init result */ |
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39 if (c->alloc < max + 1) { |
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40 if ((res = mp_grow (c, max + 1)) != MP_OKAY) { |
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41 return res; |
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42 } |
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43 } |
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44 |
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45 /* get old used digit count and set new one */ |
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46 olduse = c->used; |
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47 c->used = max + 1; |
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48 |
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49 { |
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50 register mp_digit u, *tmpa, *tmpb, *tmpc; |
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51 register int i; |
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52 |
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53 /* alias for digit pointers */ |
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54 |
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55 /* first input */ |
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56 tmpa = a->dp; |
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57 |
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58 /* second input */ |
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59 tmpb = b->dp; |
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60 |
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61 /* destination */ |
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62 tmpc = c->dp; |
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63 |
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64 /* zero the carry */ |
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65 u = 0; |
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66 for (i = 0; i < min; i++) { |
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67 /* Compute the sum at one digit, T[i] = A[i] + B[i] + U */ |
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68 *tmpc = *tmpa++ + *tmpb++ + u; |
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69 |
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70 /* U = carry bit of T[i] */ |
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71 u = *tmpc >> ((mp_digit)DIGIT_BIT); |
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72 |
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73 /* take away carry bit from T[i] */ |
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74 *tmpc++ &= MP_MASK; |
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75 } |
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76 |
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77 /* now copy higher words if any, that is in A+B |
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78 * if A or B has more digits add those in |
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79 */ |
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80 if (min != max) { |
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81 for (; i < max; i++) { |
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82 /* T[i] = X[i] + U */ |
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83 *tmpc = x->dp[i] + u; |
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84 |
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85 /* U = carry bit of T[i] */ |
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86 u = *tmpc >> ((mp_digit)DIGIT_BIT); |
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87 |
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88 /* take away carry bit from T[i] */ |
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89 *tmpc++ &= MP_MASK; |
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90 } |
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91 } |
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92 |
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93 /* add carry */ |
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94 *tmpc++ = u; |
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95 |
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96 /* clear digits above oldused */ |
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97 for (i = c->used; i < olduse; i++) { |
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98 *tmpc++ = 0; |
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99 } |
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100 } |
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101 |
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102 mp_clamp (c); |
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103 return MP_OKAY; |
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104 } |
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105 #endif |
389
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106 |
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107 /* $Source: /cvs/libtom/libtommath/bn_s_mp_add.c,v $ */ |
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108 /* $Revision: 1.3 $ */ |
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109 /* $Date: 2006/03/31 14:18:44 $ */ |