Mercurial > dropbear
annotate libtommath/bn_s_mp_sub.c @ 1681:435cfb9ec96e
send and handle SSH_MSG_EXT_INFO only at the correct point
- other fixes for rsa pubkey auth
- only include ext-info handling when rsa pubkey auth is compiled
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 24 May 2020 14:16:58 +0800 |
parents | f52919ffd3b1 |
children | 1051e4eea25a |
rev | line source |
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1 #include "tommath_private.h" |
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2 #ifdef BN_S_MP_SUB_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 /* low level subtraction (assumes |a| > |b|), HAC pp.595 Algorithm 14.9 */ |
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16 int s_mp_sub(const mp_int *a, const mp_int *b, mp_int *c) |
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17 { |
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18 int olduse, res, min, max; |
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19 |
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20 /* find sizes */ |
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21 min = b->used; |
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22 max = a->used; |
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23 |
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24 /* init result */ |
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25 if (c->alloc < max) { |
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26 if ((res = mp_grow(c, max)) != MP_OKAY) { |
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27 return res; |
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28 } |
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29 } |
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30 olduse = c->used; |
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31 c->used = max; |
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32 |
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33 { |
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34 mp_digit u, *tmpa, *tmpb, *tmpc; |
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35 int i; |
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36 |
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37 /* alias for digit pointers */ |
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38 tmpa = a->dp; |
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39 tmpb = b->dp; |
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40 tmpc = c->dp; |
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41 |
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42 /* set carry to zero */ |
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43 u = 0; |
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44 for (i = 0; i < min; i++) { |
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45 /* T[i] = A[i] - B[i] - U */ |
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46 *tmpc = (*tmpa++ - *tmpb++) - u; |
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47 |
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48 /* U = carry bit of T[i] |
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49 * Note this saves performing an AND operation since |
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50 * if a carry does occur it will propagate all the way to the |
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51 * MSB. As a result a single shift is enough to get the carry |
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52 */ |
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53 u = *tmpc >> (((size_t)CHAR_BIT * sizeof(mp_digit)) - 1u); |
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54 |
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55 /* Clear carry from T[i] */ |
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56 *tmpc++ &= MP_MASK; |
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57 } |
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58 |
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59 /* now copy higher words if any, e.g. if A has more digits than B */ |
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60 for (; i < max; i++) { |
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61 /* T[i] = A[i] - U */ |
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62 *tmpc = *tmpa++ - u; |
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63 |
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64 /* U = carry bit of T[i] */ |
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65 u = *tmpc >> (((size_t)CHAR_BIT * sizeof(mp_digit)) - 1u); |
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66 |
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67 /* Clear carry from T[i] */ |
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68 *tmpc++ &= MP_MASK; |
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69 } |
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70 |
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71 /* clear digits above used (since we may not have grown result above) */ |
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72 for (i = c->used; i < olduse; i++) { |
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73 *tmpc++ = 0; |
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74 } |
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75 } |
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76 |
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77 mp_clamp(c); |
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78 return MP_OKAY; |
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79 } |
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80 |
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81 #endif |
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82 |
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83 /* ref: HEAD -> master, tag: v1.1.0 */ |
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84 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ |
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85 /* commit time: 2019-01-28 20:32:32 +0100 */ |