Mercurial > dropbear

annotate libtommath/bn_s_mp_sub.c @ 1156:a8f4dade70e5

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avoid getpass when not used some systems (like android's bionic) do not provide getpass. you can disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid its use (and rely on pubkey auth), but the link still fails because the support file calls getpass. do not define this func if both of those auth methods are not used.
author Mike Frysinger <vapier@gentoo.org>
date Wed, 21 Oct 2015 22:39:55 +0800
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include <tommath.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 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.com
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16 */
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17
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18 /* low level subtraction (assumes |a| > |b|), HAC pp.595 Algorithm 14.9 */
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19 int
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20 s_mp_sub (mp_int * a, mp_int * b, mp_int * c)
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21 {
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22 int olduse, res, min, max;
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23
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24 /* find sizes */
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25 min = b->used;
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26 max = a->used;
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27
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28 /* init result */
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29 if (c->alloc < max) {
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30 if ((res = mp_grow (c, max)) != MP_OKAY) {
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31 return res;
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32 }
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33 }
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34 olduse = c->used;
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35 c->used = max;
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36
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37 {
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38 register mp_digit u, *tmpa, *tmpb, *tmpc;
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39 register int i;
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40
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41 /* alias for digit pointers */
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42 tmpa = a->dp;
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43 tmpb = b->dp;
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44 tmpc = c->dp;
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45
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46 /* set carry to zero */
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47 u = 0;
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48 for (i = 0; i < min; i++) {
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49 /* T[i] = A[i] - B[i] - U */
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50 *tmpc = *tmpa++ - *tmpb++ - u;
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51
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52 /* U = carry bit of T[i]
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53 * Note this saves performing an AND operation since
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54 * if a carry does occur it will propagate all the way to the
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55 * MSB. As a result a single shift is enough to get the carry
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56 */
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57 u = *tmpc >> ((mp_digit)(CHAR_BIT * sizeof (mp_digit) - 1));
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58
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59 /* Clear carry from T[i] */
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60 *tmpc++ &= MP_MASK;
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61 }
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62
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63 /* now copy higher words if any, e.g. if A has more digits than B */
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64 for (; i < max; i++) {
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65 /* T[i] = A[i] - U */
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66 *tmpc = *tmpa++ - u;
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67
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68 /* U = carry bit of T[i] */
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69 u = *tmpc >> ((mp_digit)(CHAR_BIT * sizeof (mp_digit) - 1));
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70
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71 /* Clear carry from T[i] */
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72 *tmpc++ &= MP_MASK;
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73 }
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74
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75 /* clear digits above used (since we may not have grown result above) */
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76 for (i = c->used; i < olduse; i++) {
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77 *tmpc++ = 0;
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78 }
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79 }
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80
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81 mp_clamp (c);
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82 return MP_OKAY;
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83 }
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84
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85 #endif
389
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86
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87 /* $Source: /cvs/libtom/libtommath/bn_s_mp_sub.c,v $ */
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diff changeset
88 /* $Revision: 1.3 $ */
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diff changeset
89 /* $Date: 2006/03/31 14:18:44 $ */