Mercurial > dropbear

annotate libtommath/bn_mp_mul_2.c @ 447:278805938dcf

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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>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 5ff8218bcee9
children 60fc6476e044
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include <tommath.h>
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2 #ifdef BN_MP_MUL_2_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
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16 */
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17
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18 /* b = a*2 */
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19 int mp_mul_2(mp_int * a, mp_int * b)
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20 {
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21 int x, res, oldused;
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22
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23 /* grow to accomodate result */
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24 if (b->alloc < a->used + 1) {
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25 if ((res = mp_grow (b, a->used + 1)) != MP_OKAY) {
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26 return res;
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27 }
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28 }
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29
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30 oldused = b->used;
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31 b->used = a->used;
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32
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33 {
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34 register mp_digit r, rr, *tmpa, *tmpb;
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35
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36 /* alias for source */
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37 tmpa = a->dp;
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38
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39 /* alias for dest */
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40 tmpb = b->dp;
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41
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42 /* carry */
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43 r = 0;
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44 for (x = 0; x < a->used; x++) {
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45
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46 /* get what will be the *next* carry bit from the
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47 * MSB of the current digit
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48 */
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49 rr = *tmpa >> ((mp_digit)(DIGIT_BIT - 1));
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50
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51 /* now shift up this digit, add in the carry [from the previous] */
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52 *tmpb++ = ((*tmpa++ << ((mp_digit)1)) | r) & MP_MASK;
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53
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54 /* copy the carry that would be from the source
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55 * digit into the next iteration
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56 */
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57 r = rr;
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58 }
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59
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60 /* new leading digit? */
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61 if (r != 0) {
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62 /* add a MSB which is always 1 at this point */
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63 *tmpb = 1;
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64 ++(b->used);
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65 }
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66
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67 /* now zero any excess digits on the destination
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68 * that we didn't write to
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69 */
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70 tmpb = b->dp + b->used;
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71 for (x = b->used; x < oldused; x++) {
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72 *tmpb++ = 0;
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73 }
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74 }
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75 b->sign = a->sign;
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76 return MP_OKAY;
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77 }
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78 #endif
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79
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80 /* $Source: /cvs/libtom/libtommath/bn_mp_mul_2.c,v $ */
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81 /* $Revision: 1.3 $ */
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82 /* $Date: 2006/03/31 14:18:44 $ */