Mercurial > dropbear

annotate libtommath/bn_mp_mul_d.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_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 * 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 /* multiply by a digit */
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19 int
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20 mp_mul_d (mp_int * a, mp_digit b, mp_int * c)
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21 {
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22 mp_digit u, *tmpa, *tmpc;
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23 mp_word r;
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24 int ix, res, olduse;
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25
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26 /* make sure c is big enough to hold a*b */
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27 if (c->alloc < a->used + 1) {
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28 if ((res = mp_grow (c, a->used + 1)) != MP_OKAY) {
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29 return res;
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30 }
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31 }
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32
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33 /* get the original destinations used count */
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34 olduse = c->used;
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35
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36 /* set the sign */
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37 c->sign = a->sign;
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38
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39 /* alias for a->dp [source] */
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40 tmpa = a->dp;
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41
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42 /* alias for c->dp [dest] */
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43 tmpc = c->dp;
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44
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45 /* zero carry */
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46 u = 0;
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47
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48 /* compute columns */
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49 for (ix = 0; ix < a->used; ix++) {
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50 /* compute product and carry sum for this term */
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51 r = ((mp_word) u) + ((mp_word)*tmpa++) * ((mp_word)b);
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52
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53 /* mask off higher bits to get a single digit */
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54 *tmpc++ = (mp_digit) (r & ((mp_word) MP_MASK));
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55
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56 /* send carry into next iteration */
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57 u = (mp_digit) (r >> ((mp_word) DIGIT_BIT));
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58 }
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59
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60 /* store final carry [if any] and increment ix offset */
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61 *tmpc++ = u;
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62 ++ix;
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63
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64 /* now zero digits above the top */
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65 while (ix++ < olduse) {
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66 *tmpc++ = 0;
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67 }
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68
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69 /* set used count */
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70 c->used = a->used + 1;
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71 mp_clamp(c);
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72
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73 return MP_OKAY;
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74 }
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75 #endif
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76
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77 /* $Source: /cvs/libtom/libtommath/bn_mp_mul_d.c,v $ */
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78 /* $Revision: 1.3 $ */
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79 /* $Date: 2006/03/31 14:18:44 $ */