Mercurial > dropbear

annotate libtommath/bn_mp_mul_2d.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:
rev   line source
284
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1 #include <tommath.h>
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2 #ifdef BN_MP_MUL_2D_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
284
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16 */
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17
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18 /* shift left by a certain bit count */
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19 int mp_mul_2d (mp_int * a, int b, mp_int * c)
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20 {
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21 mp_digit d;
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22 int res;
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23
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24 /* copy */
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25 if (a != c) {
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26 if ((res = mp_copy (a, c)) != MP_OKAY) {
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27 return res;
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28 }
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29 }
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30
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31 if (c->alloc < (int)(c->used + b/DIGIT_BIT + 1)) {
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32 if ((res = mp_grow (c, c->used + b / DIGIT_BIT + 1)) != MP_OKAY) {
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33 return res;
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34 }
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35 }
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36
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37 /* shift by as many digits in the bit count */
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38 if (b >= (int)DIGIT_BIT) {
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39 if ((res = mp_lshd (c, b / DIGIT_BIT)) != MP_OKAY) {
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40 return res;
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41 }
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42 }
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43
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44 /* shift any bit count < DIGIT_BIT */
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45 d = (mp_digit) (b % DIGIT_BIT);
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46 if (d != 0) {
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47 register mp_digit *tmpc, shift, mask, r, rr;
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48 register int x;
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49
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50 /* bitmask for carries */
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51 mask = (((mp_digit)1) << d) - 1;
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52
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53 /* shift for msbs */
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54 shift = DIGIT_BIT - d;
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55
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56 /* alias */
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57 tmpc = c->dp;
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58
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59 /* carry */
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60 r = 0;
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61 for (x = 0; x < c->used; x++) {
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62 /* get the higher bits of the current word */
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63 rr = (*tmpc >> shift) & mask;
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64
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65 /* shift the current word and OR in the carry */
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66 *tmpc = ((*tmpc << d) | r) & MP_MASK;
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67 ++tmpc;
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68
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69 /* set the carry to the carry bits of the current word */
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70 r = rr;
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71 }
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72
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73 /* set final carry */
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74 if (r != 0) {
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75 c->dp[(c->used)++] = r;
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76 }
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77 }
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78 mp_clamp (c);
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79 return MP_OKAY;
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80 }
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81 #endif
389
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82
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83 /* $Source: /cvs/libtom/libtommath/bn_mp_mul_2d.c,v $ */
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84 /* $Revision: 1.3 $ */
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85 /* $Date: 2006/03/31 14:18:44 $ */