Mercurial > dropbear

annotate libtommath/bn_s_mp_mul_high_digs.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_S_MP_MUL_HIGH_DIGS_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 /* multiplies |a| * |b| and does not compute the lower digs digits
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19 * [meant to get the higher part of the product]
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20 */
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21 int
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22 s_mp_mul_high_digs (mp_int * a, mp_int * b, mp_int * c, int digs)
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23 {
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24 mp_int t;
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25 int res, pa, pb, ix, iy;
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26 mp_digit u;
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27 mp_word r;
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28 mp_digit tmpx, *tmpt, *tmpy;
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29
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30 /* can we use the fast multiplier? */
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31 #ifdef BN_FAST_S_MP_MUL_HIGH_DIGS_C
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32 if (((a->used + b->used + 1) < MP_WARRAY)
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33 && MIN (a->used, b->used) < (1 << ((CHAR_BIT * sizeof (mp_word)) - (2 * DIGIT_BIT)))) {
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34 return fast_s_mp_mul_high_digs (a, b, c, digs);
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35 }
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36 #endif
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37
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38 if ((res = mp_init_size (&t, a->used + b->used + 1)) != MP_OKAY) {
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39 return res;
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40 }
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41 t.used = a->used + b->used + 1;
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42
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43 pa = a->used;
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44 pb = b->used;
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45 for (ix = 0; ix < pa; ix++) {
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46 /* clear the carry */
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47 u = 0;
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48
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49 /* left hand side of A[ix] * B[iy] */
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50 tmpx = a->dp[ix];
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51
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52 /* alias to the address of where the digits will be stored */
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53 tmpt = &(t.dp[digs]);
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54
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55 /* alias for where to read the right hand side from */
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56 tmpy = b->dp + (digs - ix);
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57
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58 for (iy = digs - ix; iy < pb; iy++) {
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59 /* calculate the double precision result */
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60 r = ((mp_word)*tmpt) +
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61 ((mp_word)tmpx) * ((mp_word)*tmpy++) +
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62 ((mp_word) u);
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63
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64 /* get the lower part */
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65 *tmpt++ = (mp_digit) (r & ((mp_word) MP_MASK));
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66
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67 /* carry the carry */
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68 u = (mp_digit) (r >> ((mp_word) DIGIT_BIT));
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69 }
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70 *tmpt = u;
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71 }
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72 mp_clamp (&t);
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73 mp_exch (&t, c);
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74 mp_clear (&t);
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75 return MP_OKAY;
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76 }
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77 #endif
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78
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79 /* $Source: /cvs/libtom/libtommath/bn_s_mp_mul_high_digs.c,v $ */
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80 /* $Revision: 1.3 $ */
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81 /* $Date: 2006/03/31 14:18:44 $ */