Mercurial > dropbear

annotate libtommath/bn_s_mp_sqr.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_SQR_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 squaring, b = a*a, HAC pp.596-597, Algorithm 14.16 */
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19 int s_mp_sqr (mp_int * a, mp_int * b)
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20 {
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21 mp_int t;
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22 int res, ix, iy, pa;
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23 mp_word r;
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24 mp_digit u, tmpx, *tmpt;
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25
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26 pa = a->used;
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27 if ((res = mp_init_size (&t, 2*pa + 1)) != MP_OKAY) {
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28 return res;
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29 }
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30
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31 /* default used is maximum possible size */
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32 t.used = 2*pa + 1;
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33
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34 for (ix = 0; ix < pa; ix++) {
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35 /* first calculate the digit at 2*ix */
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36 /* calculate double precision result */
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37 r = ((mp_word) t.dp[2*ix]) +
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38 ((mp_word)a->dp[ix])*((mp_word)a->dp[ix]);
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39
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40 /* store lower part in result */
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41 t.dp[ix+ix] = (mp_digit) (r & ((mp_word) MP_MASK));
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42
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43 /* get the carry */
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44 u = (mp_digit)(r >> ((mp_word) DIGIT_BIT));
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45
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46 /* left hand side of A[ix] * A[iy] */
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47 tmpx = a->dp[ix];
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48
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49 /* alias for where to store the results */
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50 tmpt = t.dp + (2*ix + 1);
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51
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52 for (iy = ix + 1; iy < pa; iy++) {
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53 /* first calculate the product */
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54 r = ((mp_word)tmpx) * ((mp_word)a->dp[iy]);
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55
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56 /* now calculate the double precision result, note we use
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57 * addition instead of *2 since it's easier to optimize
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58 */
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59 r = ((mp_word) *tmpt) + r + r + ((mp_word) u);
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60
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61 /* store lower part */
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62 *tmpt++ = (mp_digit) (r & ((mp_word) MP_MASK));
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63
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64 /* get carry */
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65 u = (mp_digit)(r >> ((mp_word) DIGIT_BIT));
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66 }
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67 /* propagate upwards */
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68 while (u != ((mp_digit) 0)) {
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69 r = ((mp_word) *tmpt) + ((mp_word) u);
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70 *tmpt++ = (mp_digit) (r & ((mp_word) MP_MASK));
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71 u = (mp_digit)(r >> ((mp_word) DIGIT_BIT));
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72 }
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73 }
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74
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75 mp_clamp (&t);
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76 mp_exch (&t, b);
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77 mp_clear (&t);
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78 return MP_OKAY;
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79 }
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80 #endif
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81
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82 /* $Source: /cvs/libtom/libtommath/bn_s_mp_sqr.c,v $ */
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83 /* $Revision: 1.3 $ */
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84 /* $Date: 2006/03/31 14:18:44 $ */