Mercurial > dropbear

annotate libtommath/bn_s_mp_mul_digs.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
parents f52919ffd3b1
children 1051e4eea25a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "tommath_private.h"
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2 #ifdef BN_S_MP_MUL_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 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* multiplies |a| * |b| and only computes upto digs digits of result
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16 * HAC pp. 595, Algorithm 14.12 Modified so you can control how
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17 * many digits of output are created.
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18 */
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19 int s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs)
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20 {
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21 mp_int t;
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22 int res, pa, pb, ix, iy;
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23 mp_digit u;
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24 mp_word r;
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25 mp_digit tmpx, *tmpt, *tmpy;
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26
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27 /* can we use the fast multiplier? */
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28 if ((digs < (int)MP_WARRAY) &&
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29 (MIN(a->used, b->used) <
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30 (int)(1u << (((size_t)CHAR_BIT * sizeof(mp_word)) - (2u * (size_t)DIGIT_BIT))))) {
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31 return fast_s_mp_mul_digs(a, b, c, digs);
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32 }
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33
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34 if ((res = mp_init_size(&t, digs)) != MP_OKAY) {
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35 return res;
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36 }
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37 t.used = digs;
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38
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39 /* compute the digits of the product directly */
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40 pa = a->used;
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41 for (ix = 0; ix < pa; ix++) {
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42 /* set the carry to zero */
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43 u = 0;
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45 /* limit ourselves to making digs digits of output */
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46 pb = MIN(b->used, digs - ix);
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47
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48 /* setup some aliases */
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49 /* copy of the digit from a used within the nested loop */
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50 tmpx = a->dp[ix];
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51
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52 /* an alias for the destination shifted ix places */
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53 tmpt = t.dp + ix;
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54
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55 /* an alias for the digits of b */
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56 tmpy = b->dp;
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57
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58 /* compute the columns of the output and propagate the carry */
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59 for (iy = 0; iy < pb; iy++) {
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60 /* compute the column as a mp_word */
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61 r = (mp_word)*tmpt +
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62 ((mp_word)tmpx * (mp_word)*tmpy++) +
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63 (mp_word)u;
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65 /* the new column is the lower part of the result */
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66 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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68 /* get the carry word from the result */
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69 u = (mp_digit)(r >> (mp_word)DIGIT_BIT);
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70 }
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71 /* set carry if it is placed below digs */
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72 if ((ix + iy) < digs) {
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73 *tmpt = u;
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74 }
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75 }
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77 mp_clamp(&t);
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78 mp_exch(&t, c);
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79
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80 mp_clear(&t);
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81 return MP_OKAY;
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82 }
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83 #endif
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84
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85 /* ref: HEAD -> master, tag: v1.1.0 */
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86 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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87 /* commit time: 2019-01-28 20:32:32 +0100 */