Mercurial > dropbear

annotate libtommath/bn_s_mp_mul_high_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
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1 #include "tommath_private.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 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* multiplies |a| * |b| and does not compute the lower digs digits
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16 * [meant to get the higher part of the product]
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17 */
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18 int s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs)
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19 {
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20 mp_int t;
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21 int res, pa, pb, ix, iy;
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22 mp_digit u;
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23 mp_word r;
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24 mp_digit tmpx, *tmpt, *tmpy;
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26 /* can we use the fast multiplier? */
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27 #ifdef BN_FAST_S_MP_MUL_HIGH_DIGS_C
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28 if (((a->used + b->used + 1) < (int)MP_WARRAY)
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29 && (MIN(a->used, b->used) < (int)(1u << (((size_t)CHAR_BIT * sizeof(mp_word)) - (2u * (size_t)DIGIT_BIT))))) {
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30 return fast_s_mp_mul_high_digs(a, b, c, digs);
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31 }
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32 #endif
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33
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34 if ((res = mp_init_size(&t, a->used + b->used + 1)) != MP_OKAY) {
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35 return res;
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36 }
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37 t.used = a->used + b->used + 1;
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38
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39 pa = a->used;
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40 pb = b->used;
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41 for (ix = 0; ix < pa; ix++) {
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42 /* clear the carry */
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43 u = 0;
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44
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45 /* left hand side of A[ix] * B[iy] */
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46 tmpx = a->dp[ix];
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47
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48 /* alias to the address of where the digits will be stored */
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49 tmpt = &(t.dp[digs]);
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51 /* alias for where to read the right hand side from */
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52 tmpy = b->dp + (digs - ix);
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53
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54 for (iy = digs - ix; iy < pb; iy++) {
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55 /* calculate the double precision result */
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56 r = (mp_word)*tmpt +
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57 ((mp_word)tmpx * (mp_word)*tmpy++) +
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58 (mp_word)u;
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59
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60 /* get the lower part */
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61 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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62
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63 /* carry the carry */
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64 u = (mp_digit)(r >> (mp_word)DIGIT_BIT);
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65 }
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66 *tmpt = u;
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67 }
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68 mp_clamp(&t);
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69 mp_exch(&t, c);
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70 mp_clear(&t);
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71 return MP_OKAY;
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72 }
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73 #endif
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75 /* ref: HEAD -> master, tag: v1.1.0 */
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76 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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77 /* commit time: 2019-01-28 20:32:32 +0100 */