Mercurial > dropbear

annotate libtommath/bn_s_mp_sqr.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_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 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* low level squaring, b = a*a, HAC pp.596-597, Algorithm 14.16 */
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16 int s_mp_sqr(const mp_int *a, mp_int *b)
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17 {
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18 mp_int t;
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19 int res, ix, iy, pa;
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20 mp_word r;
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21 mp_digit u, tmpx, *tmpt;
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23 pa = a->used;
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24 if ((res = mp_init_size(&t, (2 * pa) + 1)) != MP_OKAY) {
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25 return res;
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26 }
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28 /* default used is maximum possible size */
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29 t.used = (2 * pa) + 1;
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31 for (ix = 0; ix < pa; ix++) {
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32 /* first calculate the digit at 2*ix */
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33 /* calculate double precision result */
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34 r = (mp_word)t.dp[2*ix] +
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35 ((mp_word)a->dp[ix] * (mp_word)a->dp[ix]);
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36
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37 /* store lower part in result */
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38 t.dp[ix+ix] = (mp_digit)(r & (mp_word)MP_MASK);
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39
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40 /* get the carry */
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41 u = (mp_digit)(r >> (mp_word)DIGIT_BIT);
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43 /* left hand side of A[ix] * A[iy] */
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44 tmpx = a->dp[ix];
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46 /* alias for where to store the results */
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47 tmpt = t.dp + ((2 * ix) + 1);
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48
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49 for (iy = ix + 1; iy < pa; iy++) {
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50 /* first calculate the product */
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51 r = (mp_word)tmpx * (mp_word)a->dp[iy];
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52
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53 /* now calculate the double precision result, note we use
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54 * addition instead of *2 since it's easier to optimize
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55 */
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56 r = (mp_word)*tmpt + r + r + (mp_word)u;
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57
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58 /* store lower part */
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59 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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61 /* get carry */
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62 u = (mp_digit)(r >> (mp_word)DIGIT_BIT);
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63 }
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64 /* propagate upwards */
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65 while (u != 0uL) {
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66 r = (mp_word)*tmpt + (mp_word)u;
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67 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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68 u = (mp_digit)(r >> (mp_word)DIGIT_BIT);
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69 }
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70 }
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72 mp_clamp(&t);
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73 mp_exch(&t, b);
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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 /* ref: HEAD -> master, tag: v1.1.0 */
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80 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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81 /* commit time: 2019-01-28 20:32:32 +0100 */