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annotate libtommath/bn_mp_montgomery_calc_normalization.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_MP_MONTGOMERY_CALC_NORMALIZATION_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 /*
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16 * shifts with subtractions when the result is greater than b.
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17 *
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18 * The method is slightly modified to shift B unconditionally upto just under
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19 * the leading bit of b. This saves alot of multiple precision shifting.
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20 */
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21 int mp_montgomery_calc_normalization(mp_int *a, const mp_int *b)
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22 {
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23 int x, bits, res;
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24
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25 /* how many bits of last digit does b use */
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26 bits = mp_count_bits(b) % DIGIT_BIT;
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28 if (b->used > 1) {
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29 if ((res = mp_2expt(a, ((b->used - 1) * DIGIT_BIT) + bits - 1)) != MP_OKAY) {
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30 return res;
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31 }
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32 } else {
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33 mp_set(a, 1uL);
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34 bits = 1;
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35 }
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37
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38 /* now compute C = A * B mod b */
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39 for (x = bits - 1; x < (int)DIGIT_BIT; x++) {
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40 if ((res = mp_mul_2(a, a)) != MP_OKAY) {
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41 return res;
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42 }
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43 if (mp_cmp_mag(a, b) != MP_LT) {
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44 if ((res = s_mp_sub(a, b, a)) != MP_OKAY) {
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45 return res;
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46 }
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47 }
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48 }
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49
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50 return MP_OKAY;
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51 }
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52 #endif
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53
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54 /* ref: HEAD -> master, tag: v1.1.0 */
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55 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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56 /* commit time: 2019-01-28 20:32:32 +0100 */