Mercurial > dropbear

annotate libtommath/bn_fast_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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include "tommath_private.h"
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2 #ifdef BN_FAST_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 /* Fast (comba) multiplier
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16 *
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17 * This is the fast column-array [comba] multiplier. It is
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18 * designed to compute the columns of the product first
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19 * then handle the carries afterwards. This has the effect
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20 * of making the nested loops that compute the columns very
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21 * simple and schedulable on super-scalar processors.
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22 *
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23 * This has been modified to produce a variable number of
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24 * digits of output so if say only a half-product is required
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25 * you don't have to compute the upper half (a feature
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26 * required for fast Barrett reduction).
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27 *
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28 * Based on Algorithm 14.12 on pp.595 of HAC.
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29 *
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30 */
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31 int fast_s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs)
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32 {
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33 int olduse, res, pa, ix, iz;
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34 mp_digit W[MP_WARRAY];
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35 mp_word _W;
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36
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37 /* grow the destination as required */
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38 if (c->alloc < digs) {
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39 if ((res = mp_grow(c, digs)) != MP_OKAY) {
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40 return res;
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41 }
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42 }
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43
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44 /* number of output digits to produce */
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45 pa = MIN(digs, a->used + b->used);
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46
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47 /* clear the carry */
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48 _W = 0;
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49 for (ix = 0; ix < pa; ix++) {
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50 int tx, ty;
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51 int iy;
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52 mp_digit *tmpx, *tmpy;
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53
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54 /* get offsets into the two bignums */
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55 ty = MIN(b->used-1, ix);
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56 tx = ix - ty;
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57
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58 /* setup temp aliases */
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59 tmpx = a->dp + tx;
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60 tmpy = b->dp + ty;
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61
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62 /* this is the number of times the loop will iterrate, essentially
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63 while (tx++ < a->used && ty-- >= 0) { ... }
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64 */
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65 iy = MIN(a->used-tx, ty+1);
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66
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67 /* execute loop */
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68 for (iz = 0; iz < iy; ++iz) {
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69 _W += (mp_word)*tmpx++ * (mp_word)*tmpy--;
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70
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71 }
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72
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73 /* store term */
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74 W[ix] = (mp_digit)_W & MP_MASK;
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75
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76 /* make next carry */
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77 _W = _W >> (mp_word)DIGIT_BIT;
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78 }
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79
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80 /* setup dest */
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81 olduse = c->used;
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82 c->used = pa;
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83
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84 {
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85 mp_digit *tmpc;
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86 tmpc = c->dp;
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87 for (ix = 0; ix < pa; ix++) {
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88 /* now extract the previous digit [below the carry] */
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89 *tmpc++ = W[ix];
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90 }
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91
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92 /* clear unused digits [that existed in the old copy of c] */
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93 for (; ix < olduse; ix++) {
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94 *tmpc++ = 0;
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parents: 1593
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95 }
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parents: 1593
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96 }
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parents: 1593
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97 mp_clamp(c);
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parents: 1593
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98 return MP_OKAY;
284
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
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parents:
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99 }
eed26cff980b propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583)
Matt Johnston <matt@ucc.asn.au>
parents:
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100 #endif
389
5ff8218bcee9 propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e)
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parents: 284
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101
1655
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parents: 1593
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102 /* ref: HEAD -> master, tag: v1.1.0 */
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parents: 1593
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103 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1593
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104 /* commit time: 2019-01-28 20:32:32 +0100 */