Mercurial > dropbear

annotate libtommath/bn_fast_s_mp_mul_digs.c @ 1682:a53e7d2d60be

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rsa-sha256 for ssh-agent
author Matt Johnston <matt@ucc.asn.au>
date Mon, 25 May 2020 20:23:02 +0800
parents f52919ffd3b1
children
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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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95 }
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96 }
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1593
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97 mp_clamp(c);
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Steffen Jaeckel <s_jaeckel@gmx.de>
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
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Matt Johnston <matt@ucc.asn.au>
parents: 284
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101
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1593
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102 /* ref: HEAD -> master, tag: v1.1.0 */
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1593
diff changeset
103 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1593
diff changeset
104 /* commit time: 2019-01-28 20:32:32 +0100 */