Mercurial > dropbear

annotate libtommath/bn_fast_s_mp_sqr.c @ 1663:c795520269f9

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Fallback for key gen without hard link support (#89) Add a non-atomic fallback for key generation on platforms where link() is not permitted (such as most stock Android installs) or on filesystems without hard link support (such as FAT).
author Matt Robinson <git@nerdoftheherd.com>
date Sat, 14 Mar 2020 14:37:35 +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_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 /* the jist of squaring...
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16 * you do like mult except the offset of the tmpx [one that
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17 * starts closer to zero] can't equal the offset of tmpy.
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18 * So basically you set up iy like before then you min it with
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19 * (ty-tx) so that it never happens. You double all those
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20 * you add in the inner loop
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21
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22 After that loop you do the squares and add them in.
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23 */
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24
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25 int fast_s_mp_sqr(const mp_int *a, mp_int *b)
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26 {
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27 int olduse, res, pa, ix, iz;
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28 mp_digit W[MP_WARRAY], *tmpx;
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29 mp_word W1;
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30
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31 /* grow the destination as required */
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32 pa = a->used + a->used;
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33 if (b->alloc < pa) {
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34 if ((res = mp_grow(b, pa)) != MP_OKAY) {
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35 return res;
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36 }
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37 }
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38
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39 /* number of output digits to produce */
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40 W1 = 0;
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41 for (ix = 0; ix < pa; ix++) {
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42 int tx, ty, iy;
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43 mp_word _W;
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44 mp_digit *tmpy;
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46 /* clear counter */
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47 _W = 0;
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48
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49 /* get offsets into the two bignums */
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50 ty = MIN(a->used-1, ix);
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51 tx = ix - ty;
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52
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53 /* setup temp aliases */
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54 tmpx = a->dp + tx;
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55 tmpy = a->dp + ty;
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56
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57 /* this is the number of times the loop will iterrate, essentially
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58 while (tx++ < a->used && ty-- >= 0) { ... }
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59 */
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60 iy = MIN(a->used-tx, ty+1);
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61
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62 /* now for squaring tx can never equal ty
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63 * we halve the distance since they approach at a rate of 2x
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64 * and we have to round because odd cases need to be executed
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65 */
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66 iy = MIN(iy, ((ty-tx)+1)>>1);
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67
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68 /* execute loop */
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69 for (iz = 0; iz < iy; iz++) {
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70 _W += (mp_word)*tmpx++ * (mp_word)*tmpy--;
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71 }
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73 /* double the inner product and add carry */
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74 _W = _W + _W + W1;
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75
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76 /* even columns have the square term in them */
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77 if (((unsigned)ix & 1u) == 0u) {
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78 _W += (mp_word)a->dp[ix>>1] * (mp_word)a->dp[ix>>1];
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79 }
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81 /* store it */
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82 W[ix] = _W & MP_MASK;
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84 /* make next carry */
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85 W1 = _W >> (mp_word)DIGIT_BIT;
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86 }
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87
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88 /* setup dest */
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89 olduse = b->used;
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90 b->used = a->used+a->used;
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91
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92 {
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93 mp_digit *tmpb;
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94 tmpb = b->dp;
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95 for (ix = 0; ix < pa; ix++) {
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96 *tmpb++ = W[ix] & MP_MASK;
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parents: 1470
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97 }
284
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98
1655
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99 /* clear unused digits [that existed in the old copy of c] */
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100 for (; ix < olduse; ix++) {
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101 *tmpb++ = 0;
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102 }
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103 }
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104 mp_clamp(b);
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105 return MP_OKAY;
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106 }
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107 #endif
389
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108
1655
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109 /* ref: HEAD -> master, tag: v1.1.0 */
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110 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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111 /* commit time: 2019-01-28 20:32:32 +0100 */