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annotate libtommath/bn_mp_lshd.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 1051e4eea25a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_LSHD_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 /* shift left a certain amount of digits */
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16 int mp_lshd(mp_int *a, int b)
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17 {
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18 int x, res;
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20 /* if its less than zero return */
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21 if (b <= 0) {
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22 return MP_OKAY;
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23 }
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24 /* no need to shift 0 around */
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25 if (mp_iszero(a) == MP_YES) {
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26 return MP_OKAY;
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27 }
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28
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29 /* grow to fit the new digits */
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30 if (a->alloc < (a->used + b)) {
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31 if ((res = mp_grow(a, a->used + b)) != MP_OKAY) {
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32 return res;
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33 }
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34 }
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35
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36 {
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37 mp_digit *top, *bottom;
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39 /* increment the used by the shift amount then copy upwards */
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40 a->used += b;
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42 /* top */
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43 top = a->dp + a->used - 1;
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44
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45 /* base */
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46 bottom = (a->dp + a->used - 1) - b;
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47
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48 /* much like mp_rshd this is implemented using a sliding window
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49 * except the window goes the otherway around. Copying from
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50 * the bottom to the top. see bn_mp_rshd.c for more info.
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51 */
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52 for (x = a->used - 1; x >= b; x--) {
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53 *top-- = *bottom--;
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54 }
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55
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56 /* zero the lower digits */
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57 top = a->dp;
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58 for (x = 0; x < b; x++) {
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59 *top++ = 0;
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60 }
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61 }
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62 return MP_OKAY;
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63 }
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64 #endif
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65
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66 /* ref: HEAD -> master, tag: v1.1.0 */
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67 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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68 /* commit time: 2019-01-28 20:32:32 +0100 */