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annotate libtommath/bn_mp_lshd.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents f52919ffd3b1
children 1051e4eea25a
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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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19
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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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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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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 */