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annotate libtommath/bn_mp_mul_d.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_MUL_D_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 /* multiply by a digit */
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16 int mp_mul_d(const mp_int *a, mp_digit b, mp_int *c)
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17 {
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18 mp_digit u, *tmpa, *tmpc;
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19 mp_word r;
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20 int ix, res, olduse;
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21
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22 /* make sure c is big enough to hold a*b */
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23 if (c->alloc < (a->used + 1)) {
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24 if ((res = mp_grow(c, a->used + 1)) != MP_OKAY) {
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25 return res;
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26 }
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27 }
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29 /* get the original destinations used count */
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30 olduse = c->used;
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32 /* set the sign */
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33 c->sign = a->sign;
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35 /* alias for a->dp [source] */
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36 tmpa = a->dp;
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38 /* alias for c->dp [dest] */
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39 tmpc = c->dp;
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41 /* zero carry */
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42 u = 0;
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44 /* compute columns */
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45 for (ix = 0; ix < a->used; ix++) {
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46 /* compute product and carry sum for this term */
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47 r = (mp_word)u + ((mp_word)*tmpa++ * (mp_word)b);
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49 /* mask off higher bits to get a single digit */
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50 *tmpc++ = (mp_digit)(r & (mp_word)MP_MASK);
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52 /* send carry into next iteration */
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53 u = (mp_digit)(r >> (mp_word)DIGIT_BIT);
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54 }
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56 /* store final carry [if any] and increment ix offset */
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57 *tmpc++ = u;
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58 ++ix;
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59
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60 /* now zero digits above the top */
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61 while (ix++ < olduse) {
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62 *tmpc++ = 0;
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63 }
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64
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65 /* set used count */
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66 c->used = a->used + 1;
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67 mp_clamp(c);
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69 return MP_OKAY;
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70 }
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71 #endif
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73 /* ref: HEAD -> master, tag: v1.1.0 */
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74 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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75 /* commit time: 2019-01-28 20:32:32 +0100 */