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annotate libtommath/bn_mp_mul_2.c @ 1689:d2d3b5ba6c64

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update travis to Ubuntu focal to provide chacha20
author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 23:13:48 +0800
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MUL_2_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 /* b = a*2 */
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16 int mp_mul_2(const mp_int *a, mp_int *b)
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17 {
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18 int x, res, oldused;
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19
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20 /* grow to accomodate result */
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21 if (b->alloc < (a->used + 1)) {
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22 if ((res = mp_grow(b, a->used + 1)) != MP_OKAY) {
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23 return res;
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24 }
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25 }
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26
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27 oldused = b->used;
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28 b->used = a->used;
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30 {
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31 mp_digit r, rr, *tmpa, *tmpb;
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32
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33 /* alias for source */
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34 tmpa = a->dp;
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35
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36 /* alias for dest */
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37 tmpb = b->dp;
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38
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39 /* carry */
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40 r = 0;
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41 for (x = 0; x < a->used; x++) {
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42
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43 /* get what will be the *next* carry bit from the
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44 * MSB of the current digit
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45 */
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46 rr = *tmpa >> (mp_digit)(DIGIT_BIT - 1);
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47
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48 /* now shift up this digit, add in the carry [from the previous] */
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49 *tmpb++ = ((*tmpa++ << 1uL) | r) & MP_MASK;
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50
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51 /* copy the carry that would be from the source
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52 * digit into the next iteration
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53 */
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54 r = rr;
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55 }
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56
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57 /* new leading digit? */
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58 if (r != 0u) {
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59 /* add a MSB which is always 1 at this point */
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60 *tmpb = 1;
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61 ++(b->used);
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62 }
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63
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64 /* now zero any excess digits on the destination
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65 * that we didn't write to
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66 */
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67 tmpb = b->dp + b->used;
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68 for (x = b->used; x < oldused; x++) {
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69 *tmpb++ = 0;
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70 }
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71 }
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72 b->sign = a->sign;
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73 return MP_OKAY;
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74 }
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75 #endif
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77 /* ref: HEAD -> master, tag: v1.1.0 */
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78 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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79 /* commit time: 2019-01-28 20:32:32 +0100 */