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annotate libtommath/bn_mp_mul_2d.c @ 1661:6a6a0bac52f4

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author Matt Johnston <matt@ucc.asn.au>
date Sat, 14 Mar 2020 23:26:37 +0800
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MUL_2D_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 by a certain bit count */
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16 int mp_mul_2d(const mp_int *a, int b, mp_int *c)
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17 {
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18 mp_digit d;
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19 int res;
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20
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21 /* copy */
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22 if (a != c) {
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23 if ((res = mp_copy(a, c)) != MP_OKAY) {
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24 return res;
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25 }
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26 }
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27
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28 if (c->alloc < (c->used + (b / DIGIT_BIT) + 1)) {
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29 if ((res = mp_grow(c, c->used + (b / DIGIT_BIT) + 1)) != MP_OKAY) {
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30 return res;
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31 }
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32 }
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33
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34 /* shift by as many digits in the bit count */
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35 if (b >= DIGIT_BIT) {
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36 if ((res = mp_lshd(c, b / DIGIT_BIT)) != MP_OKAY) {
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37 return res;
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38 }
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39 }
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40
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41 /* shift any bit count < DIGIT_BIT */
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42 d = (mp_digit)(b % DIGIT_BIT);
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43 if (d != 0u) {
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44 mp_digit *tmpc, shift, mask, r, rr;
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45 int x;
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46
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47 /* bitmask for carries */
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48 mask = ((mp_digit)1 << d) - (mp_digit)1;
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49
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50 /* shift for msbs */
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51 shift = (mp_digit)DIGIT_BIT - d;
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52
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53 /* alias */
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54 tmpc = c->dp;
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55
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56 /* carry */
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57 r = 0;
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58 for (x = 0; x < c->used; x++) {
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59 /* get the higher bits of the current word */
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60 rr = (*tmpc >> shift) & mask;
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61
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62 /* shift the current word and OR in the carry */
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63 *tmpc = ((*tmpc << d) | r) & MP_MASK;
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64 ++tmpc;
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65
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66 /* set the carry to the carry bits of the current word */
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67 r = rr;
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68 }
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69
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70 /* set final carry */
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71 if (r != 0u) {
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72 c->dp[(c->used)++] = r;
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73 }
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74 }
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75 mp_clamp(c);
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76 return MP_OKAY;
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77 }
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78 #endif
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79
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80 /* ref: HEAD -> master, tag: v1.1.0 */
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81 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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82 /* commit time: 2019-01-28 20:32:32 +0100 */