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annotate libtommath/bn_mp_mul_2d.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_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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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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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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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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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 */