Mercurial > dropbear

annotate libtommath/bn_mp_mul_2d.c @ 1918:863f31b4cf3c

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author Matt Johnston <matt@ucc.asn.au>
date Wed, 30 Mar 2022 12:03:50 +0800
parents 1051e4eea25a
children
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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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 /* SPDX-License-Identifier: Unlicense */
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6 /* shift left by a certain bit count */
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7 mp_err mp_mul_2d(const mp_int *a, int b, mp_int *c)
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8 {
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9 mp_digit d;
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10 mp_err err;
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11
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12 /* copy */
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13 if (a != c) {
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14 if ((err = mp_copy(a, c)) != MP_OKAY) {
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15 return err;
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16 }
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17 }
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18
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19 if (c->alloc < (c->used + (b / MP_DIGIT_BIT) + 1)) {
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20 if ((err = mp_grow(c, c->used + (b / MP_DIGIT_BIT) + 1)) != MP_OKAY) {
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21 return err;
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22 }
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23 }
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24
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25 /* shift by as many digits in the bit count */
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26 if (b >= MP_DIGIT_BIT) {
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27 if ((err = mp_lshd(c, b / MP_DIGIT_BIT)) != MP_OKAY) {
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28 return err;
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29 }
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30 }
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31
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32 /* shift any bit count < MP_DIGIT_BIT */
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33 d = (mp_digit)(b % MP_DIGIT_BIT);
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34 if (d != 0u) {
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35 mp_digit *tmpc, shift, mask, r, rr;
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36 int x;
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37
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38 /* bitmask for carries */
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39 mask = ((mp_digit)1 << d) - (mp_digit)1;
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41 /* shift for msbs */
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42 shift = (mp_digit)MP_DIGIT_BIT - d;
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44 /* alias */
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45 tmpc = c->dp;
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46
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47 /* carry */
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48 r = 0;
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49 for (x = 0; x < c->used; x++) {
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50 /* get the higher bits of the current word */
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51 rr = (*tmpc >> shift) & mask;
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53 /* shift the current word and OR in the carry */
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54 *tmpc = ((*tmpc << d) | r) & MP_MASK;
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55 ++tmpc;
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56
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57 /* set the carry to the carry bits of the current word */
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58 r = rr;
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59 }
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60
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61 /* set final carry */
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62 if (r != 0u) {
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63 c->dp[(c->used)++] = r;
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64 }
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65 }
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66 mp_clamp(c);
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67 return MP_OKAY;
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68 }
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69 #endif