Mercurial > dropbear

annotate libtommath/bn_s_mp_sqr.c @ 1843:03dfecca99bd

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Use sudo for the real github action job (Wasn't required by act's runner)
author Matt Johnston <matt@ucc.asn.au>
date Mon, 18 Oct 2021 23:25:20 +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_S_MP_SQR_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 /* low level squaring, b = a*a, HAC pp.596-597, Algorithm 14.16 */
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7 mp_err s_mp_sqr(const mp_int *a, mp_int *b)
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8 {
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9 mp_int t;
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10 int ix, iy, pa;
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11 mp_err err;
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12 mp_word r;
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13 mp_digit u, tmpx, *tmpt;
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14
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15 pa = a->used;
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16 if ((err = mp_init_size(&t, (2 * pa) + 1)) != MP_OKAY) {
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17 return err;
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18 }
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20 /* default used is maximum possible size */
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21 t.used = (2 * pa) + 1;
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23 for (ix = 0; ix < pa; ix++) {
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24 /* first calculate the digit at 2*ix */
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25 /* calculate double precision result */
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26 r = (mp_word)t.dp[2*ix] +
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27 ((mp_word)a->dp[ix] * (mp_word)a->dp[ix]);
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29 /* store lower part in result */
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30 t.dp[ix+ix] = (mp_digit)(r & (mp_word)MP_MASK);
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32 /* get the carry */
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33 u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
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35 /* left hand side of A[ix] * A[iy] */
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36 tmpx = a->dp[ix];
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38 /* alias for where to store the results */
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39 tmpt = t.dp + ((2 * ix) + 1);
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41 for (iy = ix + 1; iy < pa; iy++) {
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42 /* first calculate the product */
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43 r = (mp_word)tmpx * (mp_word)a->dp[iy];
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45 /* now calculate the double precision result, note we use
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46 * addition instead of *2 since it's easier to optimize
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47 */
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48 r = (mp_word)*tmpt + r + r + (mp_word)u;
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50 /* store lower part */
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51 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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53 /* get carry */
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54 u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
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55 }
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56 /* propagate upwards */
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57 while (u != 0uL) {
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58 r = (mp_word)*tmpt + (mp_word)u;
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59 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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60 u = (mp_digit)(r >> (mp_word)MP_DIGIT_BIT);
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61 }
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62 }
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64 mp_clamp(&t);
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65 mp_exch(&t, b);
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66 mp_clear(&t);
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67 return MP_OKAY;
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68 }
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69 #endif