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annotate libtommath/bn_s_mp_sqr.c @ 1671:5c8913b7464c

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Mention Ed25519 in dropbearkey man (#94)
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 18:28:27 +0500
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_S_MP_SQR_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 /* low level squaring, b = a*a, HAC pp.596-597, Algorithm 14.16 */
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16 int s_mp_sqr(const mp_int *a, mp_int *b)
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17 {
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18 mp_int t;
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19 int res, ix, iy, pa;
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20 mp_word r;
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21 mp_digit u, tmpx, *tmpt;
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23 pa = a->used;
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24 if ((res = mp_init_size(&t, (2 * pa) + 1)) != MP_OKAY) {
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25 return res;
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26 }
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27
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28 /* default used is maximum possible size */
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29 t.used = (2 * pa) + 1;
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31 for (ix = 0; ix < pa; ix++) {
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32 /* first calculate the digit at 2*ix */
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33 /* calculate double precision result */
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34 r = (mp_word)t.dp[2*ix] +
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35 ((mp_word)a->dp[ix] * (mp_word)a->dp[ix]);
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36
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37 /* store lower part in result */
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38 t.dp[ix+ix] = (mp_digit)(r & (mp_word)MP_MASK);
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39
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40 /* get the carry */
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41 u = (mp_digit)(r >> (mp_word)DIGIT_BIT);
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43 /* left hand side of A[ix] * A[iy] */
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44 tmpx = a->dp[ix];
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46 /* alias for where to store the results */
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47 tmpt = t.dp + ((2 * ix) + 1);
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48
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49 for (iy = ix + 1; iy < pa; iy++) {
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50 /* first calculate the product */
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51 r = (mp_word)tmpx * (mp_word)a->dp[iy];
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52
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53 /* now calculate the double precision result, note we use
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54 * addition instead of *2 since it's easier to optimize
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55 */
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56 r = (mp_word)*tmpt + r + r + (mp_word)u;
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57
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58 /* store lower part */
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59 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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60
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61 /* get carry */
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62 u = (mp_digit)(r >> (mp_word)DIGIT_BIT);
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63 }
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64 /* propagate upwards */
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65 while (u != 0uL) {
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66 r = (mp_word)*tmpt + (mp_word)u;
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67 *tmpt++ = (mp_digit)(r & (mp_word)MP_MASK);
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68 u = (mp_digit)(r >> (mp_word)DIGIT_BIT);
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69 }
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70 }
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71
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72 mp_clamp(&t);
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73 mp_exch(&t, b);
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74 mp_clear(&t);
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75 return MP_OKAY;
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76 }
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77 #endif
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78
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79 /* ref: HEAD -> master, tag: v1.1.0 */
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80 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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81 /* commit time: 2019-01-28 20:32:32 +0100 */