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annotate libtommath/bn_s_mp_sqr.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_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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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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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 */