Mercurial > dropbear
annotate libtommath/bn_s_mp_sqr.c @ 1655:f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
* make key-generation compliant to FIPS 186.4
* fix includes in tommath_class.h
* update fuzzcorpus instead of error-out
* fixup fuzzing make-targets
* update Makefile.in
* apply necessary patches to ltm sources
* clean-up not required ltm files
* update to vanilla ltm 1.1.0
this already only contains the required files
* remove set/get double
author | Steffen Jaeckel <s_jaeckel@gmx.de> |
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date | Mon, 16 Sep 2019 15:50:38 +0200 |
parents | 8bba51a55704 |
children | 1051e4eea25a |
rev | line source |
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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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22 |
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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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30 |
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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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42 |
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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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45 |
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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 */ |