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annotate libtommath/bn_mp_sqr.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents f52919ffd3b1
children 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_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 /* computes b = a*a */
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16 int mp_sqr(const mp_int *a, mp_int *b)
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17 {
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18 int res;
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19
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20 #ifdef BN_MP_TOOM_SQR_C
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21 /* use Toom-Cook? */
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22 if (a->used >= TOOM_SQR_CUTOFF) {
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23 res = mp_toom_sqr(a, b);
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24 /* Karatsuba? */
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25 } else
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26 #endif
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27 #ifdef BN_MP_KARATSUBA_SQR_C
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28 if (a->used >= KARATSUBA_SQR_CUTOFF) {
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29 res = mp_karatsuba_sqr(a, b);
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30 } else
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31 #endif
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32 {
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33 #ifdef BN_FAST_S_MP_SQR_C
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34 /* can we use the fast comba multiplier? */
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35 if ((((a->used * 2) + 1) < (int)MP_WARRAY) &&
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36 (a->used <
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37 (int)(1u << (((sizeof(mp_word) * (size_t)CHAR_BIT) - (2u * (size_t)DIGIT_BIT)) - 1u)))) {
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38 res = fast_s_mp_sqr(a, b);
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39 } else
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40 #endif
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41 {
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42 #ifdef BN_S_MP_SQR_C
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43 res = s_mp_sqr(a, b);
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44 #else
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45 res = MP_VAL;
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46 #endif
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47 }
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48 }
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49 b->sign = MP_ZPOS;
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50 return res;
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51 }
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52 #endif
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53
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54 /* ref: HEAD -> master, tag: v1.1.0 */
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55 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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56 /* commit time: 2019-01-28 20:32:32 +0100 */