Mercurial > dropbear

annotate libtommath/bn_mp_sqr.c @ 1520:84578193ef47

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 18 Feb 2018 23:48:32 +0800
parents 8bba51a55704
children f52919ffd3b1
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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 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://libtom.org
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16 */
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17
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18 /* computes b = a*a */
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19 int
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20 mp_sqr (mp_int * a, mp_int * b)
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21 {
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22 int res;
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23
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24 #ifdef BN_MP_TOOM_SQR_C
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25 /* use Toom-Cook? */
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26 if (a->used >= TOOM_SQR_CUTOFF) {
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27 res = mp_toom_sqr(a, b);
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28 /* Karatsuba? */
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29 } else
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30 #endif
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31 #ifdef BN_MP_KARATSUBA_SQR_C
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32 if (a->used >= KARATSUBA_SQR_CUTOFF) {
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33 res = mp_karatsuba_sqr (a, b);
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34 } else
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35 #endif
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36 {
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37 #ifdef BN_FAST_S_MP_SQR_C
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38 /* can we use the fast comba multiplier? */
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39 if ((((a->used * 2) + 1) < MP_WARRAY) &&
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40 (a->used <
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41 (1 << (((sizeof(mp_word) * CHAR_BIT) - (2 * DIGIT_BIT)) - 1)))) {
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42 res = fast_s_mp_sqr (a, b);
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43 } else
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44 #endif
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45 {
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46 #ifdef BN_S_MP_SQR_C
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47 res = s_mp_sqr (a, b);
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48 #else
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49 res = MP_VAL;
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50 #endif
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51 }
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52 }
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53 b->sign = MP_ZPOS;
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54 return res;
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55 }
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56 #endif
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57
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58 /* ref: $Format:%D$ */
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59 /* git commit: $Format:%H$ */
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60 /* commit time: $Format:%ai$ */