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1 #include <tommath.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://math.libtomcrypt.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 #ifdef BN_S_MP_SQR_C |
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46 res = s_mp_sqr (a, b); |
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47 #else |
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48 res = MP_VAL; |
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49 #endif |
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50 } |
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51 b->sign = MP_ZPOS; |
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52 return res; |
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53 } |
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54 #endif |
