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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, tomstdenis@gmail.com, http://math.libtomcrypt.com |
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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 |
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55 | |
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56 | /* $Source: /cvsroot/tcl/libtommath/bn_mp_sqr.c,v $ */ |
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57 | /* $Revision: 1.1.1.3 $ */ |
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58 | /* $Date: 2006/12/01 00:08:11 $ */ |
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