tommath/bn_mp_sqr.c

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#include <tommath_private.h>
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#ifdef BN_MP_SQR_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
* additional optimizations in place.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tstdenis82@gmail.com, http://libtom.org
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*/
/* computes b = a*a */
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int mp_sqr(const mp_int *a, mp_int *b)
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{
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int res;
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#ifdef BN_MP_TOOM_SQR_C
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/* use Toom-Cook? */
if (a->used >= TOOM_SQR_CUTOFF) {
res = mp_toom_sqr(a, b);
/* Karatsuba? */
} else
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#endif
#ifdef BN_MP_KARATSUBA_SQR_C
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if (a->used >= KARATSUBA_SQR_CUTOFF) {
res = mp_karatsuba_sqr(a, b);
} else
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#endif
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{
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#ifdef BN_FAST_S_MP_SQR_C
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/* can we use the fast comba multiplier? */
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if ((((a->used * 2) + 1) < (int)MP_WARRAY) &&
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(a->used <
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(int)(1u << (((sizeof(mp_word) * (size_t)CHAR_BIT) - (2u * (size_t)DIGIT_BIT)) - 1u)))) {
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res = fast_s_mp_sqr(a, b);
} else
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#endif
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{
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#ifdef BN_S_MP_SQR_C
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res = s_mp_sqr(a, b);
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#else
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res = MP_VAL;
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#endif
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}
}
b->sign = MP_ZPOS;
return res;
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}
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#endif
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/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */