57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
#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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*
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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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*
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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
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* additional optimizations in place.
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*
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* SPDX-License-Identifier: Unlicense
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*/
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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? */
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if (a->used >= TOOM_SQR_CUTOFF) {
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res = mp_toom_sqr(a, b);
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/* Karatsuba? */
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} else
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#endif
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#ifdef BN_MP_KARATSUBA_SQR_C
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if (a->used >= KARATSUBA_SQR_CUTOFF) {
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res = mp_karatsuba_sqr(a, b);
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} 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);
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} 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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}
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}
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b->sign = MP_ZPOS;
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return res;
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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