818d8fb7f5
* In the default settings, a cutoff X can be modified at runtime by adjusting the corresponding X_CUTOFF variable. * Tunability of the library can be disabled at compile time by defining the MP_FIXED_CUTOFFS macro. * There is an additional file tommath_cutoffs.h, which defines the default cutoffs. These can be adjusted manually or by the autotuner.
44 lines
1.0 KiB
C
44 lines
1.0 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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/* SPDX-License-Identifier: Unlicense */
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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_S_MP_TOOM_SQR_C
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/* use Toom-Cook? */
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if (a->used >= MP_TOOM_SQR_CUTOFF) {
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res = s_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_S_MP_KARATSUBA_SQR_C
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if (a->used >= MP_KARATSUBA_SQR_CUTOFF) {
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res = s_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_S_MP_SQR_FAST_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 << (((CHAR_BIT * sizeof(mp_word)) - (2u * (size_t)MP_DIGIT_BIT)) - 1u)))) {
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res = s_mp_sqr_fast(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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