29 lines
877 B
C
29 lines
877 B
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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mp_err mp_sqr(const mp_int *a, mp_int *b)
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{
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mp_err err;
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if (MP_HAS(S_MP_TOOM_SQR) && /* use Toom-Cook? */
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a->used >= MP_TOOM_SQR_CUTOFF) {
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err = s_mp_toom_sqr(a, b);
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} else if (MP_HAS(S_MP_KARATSUBA_SQR) && /* Karatsuba? */
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a->used >= MP_KARATSUBA_SQR_CUTOFF) {
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err = s_mp_karatsuba_sqr(a, b);
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} else if (MP_HAS(S_MP_SQR_FAST) && /* can we use the fast comba multiplier? */
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(((a->used * 2) + 1) < MP_WARRAY) &&
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(a->used < (MP_MAXFAST / 2))) {
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err = s_mp_sqr_fast(a, b);
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} else if (MP_HAS(S_MP_SQR)) {
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err = s_mp_sqr(a, b);
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} else {
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err = MP_VAL;
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}
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b->sign = MP_ZPOS;
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return err;
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}
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#endif
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