Mercurial > dropbear

annotate libtommath/bn_mp_sqr.c @ 1843:03dfecca99bd

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 18 Oct 2021 23:25:20 +0800
parents 1051e4eea25a
children
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1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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1 #include "tommath_private.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 /* SPDX-License-Identifier: Unlicense */
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6 /* computes b = a*a */
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7 mp_err mp_sqr(const mp_int *a, mp_int *b)
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8 {
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9 mp_err err;
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10 if (MP_HAS(S_MP_TOOM_SQR) && /* use Toom-Cook? */
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11 (a->used >= MP_TOOM_SQR_CUTOFF)) {
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12 err = s_mp_toom_sqr(a, b);
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13 } else if (MP_HAS(S_MP_KARATSUBA_SQR) && /* Karatsuba? */
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14 (a->used >= MP_KARATSUBA_SQR_CUTOFF)) {
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15 err = s_mp_karatsuba_sqr(a, b);
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16 } else if (MP_HAS(S_MP_SQR_FAST) && /* can we use the fast comba multiplier? */
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17 (((a->used * 2) + 1) < MP_WARRAY) &&
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18 (a->used < (MP_MAXFAST / 2))) {
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19 err = s_mp_sqr_fast(a, b);
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20 } else if (MP_HAS(S_MP_SQR)) {
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21 err = s_mp_sqr(a, b);
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22 } else {
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23 err = MP_VAL;
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24 }
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parents: 1470
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25 b->sign = MP_ZPOS;
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26 return err;
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27 }
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28 #endif