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annotate libtommath/bn_mp_reduce_2k_setup.c @ 1830:c32976db772f

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Merge
author Matt Johnston <matt@ucc.asn.au>
date Mon, 11 Oct 2021 15:46:49 +0800
parents 1051e4eea25a
children
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_REDUCE_2K_SETUP_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 /* determines the setup value */
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7 mp_err mp_reduce_2k_setup(const mp_int *a, mp_digit *d)
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8 {
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9 mp_err err;
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10 mp_int tmp;
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11 int p;
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12
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13 if ((err = mp_init(&tmp)) != MP_OKAY) {
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14 return err;
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15 }
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16
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17 p = mp_count_bits(a);
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18 if ((err = mp_2expt(&tmp, p)) != MP_OKAY) {
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19 mp_clear(&tmp);
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20 return err;
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21 }
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22
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23 if ((err = s_mp_sub(&tmp, a, &tmp)) != MP_OKAY) {
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24 mp_clear(&tmp);
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25 return err;
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26 }
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27
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28 *d = tmp.dp[0];
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29 mp_clear(&tmp);
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30 return MP_OKAY;
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31 }
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32 #endif