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annotate libtommath/bn_mp_reduce_setup.c @ 1680:5e763ad6e2e0

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author Matt Johnston <matt@ucc.asn.au>
date Sun, 24 May 2020 13:34:19 +0800
parents f52919ffd3b1
children 1051e4eea25a
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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_REDUCE_SETUP_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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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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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* pre-calculate the value required for Barrett reduction
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16 * For a given modulus "b" it calulates the value required in "a"
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17 */
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parents: 1470
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18 int mp_reduce_setup(mp_int *a, const mp_int *b)
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19 {
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parents: 1470
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20 int res;
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parents: 1470
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21
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parents: 1470
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22 if ((res = mp_2expt(a, b->used * 2 * DIGIT_BIT)) != MP_OKAY) {
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parents: 1470
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23 return res;
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parents: 1470
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24 }
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parents: 1470
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25 return mp_div(a, b, a, NULL);
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26 }
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27 #endif
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28
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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29 /* ref: HEAD -> master, tag: v1.1.0 */
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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30 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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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31 /* commit time: 2019-01-28 20:32:32 +0100 */