annotate libtommath/bn_mp_reduce_setup.c @ 1853:2be3115a8762 default tip main master

debugging test runner authorized_keys perms
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 Oct 2021 13:45:59 +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_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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5
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6 /* pre-calculate the value required for Barrett reduction
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7 * For a given modulus "b" it calulates the value required in "a"
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8 */
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9 mp_err mp_reduce_setup(mp_int *a, const mp_int *b)
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10 {
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11 mp_err err;
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12 if ((err = mp_2expt(a, b->used * 2 * MP_DIGIT_BIT)) != MP_OKAY) {
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13 return err;
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14 }
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15 return mp_div(a, b, a, NULL);
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16 }
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17 #endif