Mercurial > dropbear

annotate libtommath/bn_mp_mulmod.c @ 1754:064f5be2fc45

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Add buf_decrpos()
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Oct 2020 18:56:45 +0800
parents 1051e4eea25a
children
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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_MULMOD_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 /* d = a * b (mod c) */
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7 mp_err mp_mulmod(const mp_int *a, const mp_int *b, const mp_int *c, mp_int *d)
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8 {
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9 mp_err err;
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10 mp_int t;
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11
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12 if ((err = mp_init_size(&t, c->used)) != MP_OKAY) {
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13 return err;
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parents: 1470
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14 }
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15
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16 if ((err = mp_mul(a, b, &t)) != MP_OKAY) {
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17 goto LBL_ERR;
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parents: 1470
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18 }
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19 err = mp_mod(&t, c, d);
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20
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21 LBL_ERR:
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22 mp_clear(&t);
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23 return err;
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24 }
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25 #endif