Mercurial > dropbear

annotate libtommath/bn_mp_invmod.c @ 1702:8f93f37c01de

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Allow DH to be completely disabled (#97) Reduces binary size by ~2kB by default and by 21kB with no other libtommath functions users, ex. with curve25519 kex and ed25519 key only.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Thu, 28 May 2020 20:01:48 +0500
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_INVMOD_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 /* hac 14.61, pp608 */
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7 mp_err mp_invmod(const mp_int *a, const mp_int *b, mp_int *c)
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8 {
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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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9 /* b cannot be negative and has to be >1 */
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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10 if ((b->sign == MP_NEG) || (mp_cmp_d(b, 1uL) != MP_GT)) {
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parents: 1470
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11 return MP_VAL;
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parents: 1470
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12 }
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13
1655
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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14 /* if the modulus is odd we can use a faster routine instead */
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15 if (MP_HAS(S_MP_INVMOD_FAST) && MP_IS_ODD(b)) {
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16 return s_mp_invmod_fast(a, b, c);
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parents: 1470
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17 }
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18
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19 return MP_HAS(S_MP_INVMOD_SLOW)
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20 ? s_mp_invmod_slow(a, b, c)
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21 : MP_VAL;
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22 }
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23 #endif