Mercurial > dropbear

annotate libtommath/bn_mp_add.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +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
diff changeset
1 #include "tommath_private.h"
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2 #ifdef BN_MP_ADD_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 /* high level addition (handles signs) */
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7 mp_err mp_add(const mp_int *a, const mp_int *b, mp_int *c)
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8 {
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9 mp_sign sa, sb;
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10 mp_err err;
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11
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
diff changeset
12 /* get sign of both inputs */
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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13 sa = a->sign;
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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14 sb = b->sign;
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15
1655
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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16 /* handle two cases, not four */
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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17 if (sa == sb) {
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parents: 1470
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18 /* both positive or both negative */
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parents: 1470
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19 /* add their magnitudes, copy the sign */
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20 c->sign = sa;
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21 err = s_mp_add(a, b, c);
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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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22 } else {
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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23 /* one positive, the other negative */
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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24 /* subtract the one with the greater magnitude from */
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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25 /* the one of the lesser magnitude. The result gets */
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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26 /* the sign of the one with the greater magnitude. */
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parents: 1470
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27 if (mp_cmp_mag(a, b) == MP_LT) {
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parents: 1470
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28 c->sign = sb;
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29 err = s_mp_sub(b, a, c);
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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30 } else {
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parents: 1470
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31 c->sign = sa;
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32 err = s_mp_sub(a, b, c);
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parents: 1470
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33 }
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parents: 1470
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34 }
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35 return err;
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36 }
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parents:
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38 #endif