Mercurial > dropbear

annotate libtommath/bn_mp_sub.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents 1051e4eea25a
children
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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
1 #include "tommath_private.h"
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2 #ifdef BN_MP_SUB_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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4 /* SPDX-License-Identifier: Unlicense */
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6 /* high level subtraction (handles signs) */
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7 mp_err mp_sub(const mp_int *a, const mp_int *b, mp_int *c)
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8 {
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parents: 1655
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9 mp_sign sa = a->sign, sb = b->sign;
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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
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12 if (sa != sb) {
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 /* subtract a negative from a positive, OR */
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 /* subtract a positive from a 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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15 /* In either case, ADD their magnitudes, */
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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16 /* and use the sign of the first number. */
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17 c->sign = sa;
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18 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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19 } 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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20 /* subtract a positive from a positive, OR */
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
21 /* subtract a negative from a 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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22 /* First, take the difference between their */
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 /* magnitudes, then... */
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 if (mp_cmp_mag(a, b) != MP_LT) {
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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25 /* Copy the sign from the first */
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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26 c->sign = sa;
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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27 /* The first has a larger or equal magnitude */
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parents: 1655
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28 err = s_mp_sub(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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29 } else {
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
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30 /* The result has the *opposite* sign from */
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 /* the first number. */
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parents: 1470
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32 c->sign = (sa == MP_ZPOS) ? MP_NEG : MP_ZPOS;
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parents: 1470
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33 /* The second has a larger magnitude */
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parents: 1655
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34 err = s_mp_sub(b, a, c);
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Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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35 }
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parents: 1470
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36 }
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37 return err;
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parents:
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38 }
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parents:
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40 #endif