Mercurial > dropbear

annotate libtommath/bn_s_mp_rand_jenkins.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1692
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1 #include "tommath_private.h"
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2 #ifdef BN_S_MP_RAND_JENKINS_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 /* Bob Jenkins' http://burtleburtle.net/bob/rand/smallprng.html */
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7 /* Chosen for speed and a good "mix" */
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8 typedef struct {
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9 uint64_t a;
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10 uint64_t b;
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11 uint64_t c;
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12 uint64_t d;
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13 } ranctx;
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14
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15 static ranctx jenkins_x;
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16
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17 #define rot(x,k) (((x)<<(k))|((x)>>(64-(k))))
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18 static uint64_t s_rand_jenkins_val(void)
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19 {
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20 uint64_t e = jenkins_x.a - rot(jenkins_x.b, 7);
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21 jenkins_x.a = jenkins_x.b ^ rot(jenkins_x.c, 13);
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22 jenkins_x.b = jenkins_x.c + rot(jenkins_x.d, 37);
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23 jenkins_x.c = jenkins_x.d + e;
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24 jenkins_x.d = e + jenkins_x.a;
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25 return jenkins_x.d;
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26 }
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27
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28 void s_mp_rand_jenkins_init(uint64_t seed)
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29 {
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30 uint64_t i;
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31 jenkins_x.a = 0xf1ea5eedULL;
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32 jenkins_x.b = jenkins_x.c = jenkins_x.d = seed;
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33 for (i = 0uLL; i < 20uLL; ++i) {
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34 (void)s_rand_jenkins_val();
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35 }
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36 }
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37
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38 mp_err s_mp_rand_jenkins(void *p, size_t n)
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39 {
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40 char *q = (char *)p;
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41 while (n > 0u) {
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42 int i;
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43 uint64_t x = s_rand_jenkins_val();
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44 for (i = 0; (i < 8) && (n > 0u); ++i, --n) {
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45 *q++ = (char)(x & 0xFFuLL);
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46 x >>= 8;
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47 }
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48 }
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49 return MP_OKAY;
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50 }
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51
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52 #endif