Mercurial > dropbear

annotate libtommath/bn_s_mp_rand_jenkins.c @ 1737:8b27de2c92ee

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Change secure.ucc.asn.au/hg to hg.ucc.asn.au
author Matt Johnston <matt@ucc.asn.au>
date Tue, 28 Jul 2020 18:53:48 +0800
parents 1051e4eea25a
children
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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