Mercurial > dropbear
annotate libtommath/bn_s_mp_rand_jenkins.c @ 1793:f90e681b8b8c
merge
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 29 Jan 2021 21:59:12 +0800 |
parents | 1051e4eea25a |
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rev | line source |
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Update LibTomMath to 1.2.0 (#84)
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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 |