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annotate libtommath/bn_mp_rand.c @ 1786:a3b39df57c8b

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fuzz: add an always-failing dropbear_listen() replacement
author Matt Johnston <matt@ucc.asn.au>
date Sun, 06 Dec 2020 21:54:01 +0800
parents 34d9d3c022ce
children
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_RAND_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 /* Dropbear sets this separately, avoid platform code */
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7 mp_err(*s_mp_rand_source)(void *out, size_t size) = NULL;
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9 void mp_rand_source(mp_err(*source)(void *out, size_t size))
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10 {
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11 /* Dropbear, don't reset to platform if source==NULL */
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12 s_mp_rand_source = source;
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13 }
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14
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15 mp_err mp_rand(mp_int *a, int digits)
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16 {
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17 int i;
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18 mp_err err;
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20 mp_zero(a);
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22 if (digits <= 0) {
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23 return MP_OKAY;
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24 }
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26 if ((err = mp_grow(a, digits)) != MP_OKAY) {
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27 return err;
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28 }
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30 if ((err = s_mp_rand_source(a->dp, (size_t)digits * sizeof(mp_digit))) != MP_OKAY) {
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31 return err;
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32 }
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33
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34 /* TODO: We ensure that the highest digit is nonzero. Should this be removed? */
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35 while ((a->dp[digits - 1] & MP_MASK) == 0u) {
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36 if ((err = s_mp_rand_source(a->dp + digits - 1, sizeof(mp_digit))) != MP_OKAY) {
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37 return err;
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38 }
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39 }
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40
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41 a->used = digits;
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42 for (i = 0; i < digits; ++i) {
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43 a->dp[i] &= MP_MASK;
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44 }
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46 return MP_OKAY;
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47 }
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48 #endif