Mercurial > dropbear

annotate libtommath/bn_mp_rand.c @ 1705:5b701bf529aa

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Fix ChaCha20 on 32-bit platforms (#99) * Fix ChaCha20 on 32-bit platforms On 32-bit platforms with old compiler STORE64H() parameter is not auto-expanded to 64-bit value, causing wrong IV data. Spotted on BCM4706 MIPS32r2 with GCC 4.2.4: Exit before auth: Integrity error (bad packet size 2065808956) * Fix Chacha20-Poly1305 and AES-GCM debug messages Functions were renamed earlier and trace messages - not.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Fri, 29 May 2020 18:26:22 +0500
parents 1051e4eea25a
children 34d9d3c022ce
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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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6 mp_err(*s_mp_rand_source)(void *out, size_t size) = s_mp_rand_platform;
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8 void mp_rand_source(mp_err(*source)(void *out, size_t size))
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9 {
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10 s_mp_rand_source = (source == NULL) ? s_mp_rand_platform : source;
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11 }
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12
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13 mp_err mp_rand(mp_int *a, int digits)
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14 {
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15 int i;
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16 mp_err err;
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18 mp_zero(a);
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20 if (digits <= 0) {
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21 return MP_OKAY;
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22 }
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24 if ((err = mp_grow(a, digits)) != MP_OKAY) {
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25 return err;
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26 }
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28 if ((err = s_mp_rand_source(a->dp, (size_t)digits * sizeof(mp_digit))) != MP_OKAY) {
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29 return err;
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30 }
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31
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32 /* TODO: We ensure that the highest digit is nonzero. Should this be removed? */
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33 while ((a->dp[digits - 1] & MP_MASK) == 0u) {
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34 if ((err = s_mp_rand_source(a->dp + digits - 1, sizeof(mp_digit))) != MP_OKAY) {
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35 return err;
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36 }
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37 }
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38
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39 a->used = digits;
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40 for (i = 0; i < digits; ++i) {
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41 a->dp[i] &= MP_MASK;
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42 }
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44 return MP_OKAY;
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45 }
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46 #endif