Mercurial > dropbear

annotate libtomcrypt/src/stream/chacha/chacha_ivctr64.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 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9
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10 /* The implementation is based on:
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11 * chacha-ref.c version 20080118
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12 * Public domain from D. J. Bernstein
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13 */
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14
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15 #include "tomcrypt.h"
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16
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17 #ifdef LTC_CHACHA
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18
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19 /**
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20 Set IV + counter data to the ChaCha state
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21 @param st The ChaCha20 state
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22 @param iv The IV data to add
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23 @param ivlen The length of the IV (must be 8)
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24 @param counter 64bit (unsigned) initial counter value
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25 @return CRYPT_OK on success
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26 */
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27 int chacha_ivctr64(chacha_state *st, const unsigned char *iv, unsigned long ivlen, ulong64 counter)
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28 {
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29 LTC_ARGCHK(st != NULL);
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30 LTC_ARGCHK(iv != NULL);
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31 /* 64bit IV + 64bit counter */
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32 LTC_ARGCHK(ivlen == 8);
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33
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34 st->input[12] = (ulong32)(counter & 0xFFFFFFFF);
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35 st->input[13] = (ulong32)(counter >> 32);
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36 LOAD32L(st->input[14], iv + 0);
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37 LOAD32L(st->input[15], iv + 4);
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38 st->ksleft = 0;
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39 st->ivlen = ivlen;
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40 return CRYPT_OK;
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41 }
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42
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43 #endif
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44
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45 /* ref: $Format:%D$ */
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46 /* git commit: $Format:%H$ */
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47 /* commit time: $Format:%ai$ */