Mercurial > dropbear

annotate libtomcrypt/src/mac/blake2/blake2bmac_memory.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:
rev   line source
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 #include "tomcrypt.h"
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11
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12 #ifdef LTC_BLAKE2BMAC
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13
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14 /**
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15 BLAKE2B MAC a block of memory to produce the authentication tag
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16 @param key The secret key
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17 @param keylen The length of the secret key (octets)
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18 @param in The data to BLAKE2B MAC
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19 @param inlen The length of the data to BLAKE2B MAC (octets)
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20 @param mac [out] Destination of the authentication tag
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21 @param maclen [in/out] Max size and resulting size of authentication tag
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22 @return CRYPT_OK if successful
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23 */
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24 int blake2bmac_memory(const unsigned char *key, unsigned long keylen, const unsigned char *in, unsigned long inlen, unsigned char *mac, unsigned long *maclen)
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25 {
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26 blake2bmac_state st;
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27 int err;
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28
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29 LTC_ARGCHK(key != NULL);
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30 LTC_ARGCHK(in != NULL);
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31 LTC_ARGCHK(mac != NULL);
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32 LTC_ARGCHK(maclen != NULL);
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33
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34 if ((err = blake2bmac_init(&st, *maclen, key, keylen)) != CRYPT_OK) { goto LBL_ERR; }
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35 if ((err = blake2bmac_process(&st, in, inlen)) != CRYPT_OK) { goto LBL_ERR; }
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36 err = blake2bmac_done(&st, mac, maclen);
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37 LBL_ERR:
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38 #ifdef LTC_CLEAN_STACK
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39 zeromem(&st, sizeof(blake2bmac_state));
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40 #endif
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41 return err;
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42 }
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43
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44 #endif
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45
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46 /* ref: $Format:%D$ */
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47 /* git commit: $Format:%H$ */
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48 /* commit time: $Format:%ai$ */