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annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_setiv_rfc7905.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
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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_CHACHA20POLY1305_MODE
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13
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14 /**
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15 Set IV + counter data (with RFC7905-magic) to the ChaCha20Poly1305 state and reset the context
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16 @param st The ChaCha20Poly1305 state
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17 @param iv The IV data to add
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18 @param ivlen The length of the IV (must be 12 or 8)
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19 @param sequence_number 64bit sequence number which is incorporated into IV as described in RFC7905
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20 @return CRYPT_OK on success
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21 */
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22 int chacha20poly1305_setiv_rfc7905(chacha20poly1305_state *st, const unsigned char *iv, unsigned long ivlen, ulong64 sequence_number)
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23 {
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24 int i;
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25 unsigned char combined_iv[12] = { 0 };
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26
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27 LTC_ARGCHK(st != NULL);
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28 LTC_ARGCHK(iv != NULL);
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29 LTC_ARGCHK(ivlen == 12);
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30
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31 STORE64L(sequence_number, combined_iv + 4);
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32 for (i = 0; i < 12; i++) combined_iv[i] = iv[i] ^ combined_iv[i];
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33 return chacha20poly1305_setiv(st, combined_iv, 12);
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34 }
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35
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36 #endif
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37
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38 /* ref: $Format:%D$ */
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39 /* git commit: $Format:%H$ */
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40 /* commit time: $Format:%ai$ */