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annotate libtomcrypt/src/encauth/chachapoly/chacha20poly1305_done.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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1471
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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 Terminate a ChaCha20Poly1305 stream
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16 @param st The ChaCha20Poly1305 state
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17 @param tag [out] The destination for the MAC tag
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18 @param taglen [in/out] The length of the MAC tag
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19 @return CRYPT_OK on success
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20 */
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21 int chacha20poly1305_done(chacha20poly1305_state *st, unsigned char *tag, unsigned long *taglen)
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22 {
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23 unsigned char padzero[16] = { 0 };
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24 unsigned long padlen;
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25 unsigned char buf[16];
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26 int err;
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27
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28 LTC_ARGCHK(st != NULL);
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29
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30 padlen = 16 - (unsigned long)(st->ctlen % 16);
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31 if (padlen < 16) {
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32 if ((err = poly1305_process(&st->poly, padzero, padlen)) != CRYPT_OK) return err;
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33 }
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34 STORE64L(st->aadlen, buf);
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35 STORE64L(st->ctlen, buf + 8);
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36 if ((err = poly1305_process(&st->poly, buf, 16)) != CRYPT_OK) return err;
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37 if ((err = poly1305_done(&st->poly, tag, taglen)) != CRYPT_OK) return err;
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38 if ((err = chacha_done(&st->chacha)) != CRYPT_OK) return err;
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39 return CRYPT_OK;
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40 }
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41
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42 #endif
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43
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44 /* ref: $Format:%D$ */
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45 /* git commit: $Format:%H$ */
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46 /* commit time: $Format:%ai$ */