Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_decrypt.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 /**
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11 @file eax_decrypt.c
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12 EAX implementation, decrypt block, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_EAX_MODE
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18 /**
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19 Decrypt data with the EAX protocol
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20 @param eax The EAX state
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21 @param ct The ciphertext
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22 @param pt [out] The plaintext
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23 @param length The length (octets) of the ciphertext
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24 @return CRYPT_OK if successful
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25 */
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26 int eax_decrypt(eax_state *eax, const unsigned char *ct, unsigned char *pt,
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27 unsigned long length)
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28 {
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29 int err;
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31 LTC_ARGCHK(eax != NULL);
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32 LTC_ARGCHK(pt != NULL);
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33 LTC_ARGCHK(ct != NULL);
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35 /* omac ciphertext */
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36 if ((err = omac_process(&eax->ctomac, ct, length)) != CRYPT_OK) {
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37 return err;
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38 }
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40 /* decrypt */
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41 return ctr_decrypt(ct, pt, length, &eax->ctr);
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42 }
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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: $Format:%ai$ */