Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_decrypt.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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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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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46 /* ref: $Format:%D$ */
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47 /* git commit: $Format:%H$ */
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48 /* commit time: $Format:%ai$ */