Mercurial > dropbear

annotate libtomcrypt/src/modes/ofb/ofb_start.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
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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 #include "tomcrypt.h"
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11 /**
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12 @file ofb_start.c
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13 OFB implementation, start chain, Tom St Denis
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14 */
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17 #ifdef LTC_OFB_MODE
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19 /**
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20 Initialize a OFB context
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21 @param cipher The index of the cipher desired
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22 @param IV The initialization vector
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23 @param key The secret key
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24 @param keylen The length of the secret key (octets)
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25 @param num_rounds Number of rounds in the cipher desired (0 for default)
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26 @param ofb The OFB state to initialize
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27 @return CRYPT_OK if successful
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28 */
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29 int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key,
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30 int keylen, int num_rounds, symmetric_OFB *ofb)
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31 {
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32 int x, err;
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34 LTC_ARGCHK(IV != NULL);
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35 LTC_ARGCHK(key != NULL);
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36 LTC_ARGCHK(ofb != NULL);
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38 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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39 return err;
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40 }
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42 /* copy details */
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43 ofb->cipher = cipher;
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44 ofb->blocklen = cipher_descriptor[cipher].block_length;
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45 for (x = 0; x < ofb->blocklen; x++) {
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46 ofb->IV[x] = IV[x];
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47 }
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49 /* init the cipher */
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50 ofb->padlen = ofb->blocklen;
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51 return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ofb->key);
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52 }
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54 #endif
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55
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56 /* ref: $Format:%D$ */
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57 /* git commit: $Format:%H$ */
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58 /* commit time: $Format:%ai$ */