Mercurial > dropbear

annotate libtomcrypt/src/modes/ofb/ofb_encrypt.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
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_encrypt.c
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13 OFB implementation, encrypt data, Tom St Denis
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14 */
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16 #ifdef LTC_OFB_MODE
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18 /**
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19 OFB encrypt
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20 @param pt Plaintext
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21 @param ct [out] Ciphertext
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22 @param len Length of plaintext (octets)
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23 @param ofb OFB state
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24 @return CRYPT_OK if successful
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25 */
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26 int ofb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_OFB *ofb)
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27 {
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28 int err;
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29 LTC_ARGCHK(pt != NULL);
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30 LTC_ARGCHK(ct != NULL);
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31 LTC_ARGCHK(ofb != NULL);
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32 if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
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33 return err;
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34 }
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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35
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36 /* is blocklen/padlen valid? */
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37 if (ofb->blocklen < 0 || ofb->blocklen > (int)sizeof(ofb->IV) ||
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38 ofb->padlen < 0 || ofb->padlen > (int)sizeof(ofb->IV)) {
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39 return CRYPT_INVALID_ARG;
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40 }
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41
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42 while (len-- > 0) {
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43 if (ofb->padlen == ofb->blocklen) {
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44 if ((err = cipher_descriptor[ofb->cipher].ecb_encrypt(ofb->IV, ofb->IV, &ofb->key)) != CRYPT_OK) {
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45 return err;
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46 }
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47 ofb->padlen = 0;
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48 }
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49 *ct++ = *pt++ ^ ofb->IV[(ofb->padlen)++];
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50 }
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51 return CRYPT_OK;
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52 }
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53
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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: $Format:%ai$ */