Mercurial > dropbear

annotate libtomcrypt/src/mac/f9/f9_done.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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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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10
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11 /**
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12 @file f9_done.c
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13 f9 Support, terminate the state
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14 */
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15
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16 #ifdef LTC_F9_MODE
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17
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18 /** Terminate the f9-MAC state
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19 @param f9 f9 state to terminate
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20 @param out [out] Destination for the MAC tag
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21 @param outlen [in/out] Destination size and final tag size
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22 Return CRYPT_OK on success
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23 */
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24 int f9_done(f9_state *f9, unsigned char *out, unsigned long *outlen)
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25 {
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26 int err, x;
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27 LTC_ARGCHK(f9 != NULL);
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28 LTC_ARGCHK(out != NULL);
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29
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30 /* check structure */
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31 if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) {
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32 return err;
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33 }
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34
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35 if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) ||
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36 (f9->buflen > f9->blocksize) || (f9->buflen < 0)) {
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37 return CRYPT_INVALID_ARG;
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38 }
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39
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40 if (f9->buflen != 0) {
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41 /* encrypt */
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42 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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43 f9->buflen = 0;
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44 for (x = 0; x < f9->blocksize; x++) {
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45 f9->ACC[x] ^= f9->IV[x];
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46 }
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47 }
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48
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49 /* schedule modified key */
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50 if ((err = cipher_descriptor[f9->cipher].setup(f9->akey, f9->keylen, 0, &f9->key)) != CRYPT_OK) {
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51 return err;
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52 }
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53
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54 /* encrypt the ACC */
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55 cipher_descriptor[f9->cipher].ecb_encrypt(f9->ACC, f9->ACC, &f9->key);
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56 cipher_descriptor[f9->cipher].done(&f9->key);
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57
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58 /* extract tag */
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59 for (x = 0; x < f9->blocksize && (unsigned long)x < *outlen; x++) {
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60 out[x] = f9->ACC[x];
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61 }
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62 *outlen = x;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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63
382
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(f9, sizeof(*f9));
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66 #endif
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67 return CRYPT_OK;
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68 }
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69
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70 #endif
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71
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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72 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 /* commit time: $Format:%ai$ */
382
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75