Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_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
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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 omac_done.c
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13 OMAC1 support, terminate a stream, Tom St Denis
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14 */
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16 #ifdef LTC_OMAC
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18 /**
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19 Terminate an OMAC stream
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20 @param omac The OMAC state
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21 @param out [out] Destination for the authentication tag
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22 @param outlen [in/out] The max size and resulting size of the authentication tag
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23 @return CRYPT_OK if successful
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24 */
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25 int omac_done(omac_state *omac, unsigned char *out, unsigned long *outlen)
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26 {
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27 int err, mode;
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28 unsigned x;
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30 LTC_ARGCHK(omac != NULL);
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31 LTC_ARGCHK(out != NULL);
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32 LTC_ARGCHK(outlen != NULL);
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33 if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) {
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34 return err;
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35 }
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37 if ((omac->buflen > (int)sizeof(omac->block)) || (omac->buflen < 0) ||
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38 (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) {
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39 return CRYPT_INVALID_ARG;
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40 }
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42 /* figure out mode */
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43 if (omac->buflen != omac->blklen) {
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44 /* add the 0x80 byte */
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45 omac->block[omac->buflen++] = 0x80;
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47 /* pad with 0x00 */
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48 while (omac->buflen < omac->blklen) {
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49 omac->block[omac->buflen++] = 0x00;
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50 }
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51 mode = 1;
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52 } else {
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53 mode = 0;
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54 }
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56 /* now xor prev + Lu[mode] */
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57 for (x = 0; x < (unsigned)omac->blklen; x++) {
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58 omac->block[x] ^= omac->prev[x] ^ omac->Lu[mode][x];
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59 }
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61 /* encrypt it */
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62 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->block, omac->block, &omac->key)) != CRYPT_OK) {
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63 return err;
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64 }
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65 cipher_descriptor[omac->cipher_idx].done(&omac->key);
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66
285
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67 /* output it */
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68 for (x = 0; x < (unsigned)omac->blklen && x < *outlen; x++) {
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69 out[x] = omac->block[x];
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70 }
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71 *outlen = x;
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72
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73 #ifdef LTC_CLEAN_STACK
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74 zeromem(omac, sizeof(*omac));
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75 #endif
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76 return CRYPT_OK;
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77 }
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78
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79 #endif
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81
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82 /* ref: $Format:%D$ */
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83 /* git commit: $Format:%H$ */
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84 /* commit time: $Format:%ai$ */