Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_process.c @ 476:df7f7da7f6e4 pubkey-options

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- Rework pubkey options to be more careful about buffer lengths. Needs review.
author Matt Johnston <matt@ucc.asn.au>
date Fri, 12 Sep 2008 17:23:56 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file xcbc_process.c
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15 XCBC Support, process blocks with XCBC
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16 */
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17
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18 #ifdef LTC_XCBC
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19
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20 /** Process data through XCBC-MAC
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21 @param xcbc The XCBC-MAC state
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22 @param in Input data to process
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23 @param inlen Length of input in octets
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24 Return CRYPT_OK on success
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25 */
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26 int xcbc_process(xcbc_state *xcbc, const unsigned char *in, unsigned long inlen)
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27 {
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28 int err;
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29 #ifdef LTC_FAST
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30 int x;
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31 #endif
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32
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33 LTC_ARGCHK(xcbc != NULL);
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34 LTC_ARGCHK(in != NULL);
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35
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36 /* check structure */
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37 if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) {
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38 return err;
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39 }
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40
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41 if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) ||
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42 (xcbc->buflen > xcbc->blocksize) || (xcbc->buflen < 0)) {
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43 return CRYPT_INVALID_ARG;
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44 }
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45
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46 #ifdef LTC_FAST
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47 if (xcbc->buflen == 0) {
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48 while (inlen > (unsigned long)xcbc->blocksize) {
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49 for (x = 0; x < xcbc->blocksize; x += sizeof(LTC_FAST_TYPE)) {
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50 *((LTC_FAST_TYPE*)&(xcbc->IV[x])) ^= *((LTC_FAST_TYPE*)&(in[x]));
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51 }
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52 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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53 in += xcbc->blocksize;
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54 inlen -= xcbc->blocksize;
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55 }
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56 }
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57 #endif
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58
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59 while (inlen) {
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60 if (xcbc->buflen == xcbc->blocksize) {
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61 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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62 xcbc->buflen = 0;
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63 }
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64 xcbc->IV[xcbc->buflen++] ^= *in++;
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65 --inlen;
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66 }
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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
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72 /* $Source: /cvs/libtom/libtomcrypt/src/mac/xcbc/xcbc_process.c,v $ */
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73 /* $Revision: 1.9 $ */
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74 /* $Date: 2006/11/09 22:43:52 $ */
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75