Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_process.c @ 1422:4cebe907dfd0

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limit input size
author Matt Johnston <matt@ucc.asn.au>
date Thu, 25 May 2017 22:21:23 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 omac_process.c
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15 OMAC1 support, process data, Tom St Denis
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16 */
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17
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18
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19 #ifdef LTC_OMAC
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20
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21 /**
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22 Process data through OMAC
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23 @param omac The OMAC state
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24 @param in The input data to send through OMAC
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25 @param inlen The length of the input (octets)
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26 @return CRYPT_OK if successful
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27 */
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28 int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen)
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29 {
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30 unsigned long n, x;
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31 int err;
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32
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33 LTC_ARGCHK(omac != NULL);
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34 LTC_ARGCHK(in != NULL);
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35 if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) {
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36 return err;
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37 }
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38
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39 if ((omac->buflen > (int)sizeof(omac->block)) || (omac->buflen < 0) ||
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40 (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) {
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41 return CRYPT_INVALID_ARG;
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42 }
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43
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44 #ifdef LTC_FAST
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45 if (omac->buflen == 0 && inlen > 16) {
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46 int y;
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47 for (x = 0; x < (inlen - 16); x += 16) {
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48 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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49 *((LTC_FAST_TYPE*)(&omac->prev[y])) ^= *((LTC_FAST_TYPE*)(&in[y]));
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50 }
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51 in += 16;
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52 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->prev, omac->prev, &omac->key)) != CRYPT_OK) {
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53 return err;
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54 }
285
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55 }
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56 inlen -= x;
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57 }
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58 #endif
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59
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60 while (inlen != 0) {
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61 /* ok if the block is full we xor in prev, encrypt and replace prev */
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62 if (omac->buflen == omac->blklen) {
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63 for (x = 0; x < (unsigned long)omac->blklen; x++) {
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64 omac->block[x] ^= omac->prev[x];
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65 }
382
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66 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->block, omac->prev, &omac->key)) != CRYPT_OK) {
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67 return err;
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68 }
285
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69 omac->buflen = 0;
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70 }
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71
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72 /* add bytes */
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73 n = MIN(inlen, (unsigned long)(omac->blklen - omac->buflen));
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74 XMEMCPY(omac->block + omac->buflen, in, n);
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75 omac->buflen += n;
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76 inlen -= n;
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77 in += n;
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78 }
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79
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80 return CRYPT_OK;
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81 }
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82
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83 #endif
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84
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85
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86 /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_process.c,v $ */
382
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87 /* $Revision: 1.9 $ */
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parents: 285
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88 /* $Date: 2006/11/03 00:39:49 $ */