Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_process.c @ 906:4696755c4cac

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A few fixes for cases where compression increases payload sizes, and be more precise about maximum channel sizes
author Matt Johnston <matt@ucc.asn.au>
date Sat, 22 Feb 2014 18:02:09 +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 pmac_process.c
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15 PMAC implementation, process data, by 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_PMAC
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20
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21 /**
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22 Process data in a PMAC stream
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23 @param pmac The PMAC state
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24 @param in The data to send through PMAC
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25 @param inlen The length of the data to send through PMAC
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26 @return CRYPT_OK if successful
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27 */
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28 int pmac_process(pmac_state *pmac, const unsigned char *in, unsigned long inlen)
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29 {
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30 int err, n;
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31 unsigned long x;
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32 unsigned char Z[MAXBLOCKSIZE];
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33
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34 LTC_ARGCHK(pmac != NULL);
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35 LTC_ARGCHK(in != NULL);
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36 if ((err = cipher_is_valid(pmac->cipher_idx)) != CRYPT_OK) {
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37 return err;
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38 }
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39
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40 if ((pmac->buflen > (int)sizeof(pmac->block)) || (pmac->buflen < 0) ||
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41 (pmac->block_len > (int)sizeof(pmac->block)) || (pmac->buflen > pmac->block_len)) {
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42 return CRYPT_INVALID_ARG;
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43 }
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44
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45 #ifdef LTC_FAST
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46 if (pmac->buflen == 0 && inlen > 16) {
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47 unsigned long y;
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48 for (x = 0; x < (inlen - 16); x += 16) {
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49 pmac_shift_xor(pmac);
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50 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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51 *((LTC_FAST_TYPE*)(&Z[y])) = *((LTC_FAST_TYPE*)(&in[y])) ^ *((LTC_FAST_TYPE*)(&pmac->Li[y]));
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52 }
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53 if ((err = cipher_descriptor[pmac->cipher_idx].ecb_encrypt(Z, Z, &pmac->key)) != CRYPT_OK) {
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54 return err;
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55 }
285
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56 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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57 *((LTC_FAST_TYPE*)(&pmac->checksum[y])) ^= *((LTC_FAST_TYPE*)(&Z[y]));
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58 }
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59 in += 16;
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60 }
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61 inlen -= x;
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62 }
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63 #endif
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64
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65 while (inlen != 0) {
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66 /* ok if the block is full we xor in prev, encrypt and replace prev */
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67 if (pmac->buflen == pmac->block_len) {
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68 pmac_shift_xor(pmac);
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69 for (x = 0; x < (unsigned long)pmac->block_len; x++) {
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70 Z[x] = pmac->Li[x] ^ pmac->block[x];
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71 }
382
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72 if ((err = cipher_descriptor[pmac->cipher_idx].ecb_encrypt(Z, Z, &pmac->key)) != CRYPT_OK) {
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73 return err;
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74 }
285
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75 for (x = 0; x < (unsigned long)pmac->block_len; x++) {
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76 pmac->checksum[x] ^= Z[x];
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77 }
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78 pmac->buflen = 0;
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79 }
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80
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81 /* add bytes */
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82 n = MIN(inlen, (unsigned long)(pmac->block_len - pmac->buflen));
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83 XMEMCPY(pmac->block + pmac->buflen, in, n);
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84 pmac->buflen += n;
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85 inlen -= n;
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86 in += n;
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87 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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88
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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89 #ifdef LTC_CLEAN_STACK
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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90 zeromem(Z, sizeof(Z));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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91 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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92
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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93 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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94 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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96 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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97
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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98 /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_process.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
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99 /* $Revision: 1.8 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
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100 /* $Date: 2006/11/03 00:39:49 $ */