Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_process.c @ 315:3eea61bd9993

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 27 Mar 2006 15:13:48 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
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rev   line source
285
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diff changeset
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.org
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10 */
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11 #include "tomcrypt.h"
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12
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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18
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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19 #ifdef PMAC
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20
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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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 cipher_descriptor[pmac->cipher_idx].ecb_encrypt(Z, Z, &pmac->key);
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54 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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55 *((LTC_FAST_TYPE*)(&pmac->checksum[y])) ^= *((LTC_FAST_TYPE*)(&Z[y]));
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56 }
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57 in += 16;
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58 }
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59 inlen -= x;
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60 }
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61 #endif
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62
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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63 while (inlen != 0) {
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64 /* ok if the block is full we xor in prev, encrypt and replace prev */
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65 if (pmac->buflen == pmac->block_len) {
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66 pmac_shift_xor(pmac);
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67 for (x = 0; x < (unsigned long)pmac->block_len; x++) {
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68 Z[x] = pmac->Li[x] ^ pmac->block[x];
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69 }
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70 cipher_descriptor[pmac->cipher_idx].ecb_encrypt(Z, Z, &pmac->key);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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71 for (x = 0; x < (unsigned long)pmac->block_len; x++) {
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72 pmac->checksum[x] ^= Z[x];
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73 }
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74 pmac->buflen = 0;
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75 }
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76
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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77 /* add bytes */
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78 n = MIN(inlen, (unsigned long)(pmac->block_len - pmac->buflen));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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79 XMEMCPY(pmac->block + pmac->buflen, in, n);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
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80 pmac->buflen += n;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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81 inlen -= n;
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82 in += n;
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83 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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84
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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85 #ifdef LTC_CLEAN_STACK
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86 zeromem(Z, sizeof(Z));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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87 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_process.c,v $ */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 /* $Revision: 1.5 $ */
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 /* $Date: 2005/05/05 14:35:59 $ */