Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_process.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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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;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 in += n;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 }
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 #ifdef LTC_CLEAN_STACK
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 zeromem(Z, sizeof(Z));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
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
diff changeset
99 /* $Revision: 1.8 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
100 /* $Date: 2006/11/03 00:39:49 $ */