Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_process.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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11 /**
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12 @file pmac_process.c
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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13 PMAC implementation, process data, by Tom St Denis
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14 */
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16
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17 #ifdef LTC_PMAC
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19 /**
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20 Process data in a PMAC stream
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21 @param pmac The PMAC state
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22 @param in The data to send through PMAC
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23 @param inlen The length of the data to send through PMAC
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24 @return CRYPT_OK if successful
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25 */
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26 int pmac_process(pmac_state *pmac, const unsigned char *in, unsigned long inlen)
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27 {
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28 int err, n;
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29 unsigned long x;
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30 unsigned char Z[MAXBLOCKSIZE];
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31
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32 LTC_ARGCHK(pmac != NULL);
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33 LTC_ARGCHK(in != NULL);
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34 if ((err = cipher_is_valid(pmac->cipher_idx)) != CRYPT_OK) {
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35 return err;
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36 }
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37
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38 if ((pmac->buflen > (int)sizeof(pmac->block)) || (pmac->buflen < 0) ||
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39 (pmac->block_len > (int)sizeof(pmac->block)) || (pmac->buflen > pmac->block_len)) {
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40 return CRYPT_INVALID_ARG;
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41 }
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42
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43 #ifdef LTC_FAST
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44 if (pmac->buflen == 0 && inlen > 16) {
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45 unsigned long y;
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46 for (x = 0; x < (inlen - 16); x += 16) {
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47 pmac_shift_xor(pmac);
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48 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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49 *(LTC_FAST_TYPE_PTR_CAST(&Z[y])) = *(LTC_FAST_TYPE_PTR_CAST(&in[y])) ^ *(LTC_FAST_TYPE_PTR_CAST(&pmac->Li[y]));
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50 }
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51 if ((err = cipher_descriptor[pmac->cipher_idx].ecb_encrypt(Z, Z, &pmac->key)) != CRYPT_OK) {
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52 return err;
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53 }
285
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54 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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55 *(LTC_FAST_TYPE_PTR_CAST(&pmac->checksum[y])) ^= *(LTC_FAST_TYPE_PTR_CAST(&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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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63 while (inlen != 0) {
285
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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 }
382
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70 if ((err = cipher_descriptor[pmac->cipher_idx].ecb_encrypt(Z, Z, &pmac->key)) != CRYPT_OK) {
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71 return err;
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72 }
285
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73 for (x = 0; x < (unsigned long)pmac->block_len; x++) {
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74 pmac->checksum[x] ^= Z[x];
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75 }
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76 pmac->buflen = 0;
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77 }
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78
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79 /* add bytes */
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80 n = MIN(inlen, (unsigned long)(pmac->block_len - pmac->buflen));
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81 XMEMCPY(pmac->block + pmac->buflen, in, n);
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82 pmac->buflen += n;
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83 inlen -= n;
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84 in += n;
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85 }
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86
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87 #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
88 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
89 #endif
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 return CRYPT_OK;
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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
96 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
97 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
98 /* commit time: $Format:%ai$ */