Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_done.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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10 /**
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11 @file eax_done.c
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12 EAX implementation, terminate session, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_EAX_MODE
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17
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18 /**
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19 Terminate an EAX session and get the tag.
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20 @param eax The EAX state
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21 @param tag [out] The destination of the authentication tag
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22 @param taglen [in/out] The max length and resulting length of the authentication tag
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23 @return CRYPT_OK if successful
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24 */
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25 int eax_done(eax_state *eax, unsigned char *tag, unsigned long *taglen)
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26 {
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27 int err;
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28 unsigned char *headermac, *ctmac;
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29 unsigned long x, len;
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30
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31 LTC_ARGCHK(eax != NULL);
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32 LTC_ARGCHK(tag != NULL);
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33 LTC_ARGCHK(taglen != NULL);
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34
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35 /* allocate ram */
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36 headermac = XMALLOC(MAXBLOCKSIZE);
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37 ctmac = XMALLOC(MAXBLOCKSIZE);
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38
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39 if (headermac == NULL || ctmac == NULL) {
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40 if (headermac != NULL) {
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41 XFREE(headermac);
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42 }
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43 if (ctmac != NULL) {
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44 XFREE(ctmac);
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45 }
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46 return CRYPT_MEM;
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47 }
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48
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49 /* finish ctomac */
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50 len = MAXBLOCKSIZE;
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51 if ((err = omac_done(&eax->ctomac, ctmac, &len)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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52 goto LBL_ERR;
285
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53 }
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54
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55 /* finish headeromac */
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56
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57 /* note we specifically don't reset len so the two lens are minimal */
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58
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59 if ((err = omac_done(&eax->headeromac, headermac, &len)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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60 goto LBL_ERR;
285
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61 }
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62
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63 /* terminate the CTR chain */
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64 if ((err = ctr_done(&eax->ctr)) != CRYPT_OK) {
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65 goto LBL_ERR;
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66 }
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67
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68 /* compute N xor H xor C */
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69 for (x = 0; x < len && x < *taglen; x++) {
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70 tag[x] = eax->N[x] ^ headermac[x] ^ ctmac[x];
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71 }
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72 *taglen = x;
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73
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74 err = CRYPT_OK;
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75 LBL_ERR:
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76 #ifdef LTC_CLEAN_STACK
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77 zeromem(ctmac, MAXBLOCKSIZE);
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78 zeromem(headermac, MAXBLOCKSIZE);
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79 zeromem(eax, sizeof(*eax));
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80 #endif
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81
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82 XFREE(ctmac);
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83 XFREE(headermac);
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84
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85 return err;
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86 }
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87
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diff changeset
88 #endif
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89
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
90 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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91 /* 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
92 /* commit time: $Format:%ai$ */