Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_done.c @ 1496:da3bed08607b

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fix compile warnings
author Matt Johnston <matt@ucc.asn.au>
date Wed, 14 Feb 2018 23:09:28 +0800
parents 6dba84798cd5
children
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
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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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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;
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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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88 #endif
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89
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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91 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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92 /* commit time: $Format:%ai$ */