Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_decrypt_verify_memory.c @ 958:1bf92da7a2a0

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Try without identifying current user Small change that warns the user if the current user cannot be identified rather than aborting. This came in handy when I put dropbear on a dlink that did not have a true user environment. Falling back on the "-l" option and user@ options works just fine as a client. The only implication I found is that the -J option will fail ungracefully without a known own_user.
author iquaba <cooka2011@gmail.com>
date Wed, 06 Aug 2014 08:48:43 -0500
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 *
382
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diff changeset
9 * Tom St Denis, [email protected], http://libtomcrypt.com
285
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10 */
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11
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12 /**
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13 @file eax_decrypt_verify_memory.c
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14 EAX implementation, decrypt block of memory, by Tom St Denis
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15 */
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16 #include "tomcrypt.h"
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17
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18 #ifdef EAX_MODE
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19
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20 /**
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21 Decrypt a block of memory and verify the provided MAC tag with EAX
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22 @param cipher The index of the cipher desired
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23 @param key The secret key
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24 @param keylen The length of the key (octets)
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25 @param nonce The nonce data (use once) for the session
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26 @param noncelen The length of the nonce data.
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27 @param header The session header data
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28 @param headerlen The length of the header (octets)
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29 @param ct The ciphertext
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30 @param ctlen The length of the ciphertext (octets)
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31 @param pt [out] The plaintext
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32 @param tag The authentication tag provided by the encoder
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33 @param taglen [in/out] The length of the tag (octets)
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34 @param stat [out] The result of the decryption (1==valid tag, 0==invalid)
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35 @return CRYPT_OK if successful regardless of the resulting tag comparison
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36 */
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37 int eax_decrypt_verify_memory(int cipher,
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38 const unsigned char *key, unsigned long keylen,
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39 const unsigned char *nonce, unsigned long noncelen,
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40 const unsigned char *header, unsigned long headerlen,
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41 const unsigned char *ct, unsigned long ctlen,
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42 unsigned char *pt,
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43 unsigned char *tag, unsigned long taglen,
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44 int *stat)
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45 {
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46 int err;
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47 eax_state *eax;
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48 unsigned char *buf;
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49 unsigned long buflen;
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50
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51 LTC_ARGCHK(stat != NULL);
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52 LTC_ARGCHK(key != NULL);
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53 LTC_ARGCHK(pt != NULL);
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54 LTC_ARGCHK(ct != NULL);
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55 LTC_ARGCHK(tag != NULL);
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56
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57 /* default to zero */
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58 *stat = 0;
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59
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60 /* allocate ram */
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61 buf = XMALLOC(taglen);
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62 eax = XMALLOC(sizeof(*eax));
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63 if (eax == NULL || buf == NULL) {
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64 if (eax != NULL) {
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65 XFREE(eax);
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66 }
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67 if (buf != NULL) {
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68 XFREE(buf);
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69 }
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70 return CRYPT_MEM;
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71 }
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72
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73 if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) {
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74 goto LBL_ERR;
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75 }
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76
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77 if ((err = eax_decrypt(eax, ct, pt, ctlen)) != CRYPT_OK) {
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78 goto LBL_ERR;
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79 }
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80
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81 buflen = taglen;
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82 if ((err = eax_done(eax, buf, &buflen)) != CRYPT_OK) {
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83 goto LBL_ERR;
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84 }
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85
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86 /* compare tags */
382
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diff changeset
87 if (buflen >= taglen && XMEMCMP(buf, tag, taglen) == 0) {
285
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88 *stat = 1;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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89 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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90
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 err = CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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92 LBL_ERR:
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 #ifdef LTC_CLEAN_STACK
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Matt Johnston <matt@ucc.asn.au>
parents:
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94 zeromem(buf, taglen);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 zeromem(eax, sizeof(*eax));
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:
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97
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 XFREE(eax);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 XFREE(buf);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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100
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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101 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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102 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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103
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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104 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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105
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 /* $Source: /cvs/libtom/libtomcrypt/src/encauth/eax/eax_decrypt_verify_memory.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
107 /* $Revision: 1.5 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
108 /* $Date: 2006/11/01 09:28:17 $ */