Mercurial > dropbear

annotate libtomcrypt/src/encauth/eax/eax_decrypt_verify_memory.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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:
diff changeset
89 }
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 err = CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
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:
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 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:
diff changeset
100
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 return err;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
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 $ */