Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_done.c @ 790:7bd88d546627

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Avoid segfault for locked accounts (invalid salt to crypt())
author Matt Johnston <matt@ucc.asn.au>
date Mon, 29 Apr 2013 23:42:37 +0800
parents 0cbe8f6dbf9e
children a2bfd4374878
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 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file hmac_done.c
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15 HMAC support, terminate stream, Tom St Denis/Dobes Vandermeer
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16 */
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17
382
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18 #ifdef LTC_HMAC
285
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19
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20 #define HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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21
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22 /**
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23 Terminate an HMAC session
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24 @param hmac The HMAC state
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25 @param out [out] The destination of the HMAC authentication tag
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26 @param outlen [in/out] The max size and resulting size of the HMAC authentication tag
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27 @return CRYPT_OK if successful
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28 */
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29 int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen)
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30 {
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31 unsigned char *buf, *isha;
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32 unsigned long hashsize, i;
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33 int hash, err;
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34
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35 LTC_ARGCHK(hmac != NULL);
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36 LTC_ARGCHK(out != NULL);
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37
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38 /* test hash */
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39 hash = hmac->hash;
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40 if((err = hash_is_valid(hash)) != CRYPT_OK) {
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41 return err;
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42 }
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43
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44 /* get the hash message digest size */
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45 hashsize = hash_descriptor[hash].hashsize;
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46
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47 /* allocate buffers */
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48 buf = XMALLOC(HMAC_BLOCKSIZE);
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49 isha = XMALLOC(hashsize);
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50 if (buf == NULL || isha == NULL) {
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51 if (buf != NULL) {
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52 XFREE(buf);
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53 }
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54 if (isha != NULL) {
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55 XFREE(isha);
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56 }
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57 return CRYPT_MEM;
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58 }
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59
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60 /* Get the hash of the first HMAC vector plus the data */
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61 if ((err = hash_descriptor[hash].done(&hmac->md, isha)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64
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65 /* Create the second HMAC vector vector for step (3) */
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66 for(i=0; i < HMAC_BLOCKSIZE; i++) {
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67 buf[i] = hmac->key[i] ^ 0x5C;
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68 }
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69
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70 /* Now calculate the "outer" hash for step (5), (6), and (7) */
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71 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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72 goto LBL_ERR;
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73 }
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74 if ((err = hash_descriptor[hash].process(&hmac->md, buf, HMAC_BLOCKSIZE)) != CRYPT_OK) {
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75 goto LBL_ERR;
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76 }
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77 if ((err = hash_descriptor[hash].process(&hmac->md, isha, hashsize)) != CRYPT_OK) {
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78 goto LBL_ERR;
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79 }
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80 if ((err = hash_descriptor[hash].done(&hmac->md, buf)) != CRYPT_OK) {
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81 goto LBL_ERR;
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82 }
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83
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84 /* copy to output */
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85 for (i = 0; i < hashsize && i < *outlen; i++) {
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86 out[i] = buf[i];
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87 }
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88 *outlen = i;
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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 err = CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 LBL_ERR:
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 XFREE(hmac->key);
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(isha, hashsize);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 zeromem(buf, hashsize);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 zeromem(hmac, sizeof(*hmac));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 XFREE(isha);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 XFREE(buf);
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 return err;
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
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107 /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_done.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
108 /* $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
109 /* $Date: 2006/11/03 00:39:49 $ */