Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_done.c @ 1056:a2bfd4374878 nocircbuffer

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Avoid malloc in hmac
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 14:46:04 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 * 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
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18 #ifdef LTC_HMAC
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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 {
1056
a2bfd4374878 Avoid malloc in hmac
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31 unsigned char buf[MAXBLOCKSIZE], isha[MAXBLOCKSIZE];
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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 /* Get the hash of the first HMAC vector plus the data */
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48 if ((err = hash_descriptor[hash].done(&hmac->md, isha)) != CRYPT_OK) {
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49 goto LBL_ERR;
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50 }
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51
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52 /* Create the second HMAC vector vector for step (3) */
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53 for(i=0; i < HMAC_BLOCKSIZE; i++) {
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54 buf[i] = hmac->key[i] ^ 0x5C;
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55 }
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56
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57 /* Now calculate the "outer" hash for step (5), (6), and (7) */
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58 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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59 goto LBL_ERR;
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60 }
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61 if ((err = hash_descriptor[hash].process(&hmac->md, buf, HMAC_BLOCKSIZE)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64 if ((err = hash_descriptor[hash].process(&hmac->md, isha, hashsize)) != CRYPT_OK) {
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65 goto LBL_ERR;
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66 }
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67 if ((err = hash_descriptor[hash].done(&hmac->md, buf)) != CRYPT_OK) {
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68 goto LBL_ERR;
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69 }
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70
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71 /* copy to output */
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72 for (i = 0; i < hashsize && i < *outlen; i++) {
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73 out[i] = buf[i];
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74 }
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75 *outlen = i;
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76
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77 err = CRYPT_OK;
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78 LBL_ERR:
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79 XFREE(hmac->key);
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80 #ifdef LTC_CLEAN_STACK
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81 zeromem(isha, hashsize);
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82 zeromem(buf, hashsize);
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83 zeromem(hmac, sizeof(*hmac));
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84 #endif
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85
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86 return err;
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87 }
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88
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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89 #endif
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:
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91 /* $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
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92 /* $Revision: 1.5 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
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93 /* $Date: 2006/11/03 00:39:49 $ */