Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_done.c @ 1491:1ea92dd2ca5f

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update default_options.h
author Matt Johnston <matt@ucc.asn.au>
date Wed, 14 Feb 2018 00:17:22 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file hmac_done.c
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13 HMAC support, terminate stream, Tom St Denis/Dobes Vandermeer
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14 */
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15
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16 #ifdef LTC_HMAC
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17
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18 #define LTC_HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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19
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20 /**
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21 Terminate an HMAC session
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22 @param hmac The HMAC state
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23 @param out [out] The destination of the HMAC authentication tag
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24 @param outlen [in/out] The max size and resulting size of the HMAC authentication tag
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25 @return CRYPT_OK if successful
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26 */
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27 int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen)
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28 {
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29 unsigned char buf[MAXBLOCKSIZE], isha[MAXBLOCKSIZE];
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30 unsigned long hashsize, i;
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31 int hash, err;
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32
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33 LTC_ARGCHK(hmac != NULL);
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34 LTC_ARGCHK(out != NULL);
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35
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36 /* test hash */
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37 hash = hmac->hash;
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38 if((err = hash_is_valid(hash)) != CRYPT_OK) {
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39 return err;
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40 }
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41
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42 /* get the hash message digest size */
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43 hashsize = hash_descriptor[hash].hashsize;
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44
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45 if ((err = hash_descriptor[hash].done(&hmac->md, isha)) != CRYPT_OK) {
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46 goto LBL_ERR;
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47 }
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48
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49 /* Create the second HMAC vector vector for step (3) */
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50 for(i=0; i < LTC_HMAC_BLOCKSIZE; i++) {
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51 buf[i] = hmac->key[i] ^ 0x5C;
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52 }
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53
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54 /* Now calculate the "outer" hash for step (5), (6), and (7) */
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55 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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56 goto LBL_ERR;
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57 }
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58 if ((err = hash_descriptor[hash].process(&hmac->md, buf, LTC_HMAC_BLOCKSIZE)) != 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, isha, hashsize)) != 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].done(&hmac->md, buf)) != 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 /* copy to output */
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69 for (i = 0; i < hashsize && i < *outlen; i++) {
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70 out[i] = buf[i];
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71 }
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72 *outlen = i;
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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 XFREE(hmac->key);
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77 #ifdef LTC_CLEAN_STACK
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78 zeromem(isha, hashsize);
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79 zeromem(buf, hashsize);
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80 zeromem(hmac, sizeof(*hmac));
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81 #endif
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82
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83 return err;
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84 }
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85
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86 #endif
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87
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88 /* ref: $Format:%D$ */
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89 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 /* commit time: $Format:%ai$ */