Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_memory.c @ 891:e78f5ce6e7bb

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cleanup before clearing keys
author Matt Johnston <matt@ucc.asn.au>
date Wed, 12 Feb 2014 22:15:02 +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_memory.c
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15 HMAC support, process a block of memory, Tom St Denis/Dobes Vandermeer
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16 */
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17
382
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18 #ifdef LTC_HMAC
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19
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20 /**
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21 HMAC a block of memory to produce the authentication tag
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22 @param hash The index of the hash to use
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23 @param key The secret key
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24 @param keylen The length of the secret key (octets)
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25 @param in The data to HMAC
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26 @param inlen The length of the data to HMAC (octets)
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27 @param out [out] Destination of the authentication tag
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28 @param outlen [in/out] Max size and resulting size of authentication tag
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29 @return CRYPT_OK if successful
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30 */
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31 int hmac_memory(int hash,
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32 const unsigned char *key, unsigned long keylen,
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33 const unsigned char *in, unsigned long inlen,
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34 unsigned char *out, unsigned long *outlen)
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35 {
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36 hmac_state *hmac;
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37 int err;
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38
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39 LTC_ARGCHK(key != NULL);
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40 LTC_ARGCHK(in != NULL);
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41 LTC_ARGCHK(out != NULL);
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42 LTC_ARGCHK(outlen != NULL);
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43
382
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44 /* make sure hash descriptor is valid */
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45 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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46 return err;
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47 }
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48
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49 /* is there a descriptor? */
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50 if (hash_descriptor[hash].hmac_block != NULL) {
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51 return hash_descriptor[hash].hmac_block(key, keylen, in, inlen, out, outlen);
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52 }
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53
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54 /* nope, so call the hmac functions */
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55 /* allocate ram for hmac state */
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56 hmac = XMALLOC(sizeof(hmac_state));
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57 if (hmac == NULL) {
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58 return CRYPT_MEM;
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59 }
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60
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61 if ((err = hmac_init(hmac, hash, key, keylen)) != 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 if ((err = hmac_process(hmac, in, inlen)) != CRYPT_OK) {
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66 goto LBL_ERR;
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67 }
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68
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69 if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) {
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70 goto LBL_ERR;
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71 }
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72
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73 err = CRYPT_OK;
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74 LBL_ERR:
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75 #ifdef LTC_CLEAN_STACK
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76 zeromem(hmac, sizeof(hmac_state));
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77 #endif
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78
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79 XFREE(hmac);
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80 return err;
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81 }
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82
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83 #endif
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84
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85
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86 /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_memory.c,v $ */
382
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87 /* $Revision: 1.6 $ */
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88 /* $Date: 2006/11/03 00:39:49 $ */