Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_memory.c @ 409:0e69e948caba

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Add comments about requiring keysize <= 2*SHA1_HASH_SIZE
author Matt Johnston <matt@ucc.asn.au>
date Sun, 04 Feb 2007 10:31:48 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
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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.org
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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 omac_memory.c
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15 OMAC1 support, process a block of memory, Tom St Denis
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16 */
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17
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18 #ifdef OMAC
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19
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20 /**
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21 OMAC a block of memory
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22 @param cipher The index of the desired cipher
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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 send through OMAC
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26 @param inlen The length of the data to send through OMAC (octets)
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27 @param out [out] The destination of the authentication tag
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28 @param outlen [in/out] The max size and resulting size of the authentication tag (octets)
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29 @return CRYPT_OK if successful
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30 */
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31 int omac_memory(int cipher,
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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 int err;
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37 omac_state *omac;
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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
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44 /* allocate ram for omac state */
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45 omac = XMALLOC(sizeof(omac_state));
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46 if (omac == NULL) {
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47 return CRYPT_MEM;
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48 }
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49
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50 /* omac process the message */
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51 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
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52 goto LBL_ERR;
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53 }
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54 if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) {
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55 goto LBL_ERR;
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56 }
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57 if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
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58 goto LBL_ERR;
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59 }
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60
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61 err = CRYPT_OK;
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62 LBL_ERR:
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63 #ifdef LTC_CLEAN_STACK
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64 zeromem(omac, sizeof(omac_state));
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65 #endif
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66
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67 XFREE(omac);
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68 return err;
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69 }
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70
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71 #endif
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72
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73 /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_memory.c,v $ */
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74 /* $Revision: 1.3 $ */
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75 /* $Date: 2005/05/05 14:35:58 $ */