Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_done.c @ 690:4b47ff154ff6

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author Matt Johnston <matt@ucc.asn.au>
date Fri, 22 Feb 2013 23:53:49 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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382
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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 xcbc_done.c
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15 XCBC Support, terminate the state
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16 */
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17
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18 #ifdef LTC_XCBC
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19
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20 /** Terminate the XCBC-MAC state
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21 @param xcbc XCBC state to terminate
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22 @param out [out] Destination for the MAC tag
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23 @param outlen [in/out] Destination size and final tag size
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24 Return CRYPT_OK on success
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25 */
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26 int xcbc_done(xcbc_state *xcbc, unsigned char *out, unsigned long *outlen)
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27 {
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28 int err, x;
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29 LTC_ARGCHK(xcbc != NULL);
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30 LTC_ARGCHK(out != NULL);
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31
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32 /* check structure */
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33 if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) {
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34 return err;
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35 }
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36
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37 if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) ||
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38 (xcbc->buflen > xcbc->blocksize) || (xcbc->buflen < 0)) {
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39 return CRYPT_INVALID_ARG;
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40 }
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41
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42 /* which key do we use? */
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43 if (xcbc->buflen == xcbc->blocksize) {
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44 /* k2 */
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45 for (x = 0; x < xcbc->blocksize; x++) {
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46 xcbc->IV[x] ^= xcbc->K[1][x];
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47 }
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48 } else {
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49 xcbc->IV[xcbc->buflen] ^= 0x80;
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50 /* k3 */
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51 for (x = 0; x < xcbc->blocksize; x++) {
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52 xcbc->IV[x] ^= xcbc->K[2][x];
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53 }
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54 }
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55
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56 /* encrypt */
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57 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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58 cipher_descriptor[xcbc->cipher].done(&xcbc->key);
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59
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60 /* extract tag */
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61 for (x = 0; x < xcbc->blocksize && (unsigned long)x < *outlen; x++) {
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62 out[x] = xcbc->IV[x];
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63 }
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64 *outlen = x;
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65
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66 #ifdef LTC_CLEAN_STACK
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67 zeromem(xcbc, sizeof(*xcbc));
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68 #endif
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69 return CRYPT_OK;
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70 }
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71
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72 #endif
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73
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74 /* $Source: /cvs/libtom/libtomcrypt/src/mac/xcbc/xcbc_done.c,v $ */
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75 /* $Revision: 1.4 $ */
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76 /* $Date: 2006/11/07 03:23:46 $ */
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77