Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_done.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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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.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