Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_init.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 (2007-07-19)
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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, tomstdenis@gmail.com, 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_init.c
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15 XCBC Support, start an XCBC 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 /** Initialize XCBC-MAC state
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21 @param xcbc [out] XCBC state to initialize
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22 @param cipher Index of cipher to use
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23 @param key [in] Secret key
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24 @param keylen Length of secret key in octets
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25 Return CRYPT_OK on success
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26 */
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27 int xcbc_init(xcbc_state *xcbc, int cipher, const unsigned char *key, unsigned long keylen)
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28 {
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29 int x, y, err;
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30 symmetric_key *skey;
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31
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32 LTC_ARGCHK(xcbc != NULL);
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33 LTC_ARGCHK(key != NULL);
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34
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35 /* schedule the key */
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36 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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37 return err;
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38 }
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39
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40 #ifdef LTC_FAST
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41 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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42 return CRYPT_INVALID_ARG;
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43 }
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44 #endif
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45
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46 /* schedule the user key */
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47 skey = XCALLOC(1, sizeof(*skey));
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48 if (skey == NULL) {
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49 return CRYPT_MEM;
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50 }
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51
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52 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, skey)) != CRYPT_OK) {
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53 goto done;
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54 }
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55
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56 /* make the three keys */
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57 for (y = 0; y < 3; y++) {
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58 for (x = 0; x < cipher_descriptor[cipher].block_length; x++) {
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59 xcbc->K[y][x] = y + 1;
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60 }
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61 cipher_descriptor[cipher].ecb_encrypt(xcbc->K[y], xcbc->K[y], skey);
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62 }
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63
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64 /* setup K1 */
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65 err = cipher_descriptor[cipher].setup(xcbc->K[0], cipher_descriptor[cipher].block_length, 0, &xcbc->key);
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66
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67 /* setup struct */
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68 zeromem(xcbc->IV, cipher_descriptor[cipher].block_length);
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69 xcbc->blocksize = cipher_descriptor[cipher].block_length;
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70 xcbc->cipher = cipher;
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71 xcbc->buflen = 0;
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72 done:
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73 cipher_descriptor[cipher].done(skey);
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74 #ifdef LTC_CLEAN_STACK
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75 zeromem(skey, sizeof(*skey));
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76 #endif
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77 XFREE(skey);
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78 return err;
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79 }
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80
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81 #endif
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82
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83 /* $Source: /cvs/libtom/libtomcrypt/src/mac/xcbc/xcbc_init.c,v $ */
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84 /* $Revision: 1.4 $ */
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85 /* $Date: 2006/11/07 03:23:46 $ */
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86