Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_init.c @ 553:8711f20b89ab

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- For uclinux, only cleanup on exit for the main process. This avoids trashing the state when a failing child exits.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 09 Jul 2009 16:01:30 +0000
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, [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_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