Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_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
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 omac_init.c
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15 OMAC1 support, initialize state, by Tom St Denis
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16 */
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17
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18
382
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19 #ifdef LTC_OMAC
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20
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21 /**
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22 Initialize an OMAC state
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23 @param omac The OMAC state to initialize
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24 @param cipher The index of the desired cipher
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25 @param key The secret key
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26 @param keylen The length of the secret key (octets)
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27 @return CRYPT_OK if successful
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28 */
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29 int omac_init(omac_state *omac, int cipher, const unsigned char *key, unsigned long keylen)
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30 {
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31 int err, x, y, mask, msb, len;
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32
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33 LTC_ARGCHK(omac != NULL);
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34 LTC_ARGCHK(key != NULL);
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35
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36 /* schedule the key */
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37 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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38 return err;
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39 }
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40
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41 #ifdef LTC_FAST
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42 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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43 return CRYPT_INVALID_ARG;
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44 }
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45 #endif
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46
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47 /* now setup the system */
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48 switch (cipher_descriptor[cipher].block_length) {
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49 case 8: mask = 0x1B;
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50 len = 8;
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51 break;
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52 case 16: mask = 0x87;
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53 len = 16;
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54 break;
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55 default: return CRYPT_INVALID_ARG;
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56 }
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57
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58 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &omac->key)) != CRYPT_OK) {
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59 return err;
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60 }
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61
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62 /* ok now we need Lu and Lu^2 [calc one from the other] */
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63
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64 /* first calc L which is Ek(0) */
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65 zeromem(omac->Lu[0], cipher_descriptor[cipher].block_length);
382
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66 if ((err = cipher_descriptor[cipher].ecb_encrypt(omac->Lu[0], omac->Lu[0], &omac->key)) != CRYPT_OK) {
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67 return err;
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68 }
285
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69
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70 /* now do the mults, whoopy! */
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71 for (x = 0; x < 2; x++) {
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72 /* if msb(L * u^(x+1)) = 0 then just shift, otherwise shift and xor constant mask */
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73 msb = omac->Lu[x][0] >> 7;
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74
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75 /* shift left */
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76 for (y = 0; y < (len - 1); y++) {
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77 omac->Lu[x][y] = ((omac->Lu[x][y] << 1) | (omac->Lu[x][y+1] >> 7)) & 255;
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78 }
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79 omac->Lu[x][len - 1] = ((omac->Lu[x][len - 1] << 1) ^ (msb ? mask : 0)) & 255;
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80
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81 /* copy up as require */
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82 if (x == 0) {
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83 XMEMCPY(omac->Lu[1], omac->Lu[0], sizeof(omac->Lu[0]));
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84 }
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85 }
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86
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87 /* setup state */
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diff changeset
88 omac->cipher_idx = cipher;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 omac->buflen = 0;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 omac->blklen = len;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 zeromem(omac->prev, sizeof(omac->prev));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 zeromem(omac->block, sizeof(omac->block));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_init.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
100 /* $Revision: 1.10 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
101 /* $Date: 2006/11/03 00:39:49 $ */