Mercurial > dropbear

annotate libtomcrypt/src/modes/f8/f8_start.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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diff changeset
7 * guarantee it works.
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8 *
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diff changeset
9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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diff changeset
11 #include "tomcrypt.h"
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12
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13 /**
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14 @file f8_start.c
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diff changeset
15 F8 implementation, start chain, Tom St Denis
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16 */
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17
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18
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19 #ifdef LTC_F8_MODE
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20
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21 /**
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22 Initialize an F8 context
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23 @param cipher The index of the cipher desired
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24 @param IV The initial vector
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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 @param salt_key The salting key for the IV
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28 @param skeylen The length of the salting key (octets)
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29 @param num_rounds Number of rounds in the cipher desired (0 for default)
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30 @param f8 The F8 state to initialize
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31 @return CRYPT_OK if successful
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32 */
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33 int f8_start( int cipher, const unsigned char *IV,
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34 const unsigned char *key, int keylen,
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35 const unsigned char *salt_key, int skeylen,
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36 int num_rounds, symmetric_F8 *f8)
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37 {
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38 int x, err;
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39 unsigned char tkey[MAXBLOCKSIZE];
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40
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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41 LTC_ARGCHK(IV != NULL);
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42 LTC_ARGCHK(key != NULL);
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43 LTC_ARGCHK(salt_key != NULL);
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44 LTC_ARGCHK(f8 != NULL);
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45
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46 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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47 return err;
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48 }
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49
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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50 #ifdef LTC_FAST
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51 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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52 return CRYPT_INVALID_ARG;
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53 }
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54 #endif
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55
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56 /* copy details */
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57 f8->blockcnt = 0;
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58 f8->cipher = cipher;
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59 f8->blocklen = cipher_descriptor[cipher].block_length;
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60 f8->padlen = f8->blocklen;
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61
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62 /* now get key ^ salt_key [extend salt_ket with 0x55 as required to match length] */
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63 zeromem(tkey, sizeof(tkey));
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64 for (x = 0; x < keylen && x < (int)sizeof(tkey); x++) {
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65 tkey[x] = key[x];
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66 }
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67 for (x = 0; x < skeylen && x < (int)sizeof(tkey); x++) {
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Matt Johnston <matt@ucc.asn.au>
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68 tkey[x] ^= salt_key[x];
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69 }
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70 for (; x < keylen && x < (int)sizeof(tkey); x++) {
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Matt Johnston <matt@ucc.asn.au>
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71 tkey[x] ^= 0x55;
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Matt Johnston <matt@ucc.asn.au>
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72 }
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73
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
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74 /* now encrypt with tkey[0..keylen-1] the IV and use that as the IV */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
75 if ((err = cipher_descriptor[cipher].setup(tkey, keylen, num_rounds, &f8->key)) != CRYPT_OK) {
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
76 return err;
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77 }
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Matt Johnston <matt@ucc.asn.au>
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78
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
79 /* encrypt IV */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(IV, f8->MIV, &f8->key)) != CRYPT_OK) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
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diff changeset
81 cipher_descriptor[f8->cipher].done(&f8->key);
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Matt Johnston <matt@ucc.asn.au>
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82 return err;
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Matt Johnston <matt@ucc.asn.au>
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83 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 zeromem(tkey, sizeof(tkey));
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 zeromem(f8->IV, sizeof(f8->IV));
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 /* terminate this cipher */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 cipher_descriptor[f8->cipher].done(&f8->key);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 /* init the cipher */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &f8->key);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 /* $Source: /cvs/libtom/libtomcrypt/src/modes/f8/f8_start.c,v $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 /* $Revision: 1.7 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 /* $Date: 2006/11/05 01:36:43 $ */