Mercurial > dropbear

annotate libtomcrypt/src/modes/lrw/lrw_start.c @ 1053:fd3712d1ff7f

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Better failure handling
author Matt Johnston <matt@ucc.asn.au>
date Sat, 28 Feb 2015 23:49:39 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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 lrw_start.c
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15 LRW_MODE implementation, start mode, Tom St Denis
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16 */
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17
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18 #ifdef LTC_LRW_MODE
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19
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20 /**
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21 Initialize the LRW context
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22 @param cipher The cipher desired, must be a 128-bit block cipher
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23 @param IV The index value, must be 128-bits
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24 @param key The cipher key
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25 @param keylen The length of the cipher key in octets
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26 @param tweak The tweak value (second key), must be 128-bits
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27 @param num_rounds The number of rounds for the cipher (0 == default)
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28 @param lrw [out] The LRW state
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29 @return CRYPT_OK on success.
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30 */
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31 int lrw_start( int cipher,
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32 const unsigned char *IV,
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33 const unsigned char *key, int keylen,
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34 const unsigned char *tweak,
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35 int num_rounds,
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36 symmetric_LRW *lrw)
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37 {
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38 int err;
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39 #ifdef LRW_TABLES
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40 unsigned char B[16];
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41 int x, y, z, t;
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42 #endif
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43
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44 LTC_ARGCHK(IV != NULL);
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45 LTC_ARGCHK(key != NULL);
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46 LTC_ARGCHK(tweak != NULL);
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47 LTC_ARGCHK(lrw != NULL);
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48
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49 #ifdef LTC_FAST
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50 if (16 % sizeof(LTC_FAST_TYPE)) {
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51 return CRYPT_INVALID_ARG;
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52 }
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53 #endif
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54
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55 /* is cipher valid? */
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56 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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57 return err;
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58 }
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59 if (cipher_descriptor[cipher].block_length != 16) {
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60 return CRYPT_INVALID_CIPHER;
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61 }
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62
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63 /* schedule key */
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64 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &lrw->key)) != CRYPT_OK) {
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65 return err;
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66 }
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67 lrw->cipher = cipher;
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68
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69 /* copy the IV and tweak */
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70 XMEMCPY(lrw->tweak, tweak, 16);
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71
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72 #ifdef LRW_TABLES
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73 /* setup tables */
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74 /* generate the first table as it has no shifting (from which we make the other tables) */
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75 zeromem(B, 16);
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76 for (y = 0; y < 256; y++) {
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77 B[0] = y;
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78 gcm_gf_mult(tweak, B, &lrw->PC[0][y][0]);
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79 }
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80
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81 /* now generate the rest of the tables based the previous table */
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82 for (x = 1; x < 16; x++) {
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83 for (y = 0; y < 256; y++) {
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84 /* now shift it right by 8 bits */
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85 t = lrw->PC[x-1][y][15];
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86 for (z = 15; z > 0; z--) {
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 lrw->PC[x][y][z] = lrw->PC[x-1][y][z-1];
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 lrw->PC[x][y][0] = gcm_shift_table[t<<1];
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 lrw->PC[x][y][1] ^= gcm_shift_table[(t<<1)+1];
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 }
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 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 /* generate first pad */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 return lrw_setiv(IV, 16, lrw);
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 /* $Source: /cvs/libtom/libtomcrypt/src/modes/lrw/lrw_start.c,v $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102 /* $Revision: 1.11 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 /* $Date: 2006/06/29 01:53:13 $ */