Mercurial > dropbear

annotate libtomcrypt/src/modes/lrw/lrw_start.c @ 994:5c5ade336926

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Prefer stronger algorithms in algorithm negotiation. Prefer diffie-hellman-group14-sha1 (2048 bit) over diffie-hellman-group1-sha1 (1024 bit). Due to meet-in-the-middle attacks the effective key length of three key 3DES is 112 bits. AES is stronger and faster then 3DES. Prefer to delay the start of compression until after authentication has completed. This avoids exposing compression code to attacks from unauthenticated users. (github pull request #9)
author Fedor Brunner <fedor.brunner@azet.sk>
date Fri, 23 Jan 2015 23:00:25 +0800
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 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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diff changeset
85 t = lrw->PC[x-1][y][15];
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
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 $ */