annotate libtomcrypt/src/modes/lrw/lrw_start.c @ 1646:6d1bbe7d5fa5 DROPBEAR_2019.77

2019.77
author Matt Johnston <matt@ucc.asn.au>
date Sat, 23 Mar 2019 21:46:29 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file lrw_start.c
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13 LRW_MODE implementation, start mode, Tom St Denis
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14 */
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15
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16 #ifdef LTC_LRW_MODE
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17
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18 /**
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19 Initialize the LRW context
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20 @param cipher The cipher desired, must be a 128-bit block cipher
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21 @param IV The index value, must be 128-bits
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22 @param key The cipher key
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23 @param keylen The length of the cipher key in octets
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24 @param tweak The tweak value (second key), must be 128-bits
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25 @param num_rounds The number of rounds for the cipher (0 == default)
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26 @param lrw [out] The LRW state
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27 @return CRYPT_OK on success.
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28 */
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29 int lrw_start( int cipher,
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30 const unsigned char *IV,
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31 const unsigned char *key, int keylen,
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32 const unsigned char *tweak,
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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33 int num_rounds,
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34 symmetric_LRW *lrw)
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35 {
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36 int err;
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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37 #ifdef LTC_LRW_TABLES
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38 unsigned char B[16];
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39 int x, y, z, t;
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40 #endif
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41
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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42 LTC_ARGCHK(IV != NULL);
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43 LTC_ARGCHK(key != NULL);
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44 LTC_ARGCHK(tweak != NULL);
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45 LTC_ARGCHK(lrw != NULL);
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46
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47 #ifdef LTC_FAST
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48 if (16 % sizeof(LTC_FAST_TYPE)) {
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49 return CRYPT_INVALID_ARG;
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50 }
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51 #endif
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52
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53 /* is cipher valid? */
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54 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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55 return err;
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56 }
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57 if (cipher_descriptor[cipher].block_length != 16) {
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58 return CRYPT_INVALID_CIPHER;
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59 }
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60
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61 /* schedule key */
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62 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &lrw->key)) != CRYPT_OK) {
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63 return err;
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64 }
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65 lrw->cipher = cipher;
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66
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67 /* copy the IV and tweak */
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68 XMEMCPY(lrw->tweak, tweak, 16);
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69
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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70 #ifdef LTC_LRW_TABLES
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71 /* setup tables */
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72 /* generate the first table as it has no shifting (from which we make the other tables) */
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73 zeromem(B, 16);
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74 for (y = 0; y < 256; y++) {
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75 B[0] = y;
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76 gcm_gf_mult(tweak, B, &lrw->PC[0][y][0]);
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77 }
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78
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79 /* now generate the rest of the tables based the previous table */
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80 for (x = 1; x < 16; x++) {
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81 for (y = 0; y < 256; y++) {
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82 /* now shift it right by 8 bits */
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83 t = lrw->PC[x-1][y][15];
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84 for (z = 15; z > 0; z--) {
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85 lrw->PC[x][y][z] = lrw->PC[x-1][y][z-1];
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86 }
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87 lrw->PC[x][y][0] = gcm_shift_table[t<<1];
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88 lrw->PC[x][y][1] ^= gcm_shift_table[(t<<1)+1];
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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89 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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90 }
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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91 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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parents:
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92
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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93 /* generate first pad */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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94 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:
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95 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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96
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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97
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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98 #endif
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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99 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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100 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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101 /* commit time: $Format:%ai$ */