Mercurial > dropbear

annotate libtomcrypt/src/modes/f8/f8_start.c @ 1923:ffa0f666fde2

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Expand home path for MOTD file Patch modified by Matt Johnston Signed-off-by: Begley Brothers Inc <[email protected]>
author Begley Brothers Inc <begleybrothers@gmail.com>
date Thu, 09 Jul 2020 22:06:26 +1000
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file f8_start.c
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13 F8 implementation, start chain, Tom St Denis
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14 */
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15
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16
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17 #ifdef LTC_F8_MODE
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18
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19 /**
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20 Initialize an F8 context
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21 @param cipher The index of the cipher desired
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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22 @param IV The initialization vector
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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23 @param key The secret key
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24 @param keylen The length of the secret key (octets)
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25 @param salt_key The salting key for the IV
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26 @param skeylen The length of the salting key (octets)
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27 @param num_rounds Number of rounds in the cipher desired (0 for default)
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28 @param f8 The F8 state to initialize
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29 @return CRYPT_OK if successful
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30 */
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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31 int f8_start( int cipher, const unsigned char *IV,
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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32 const unsigned char *key, int keylen,
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33 const unsigned char *salt_key, int skeylen,
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34 int num_rounds, symmetric_F8 *f8)
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35 {
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36 int x, err;
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37 unsigned char tkey[MAXBLOCKSIZE];
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38
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39 LTC_ARGCHK(IV != NULL);
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40 LTC_ARGCHK(key != NULL);
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41 LTC_ARGCHK(salt_key != NULL);
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42 LTC_ARGCHK(f8 != NULL);
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43
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44 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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45 return err;
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46 }
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47
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48 #ifdef LTC_FAST
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49 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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50 return CRYPT_INVALID_ARG;
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51 }
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52 #endif
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53
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54 /* copy details */
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55 f8->blockcnt = 0;
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56 f8->cipher = cipher;
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57 f8->blocklen = cipher_descriptor[cipher].block_length;
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58 f8->padlen = f8->blocklen;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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59
382
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60 /* now get key ^ salt_key [extend salt_ket with 0x55 as required to match length] */
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61 zeromem(tkey, sizeof(tkey));
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62 for (x = 0; x < keylen && x < (int)sizeof(tkey); x++) {
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63 tkey[x] = key[x];
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64 }
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65 for (x = 0; x < skeylen && x < (int)sizeof(tkey); x++) {
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66 tkey[x] ^= salt_key[x];
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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67 }
382
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68 for (; x < keylen && x < (int)sizeof(tkey); x++) {
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69 tkey[x] ^= 0x55;
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70 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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71
382
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72 /* now encrypt with tkey[0..keylen-1] the IV and use that as the IV */
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73 if ((err = cipher_descriptor[cipher].setup(tkey, keylen, num_rounds, &f8->key)) != CRYPT_OK) {
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74 return err;
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75 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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76
382
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77 /* encrypt IV */
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78 if ((err = cipher_descriptor[f8->cipher].ecb_encrypt(IV, f8->MIV, &f8->key)) != CRYPT_OK) {
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79 cipher_descriptor[f8->cipher].done(&f8->key);
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80 return err;
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81 }
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82 zeromem(tkey, sizeof(tkey));
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Matt Johnston <matt@ucc.asn.au>
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83 zeromem(f8->IV, sizeof(f8->IV));
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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84
382
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85 /* terminate this cipher */
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86 cipher_descriptor[f8->cipher].done(&f8->key);
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
87
382
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88 /* init the cipher */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 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:
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90 }
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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91
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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92 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
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93
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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94 /* 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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95 /* 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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96 /* commit time: $Format:%ai$ */