Mercurial > dropbear

annotate libtomcrypt/src/modes/f8/f8_start.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +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 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
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22 @param IV The initialization vector
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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 */
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31 int f8_start( int cipher, const unsigned char *IV,
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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;
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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];
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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67 }
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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 }
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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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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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83 zeromem(f8->IV, sizeof(f8->IV));
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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87
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
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:
diff changeset
90 }
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 #endif
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
94 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
95 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
96 /* commit time: $Format:%ai$ */