Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_init.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
parents 6dba84798cd5
children
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rev   line source
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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 omac_init.c
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13 OMAC1 support, initialize state, by Tom St Denis
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14 */
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16
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17 #ifdef LTC_OMAC
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19 /**
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20 Initialize an OMAC state
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21 @param omac The OMAC state to initialize
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22 @param cipher The index of the desired cipher
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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 @return CRYPT_OK if successful
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26 */
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27 int omac_init(omac_state *omac, int cipher, const unsigned char *key, unsigned long keylen)
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28 {
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29 int err, x, y, mask, msb, len;
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30
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31 LTC_ARGCHK(omac != NULL);
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32 LTC_ARGCHK(key != NULL);
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34 /* schedule the key */
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35 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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36 return err;
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37 }
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38
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39 #ifdef LTC_FAST
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40 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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41 return CRYPT_INVALID_ARG;
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42 }
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43 #endif
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44
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45 /* now setup the system */
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46 switch (cipher_descriptor[cipher].block_length) {
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47 case 8: mask = 0x1B;
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48 len = 8;
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49 break;
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50 case 16: mask = 0x87;
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51 len = 16;
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52 break;
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53 default: return CRYPT_INVALID_ARG;
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54 }
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55
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56 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &omac->key)) != CRYPT_OK) {
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57 return err;
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58 }
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59
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60 /* ok now we need Lu and Lu^2 [calc one from the other] */
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61
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62 /* first calc L which is Ek(0) */
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63 zeromem(omac->Lu[0], cipher_descriptor[cipher].block_length);
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64 if ((err = cipher_descriptor[cipher].ecb_encrypt(omac->Lu[0], omac->Lu[0], &omac->key)) != CRYPT_OK) {
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65 return err;
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66 }
285
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67
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68 /* now do the mults, whoopy! */
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69 for (x = 0; x < 2; x++) {
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70 /* if msb(L * u^(x+1)) = 0 then just shift, otherwise shift and xor constant mask */
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71 msb = omac->Lu[x][0] >> 7;
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72
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73 /* shift left */
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74 for (y = 0; y < (len - 1); y++) {
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75 omac->Lu[x][y] = ((omac->Lu[x][y] << 1) | (omac->Lu[x][y+1] >> 7)) & 255;
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76 }
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77 omac->Lu[x][len - 1] = ((omac->Lu[x][len - 1] << 1) ^ (msb ? mask : 0)) & 255;
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78
285
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79 /* copy up as require */
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80 if (x == 0) {
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81 XMEMCPY(omac->Lu[1], omac->Lu[0], sizeof(omac->Lu[0]));
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82 }
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83 }
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84
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85 /* setup state */
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86 omac->cipher_idx = cipher;
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87 omac->buflen = 0;
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88 omac->blklen = len;
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89 zeromem(omac->prev, sizeof(omac->prev));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 zeromem(omac->block, sizeof(omac->block));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
97 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
98 /* 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
99 /* commit time: $Format:%ai$ */