Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_init.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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11 /**
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12 @file omac_init.c
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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20 Initialize an OMAC state
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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33
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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;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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parents:
diff changeset
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: $Format:%ai$ */