Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_init.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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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
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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 }
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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
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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: $Format:%ai$ */