Mercurial > dropbear

annotate libtomcrypt/src/mac/pmac/pmac_process.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 pmac_process.c
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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13 PMAC implementation, process data, by Tom St Denis
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14 */
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16
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17 #ifdef LTC_PMAC
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19 /**
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20 Process data in a PMAC stream
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21 @param pmac The PMAC state
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22 @param in The data to send through PMAC
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23 @param inlen The length of the data to send through PMAC
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24 @return CRYPT_OK if successful
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25 */
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26 int pmac_process(pmac_state *pmac, const unsigned char *in, unsigned long inlen)
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27 {
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28 int err, n;
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29 unsigned long x;
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30 unsigned char Z[MAXBLOCKSIZE];
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32 LTC_ARGCHK(pmac != NULL);
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33 LTC_ARGCHK(in != NULL);
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34 if ((err = cipher_is_valid(pmac->cipher_idx)) != CRYPT_OK) {
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35 return err;
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36 }
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37
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38 if ((pmac->buflen > (int)sizeof(pmac->block)) || (pmac->buflen < 0) ||
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39 (pmac->block_len > (int)sizeof(pmac->block)) || (pmac->buflen > pmac->block_len)) {
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40 return CRYPT_INVALID_ARG;
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41 }
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43 #ifdef LTC_FAST
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44 if (pmac->buflen == 0 && inlen > 16) {
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45 unsigned long y;
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46 for (x = 0; x < (inlen - 16); x += 16) {
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47 pmac_shift_xor(pmac);
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48 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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49 *(LTC_FAST_TYPE_PTR_CAST(&Z[y])) = *(LTC_FAST_TYPE_PTR_CAST(&in[y])) ^ *(LTC_FAST_TYPE_PTR_CAST(&pmac->Li[y]));
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50 }
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51 if ((err = cipher_descriptor[pmac->cipher_idx].ecb_encrypt(Z, Z, &pmac->key)) != CRYPT_OK) {
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52 return err;
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53 }
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54 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) {
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55 *(LTC_FAST_TYPE_PTR_CAST(&pmac->checksum[y])) ^= *(LTC_FAST_TYPE_PTR_CAST(&Z[y]));
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56 }
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57 in += 16;
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58 }
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59 inlen -= x;
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60 }
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61 #endif
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62
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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63 while (inlen != 0) {
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64 /* ok if the block is full we xor in prev, encrypt and replace prev */
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65 if (pmac->buflen == pmac->block_len) {
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66 pmac_shift_xor(pmac);
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67 for (x = 0; x < (unsigned long)pmac->block_len; x++) {
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68 Z[x] = pmac->Li[x] ^ pmac->block[x];
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69 }
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70 if ((err = cipher_descriptor[pmac->cipher_idx].ecb_encrypt(Z, Z, &pmac->key)) != CRYPT_OK) {
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71 return err;
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72 }
285
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73 for (x = 0; x < (unsigned long)pmac->block_len; x++) {
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74 pmac->checksum[x] ^= Z[x];
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75 }
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76 pmac->buflen = 0;
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77 }
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78
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79 /* add bytes */
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80 n = MIN(inlen, (unsigned long)(pmac->block_len - pmac->buflen));
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81 XMEMCPY(pmac->block + pmac->buflen, in, n);
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82 pmac->buflen += n;
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83 inlen -= n;
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84 in += n;
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85 }
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86
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87 #ifdef LTC_CLEAN_STACK
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 zeromem(Z, sizeof(Z));
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 return CRYPT_OK;
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 }
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 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
96 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
97 /* 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
98 /* commit time: $Format:%ai$ */