Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_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 1ff2a1034c52
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 hmac_init.c
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13 HMAC support, initialize state, Tom St Denis/Dobes Vandermeer
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14 */
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15
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16 #ifdef LTC_HMAC
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17
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18 #define LTC_HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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19
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20 /**
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21 Initialize an HMAC context.
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22 @param hmac The HMAC state
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23 @param hash The index of the hash you want to use
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24 @param key The secret key
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25 @param keylen The length of the secret key (octets)
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26 @return CRYPT_OK if successful
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27 */
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28 int hmac_init(hmac_state *hmac, int hash, const unsigned char *key, unsigned long keylen)
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29 {
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30 unsigned char buf[MAXBLOCKSIZE];
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31 unsigned long hashsize;
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32 unsigned long i, z;
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33 int err;
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34
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35 LTC_ARGCHK(hmac != NULL);
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36 LTC_ARGCHK(key != NULL);
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38 /* valid hash? */
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39 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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40 return err;
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41 }
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42 hmac->hash = hash;
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43 hashsize = hash_descriptor[hash].hashsize;
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45 /* valid key length? */
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46 if (keylen == 0) {
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47 return CRYPT_INVALID_KEYSIZE;
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48 }
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49
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50 /* allocate memory for key */
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51 hmac->key = XMALLOC(LTC_HMAC_BLOCKSIZE);
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52 if (hmac->key == NULL) {
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53 return CRYPT_MEM;
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54 }
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55
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56 /* (1) make sure we have a large enough key */
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57 if(keylen > LTC_HMAC_BLOCKSIZE) {
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58 z = LTC_HMAC_BLOCKSIZE;
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59 if ((err = hash_memory(hash, key, keylen, hmac->key, &z)) != CRYPT_OK) {
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60 goto LBL_ERR;
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61 }
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62 keylen = hashsize;
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63 } else {
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64 XMEMCPY(hmac->key, key, (size_t)keylen);
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65 }
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66
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67 if(keylen < LTC_HMAC_BLOCKSIZE) {
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68 zeromem((hmac->key) + keylen, (size_t)(LTC_HMAC_BLOCKSIZE - keylen));
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69 }
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70
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71 /* Create the initialization vector for step (3) */
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72 for(i=0; i < LTC_HMAC_BLOCKSIZE; i++) {
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73 buf[i] = hmac->key[i] ^ 0x36;
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74 }
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75
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76 /* Pre-pend that to the hash data */
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77 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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78 goto LBL_ERR;
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79 }
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80
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81 if ((err = hash_descriptor[hash].process(&hmac->md, buf, LTC_HMAC_BLOCKSIZE)) != CRYPT_OK) {
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82 goto LBL_ERR;
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83 }
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84 goto done;
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85 LBL_ERR:
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86 /* free the key since we failed */
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87 XFREE(hmac->key);
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88 done:
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89 #ifdef LTC_CLEAN_STACK
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90 zeromem(buf, LTC_HMAC_BLOCKSIZE);
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91 #endif
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92
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93 return err;
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94 }
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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96 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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97
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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98 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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99 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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100 /* commit time: $Format:%ai$ */