Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_done.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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11 /**
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12 @file hmac_done.c
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13 HMAC support, terminate stream, 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 Terminate an HMAC session
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22 @param hmac The HMAC state
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23 @param out [out] The destination of the HMAC authentication tag
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24 @param outlen [in/out] The max size and resulting size of the HMAC authentication tag
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25 @return CRYPT_OK if successful
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26 */
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27 int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen)
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28 {
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29 unsigned char buf[MAXBLOCKSIZE], isha[MAXBLOCKSIZE];
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30 unsigned long hashsize, i;
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31 int hash, err;
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32
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33 LTC_ARGCHK(hmac != NULL);
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34 LTC_ARGCHK(out != NULL);
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35
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36 /* test hash */
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37 hash = hmac->hash;
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38 if((err = hash_is_valid(hash)) != CRYPT_OK) {
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39 return err;
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40 }
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41
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42 /* get the hash message digest size */
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43 hashsize = hash_descriptor[hash].hashsize;
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44
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45 if ((err = hash_descriptor[hash].done(&hmac->md, isha)) != CRYPT_OK) {
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46 goto LBL_ERR;
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47 }
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48
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49 /* Create the second HMAC vector vector for step (3) */
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50 for(i=0; i < LTC_HMAC_BLOCKSIZE; i++) {
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51 buf[i] = hmac->key[i] ^ 0x5C;
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52 }
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53
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54 /* Now calculate the "outer" hash for step (5), (6), and (7) */
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55 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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56 goto LBL_ERR;
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57 }
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58 if ((err = hash_descriptor[hash].process(&hmac->md, buf, LTC_HMAC_BLOCKSIZE)) != CRYPT_OK) {
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59 goto LBL_ERR;
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60 }
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61 if ((err = hash_descriptor[hash].process(&hmac->md, isha, hashsize)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64 if ((err = hash_descriptor[hash].done(&hmac->md, buf)) != CRYPT_OK) {
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65 goto LBL_ERR;
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66 }
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67
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68 /* copy to output */
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69 for (i = 0; i < hashsize && i < *outlen; i++) {
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70 out[i] = buf[i];
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71 }
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72 *outlen = i;
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73
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74 err = CRYPT_OK;
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75 LBL_ERR:
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76 XFREE(hmac->key);
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77 #ifdef LTC_CLEAN_STACK
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78 zeromem(isha, hashsize);
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79 zeromem(buf, hashsize);
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80 zeromem(hmac, sizeof(*hmac));
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81 #endif
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82
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83 return err;
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84 }
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85
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86 #endif
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87
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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88 /* ref: $Format:%D$ */
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89 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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90 /* commit time: $Format:%ai$ */