Mercurial > dropbear

annotate libtomcrypt/src/mac/f9/f9_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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382
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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 f9_done.c
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13 f9 Support, terminate the state
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14 */
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15
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16 #ifdef LTC_F9_MODE
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17
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18 /** Terminate the f9-MAC state
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19 @param f9 f9 state to terminate
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20 @param out [out] Destination for the MAC tag
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21 @param outlen [in/out] Destination size and final tag size
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22 Return CRYPT_OK on success
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23 */
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24 int f9_done(f9_state *f9, unsigned char *out, unsigned long *outlen)
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25 {
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26 int err, x;
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27 LTC_ARGCHK(f9 != NULL);
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28 LTC_ARGCHK(out != NULL);
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29
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30 /* check structure */
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31 if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) {
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32 return err;
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33 }
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34
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35 if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) ||
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36 (f9->buflen > f9->blocksize) || (f9->buflen < 0)) {
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37 return CRYPT_INVALID_ARG;
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38 }
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39
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40 if (f9->buflen != 0) {
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41 /* encrypt */
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42 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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43 f9->buflen = 0;
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44 for (x = 0; x < f9->blocksize; x++) {
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45 f9->ACC[x] ^= f9->IV[x];
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46 }
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47 }
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48
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49 /* schedule modified key */
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50 if ((err = cipher_descriptor[f9->cipher].setup(f9->akey, f9->keylen, 0, &f9->key)) != CRYPT_OK) {
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51 return err;
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52 }
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53
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54 /* encrypt the ACC */
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55 cipher_descriptor[f9->cipher].ecb_encrypt(f9->ACC, f9->ACC, &f9->key);
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56 cipher_descriptor[f9->cipher].done(&f9->key);
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57
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58 /* extract tag */
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59 for (x = 0; x < f9->blocksize && (unsigned long)x < *outlen; x++) {
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60 out[x] = f9->ACC[x];
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61 }
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62 *outlen = x;
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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63
382
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64 #ifdef LTC_CLEAN_STACK
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65 zeromem(f9, sizeof(*f9));
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66 #endif
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67 return CRYPT_OK;
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68 }
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69
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70 #endif
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71
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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72 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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73 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 /* commit time: $Format:%ai$ */
382
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75