Mercurial > dropbear

annotate libtomcrypt/src/mac/f9/f9_init.c @ 1861:2b3a8026a6ce

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Add re-exec for server This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
author Matt Johnston <matt@ucc.asn.au>
date Sun, 30 Jan 2022 10:14:56 +0800
parents 6dba84798cd5
children
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rev   line source
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_init.c
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13 F9 Support, start an F9 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 /** Initialize F9-MAC state
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19 @param f9 [out] f9 state to initialize
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20 @param cipher Index of cipher to use
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21 @param key [in] Secret key
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22 @param keylen Length of secret key in octets
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23 Return CRYPT_OK on success
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24 */
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25 int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen)
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26 {
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27 int x, err;
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28
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29 LTC_ARGCHK(f9 != NULL);
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30 LTC_ARGCHK(key != NULL);
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31
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32 /* schedule the key */
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33 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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34 return err;
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35 }
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36
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37 #ifdef LTC_FAST
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38 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) {
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39 return CRYPT_INVALID_ARG;
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40 }
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41 #endif
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42
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43 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &f9->key)) != CRYPT_OK) {
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44 goto done;
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45 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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46
382
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47 /* make the second key */
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48 for (x = 0; (unsigned)x < keylen; x++) {
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49 f9->akey[x] = key[x] ^ 0xAA;
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50 }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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51
382
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52 /* setup struct */
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53 zeromem(f9->IV, cipher_descriptor[cipher].block_length);
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54 zeromem(f9->ACC, cipher_descriptor[cipher].block_length);
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55 f9->blocksize = cipher_descriptor[cipher].block_length;
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56 f9->cipher = cipher;
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57 f9->buflen = 0;
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58 f9->keylen = keylen;
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59 done:
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60 return err;
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61 }
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62
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63 #endif
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64
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
65 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
66 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
67 /* commit time: $Format:%ai$ */
382
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68