Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_done.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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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 omac_done.c
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13 OMAC1 support, terminate a stream, Tom St Denis
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14 */
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15
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16 #ifdef LTC_OMAC
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18 /**
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19 Terminate an OMAC stream
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20 @param omac The OMAC state
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21 @param out [out] Destination for the authentication tag
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22 @param outlen [in/out] The max size and resulting size of the authentication tag
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23 @return CRYPT_OK if successful
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24 */
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25 int omac_done(omac_state *omac, unsigned char *out, unsigned long *outlen)
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26 {
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27 int err, mode;
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28 unsigned x;
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30 LTC_ARGCHK(omac != NULL);
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31 LTC_ARGCHK(out != NULL);
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32 LTC_ARGCHK(outlen != NULL);
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33 if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) {
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34 return err;
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35 }
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37 if ((omac->buflen > (int)sizeof(omac->block)) || (omac->buflen < 0) ||
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38 (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) {
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39 return CRYPT_INVALID_ARG;
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40 }
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42 /* figure out mode */
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43 if (omac->buflen != omac->blklen) {
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44 /* add the 0x80 byte */
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45 omac->block[omac->buflen++] = 0x80;
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46
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47 /* pad with 0x00 */
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48 while (omac->buflen < omac->blklen) {
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49 omac->block[omac->buflen++] = 0x00;
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50 }
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51 mode = 1;
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52 } else {
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53 mode = 0;
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54 }
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55
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56 /* now xor prev + Lu[mode] */
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57 for (x = 0; x < (unsigned)omac->blklen; x++) {
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58 omac->block[x] ^= omac->prev[x] ^ omac->Lu[mode][x];
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59 }
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61 /* encrypt it */
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62 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->block, omac->block, &omac->key)) != CRYPT_OK) {
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63 return err;
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64 }
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65 cipher_descriptor[omac->cipher_idx].done(&omac->key);
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66
285
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67 /* output it */
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68 for (x = 0; x < (unsigned)omac->blklen && x < *outlen; x++) {
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69 out[x] = omac->block[x];
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70 }
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71 *outlen = x;
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72
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73 #ifdef LTC_CLEAN_STACK
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74 zeromem(omac, sizeof(*omac));
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75 #endif
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76 return CRYPT_OK;
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77 }
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79 #endif
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81
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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83 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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84 /* commit time: $Format:%ai$ */