Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb/ocb_encrypt_authenticate_memory.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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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10 /**
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11 @file ocb_encrypt_authenticate_memory.c
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12 OCB implementation, encrypt block of memory, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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16 #ifdef LTC_OCB_MODE
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17
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18 /**
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19 Encrypt and generate an authentication code for a buffer of memory
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20 @param cipher The index of the cipher desired
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21 @param key The secret key
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22 @param keylen The length of the secret key (octets)
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23 @param nonce The session nonce (length of the block ciphers block size)
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24 @param pt The plaintext
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25 @param ptlen The length of the plaintext (octets)
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26 @param ct [out] The ciphertext
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27 @param tag [out] The authentication tag
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28 @param taglen [in/out] The max size and resulting size of the authentication tag
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29 @return CRYPT_OK if successful
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30 */
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31 int ocb_encrypt_authenticate_memory(int cipher,
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32 const unsigned char *key, unsigned long keylen,
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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33 const unsigned char *nonce,
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34 const unsigned char *pt, unsigned long ptlen,
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35 unsigned char *ct,
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36 unsigned char *tag, unsigned long *taglen)
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37 {
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38 int err;
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39 ocb_state *ocb;
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40
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41 LTC_ARGCHK(key != NULL);
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42 LTC_ARGCHK(nonce != NULL);
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43 LTC_ARGCHK(pt != NULL);
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44 LTC_ARGCHK(ct != NULL);
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45 LTC_ARGCHK(tag != NULL);
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46 LTC_ARGCHK(taglen != NULL);
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47
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48 /* allocate ram */
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49 ocb = XMALLOC(sizeof(ocb_state));
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50 if (ocb == NULL) {
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51 return CRYPT_MEM;
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52 }
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53
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54 if ((err = ocb_init(ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
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55 goto LBL_ERR;
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56 }
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57
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58 while (ptlen > (unsigned long)ocb->block_len) {
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59 if ((err = ocb_encrypt(ocb, pt, ct)) != CRYPT_OK) {
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60 goto LBL_ERR;
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61 }
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62 ptlen -= ocb->block_len;
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63 pt += ocb->block_len;
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64 ct += ocb->block_len;
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65 }
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66
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67 err = ocb_done_encrypt(ocb, pt, ptlen, ct, tag, taglen);
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68 LBL_ERR:
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69 #ifdef LTC_CLEAN_STACK
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70 zeromem(ocb, sizeof(ocb_state));
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71 #endif
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72
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73 XFREE(ocb);
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74
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75 return err;
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76 }
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77
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78 #endif
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79
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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80 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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81 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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82 /* commit time: $Format:%ai$ */