Mercurial > dropbear

annotate libtomcrypt/src/encauth/ocb3/ocb3_encrypt.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
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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
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10 /**
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11 @file ocb3_encrypt.c
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12 OCB implementation, encrypt data, by Tom St Denis
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13 */
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14 #include "tomcrypt.h"
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15
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16 #ifdef LTC_OCB3_MODE
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17
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18 /**
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19 Encrypt blocks of data with OCB
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20 @param ocb The OCB state
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21 @param pt The plaintext (length multiple of the block size of the block cipher)
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22 @param ptlen The length of the input (octets)
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23 @param ct [out] The ciphertext (same size as the pt)
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24 @return CRYPT_OK if successful
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25 */
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26 int ocb3_encrypt(ocb3_state *ocb, const unsigned char *pt, unsigned long ptlen, unsigned char *ct)
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27 {
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28 unsigned char tmp[MAXBLOCKSIZE];
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29 int err, i, full_blocks;
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30 unsigned char *pt_b, *ct_b;
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31
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32 LTC_ARGCHK(ocb != NULL);
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33 if (ptlen == 0) return CRYPT_OK; /* no data, nothing to do */
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34 LTC_ARGCHK(pt != NULL);
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35 LTC_ARGCHK(ct != NULL);
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36
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37 if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) {
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38 return err;
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39 }
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40 if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) {
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41 return CRYPT_INVALID_ARG;
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42 }
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43
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44 if (ptlen % ocb->block_len) { /* ptlen has to bu multiple of block_len */
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45 return CRYPT_INVALID_ARG;
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46 }
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47
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48 full_blocks = ptlen/ocb->block_len;
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49 for(i=0; i<full_blocks; i++) {
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50 pt_b = (unsigned char *)pt+i*ocb->block_len;
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51 ct_b = (unsigned char *)ct+i*ocb->block_len;
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52
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53 /* ocb->Offset_current[] = ocb->Offset_current[] ^ Offset_{ntz(block_index)} */
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54 ocb3_int_xor_blocks(ocb->Offset_current, ocb->Offset_current, ocb->L_[ocb3_int_ntz(ocb->block_index)], ocb->block_len);
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55
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56 /* tmp[] = pt[] XOR ocb->Offset_current[] */
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57 ocb3_int_xor_blocks(tmp, pt_b, ocb->Offset_current, ocb->block_len);
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58
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59 /* encrypt */
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60 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, tmp, &ocb->key)) != CRYPT_OK) {
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61 goto LBL_ERR;
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62 }
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63
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64 /* ct[] = tmp[] XOR ocb->Offset_current[] */
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65 ocb3_int_xor_blocks(ct_b, tmp, ocb->Offset_current, ocb->block_len);
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66
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67 /* ocb->checksum[] = ocb->checksum[] XOR pt[] */
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68 ocb3_int_xor_blocks(ocb->checksum, ocb->checksum, pt_b, ocb->block_len);
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69
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70 ocb->block_index++;
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71 }
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72
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73 err = CRYPT_OK;
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74
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75 LBL_ERR:
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76 #ifdef LTC_CLEAN_STACK
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77 zeromem(tmp, sizeof(tmp));
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78 #endif
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79 return err;
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80 }
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81
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82 #endif
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83
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84 /* ref: $Format:%D$ */
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85 /* git commit: $Format:%H$ */
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86 /* commit time: $Format:%ai$ */