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annotate libtomcrypt/src/encauth/ocb3/ocb3_add_aad.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
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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_add_aad.c
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12 OCB implementation, add AAD data, by Karel Miko
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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 Add one block of AAD data (internal function)
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20 @param ocb The OCB state
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21 @param aad_block [in] AAD data (block_len size)
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22 @return CRYPT_OK if successful
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23 */
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24 static int _ocb3_int_aad_add_block(ocb3_state *ocb, const unsigned char *aad_block)
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25 {
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26 unsigned char tmp[MAXBLOCKSIZE];
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27 int err;
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28
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29 /* Offset_i = Offset_{i-1} xor L_{ntz(i)} */
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30 ocb3_int_xor_blocks(ocb->aOffset_current, ocb->aOffset_current, ocb->L_[ocb3_int_ntz(ocb->ablock_index)], ocb->block_len);
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31
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32 /* Sum_i = Sum_{i-1} xor ENCIPHER(K, A_i xor Offset_i) */
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33 ocb3_int_xor_blocks(tmp, aad_block, ocb->aOffset_current, ocb->block_len);
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34 if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, tmp, &ocb->key)) != CRYPT_OK) {
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35 return err;
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36 }
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37 ocb3_int_xor_blocks(ocb->aSum_current, ocb->aSum_current, tmp, ocb->block_len);
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38
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39 ocb->ablock_index++;
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40
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41 return CRYPT_OK;
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42 }
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43
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44 /**
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45 Add AAD - additional associated data
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46 @param ocb The OCB state
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47 @param aad The AAD data
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48 @param aadlen The size of AAD data (octets)
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49 @return CRYPT_OK if successful
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50 */
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51 int ocb3_add_aad(ocb3_state *ocb, const unsigned char *aad, unsigned long aadlen)
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52 {
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53 int err, x, full_blocks, full_blocks_len, last_block_len;
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54 unsigned char *data;
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55 unsigned long datalen, l;
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56
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57 LTC_ARGCHK(ocb != NULL);
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58 if (aadlen == 0) return CRYPT_OK;
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59 LTC_ARGCHK(aad != NULL);
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60
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61 if (ocb->adata_buffer_bytes > 0) {
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62 l = ocb->block_len - ocb->adata_buffer_bytes;
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63 if (l > aadlen) l = aadlen;
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64 XMEMCPY(ocb->adata_buffer+ocb->adata_buffer_bytes, aad, l);
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65 ocb->adata_buffer_bytes += l;
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66
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67 if (ocb->adata_buffer_bytes == ocb->block_len) {
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68 if ((err = _ocb3_int_aad_add_block(ocb, ocb->adata_buffer)) != CRYPT_OK) {
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69 return err;
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70 }
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71 ocb->adata_buffer_bytes = 0;
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72 }
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73
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74 data = (unsigned char *)aad + l;
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75 datalen = aadlen - l;
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76 }
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77 else {
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78 data = (unsigned char *)aad;
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79 datalen = aadlen;
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80 }
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81
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82 if (datalen == 0) return CRYPT_OK;
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83
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84 full_blocks = datalen/ocb->block_len;
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85 full_blocks_len = full_blocks * ocb->block_len;
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86 last_block_len = datalen - full_blocks_len;
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87
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88 for (x=0; x<full_blocks; x++) {
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89 if ((err = _ocb3_int_aad_add_block(ocb, data+x*ocb->block_len)) != CRYPT_OK) {
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90 return err;
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91 }
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92 }
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93
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94 if (last_block_len>0) {
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95 XMEMCPY(ocb->adata_buffer, data+full_blocks_len, last_block_len);
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96 ocb->adata_buffer_bytes = last_block_len;
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97 }
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98
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99 return CRYPT_OK;
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100 }
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101
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102 #endif
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103
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104 /* ref: $Format:%D$ */
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105 /* git commit: $Format:%H$ */
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106 /* commit time: $Format:%ai$ */