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annotate libtomcrypt/src/encauth/ocb3/ocb3_add_aad.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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: $Format:%ai$ */