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annotate libtomcrypt/src/encauth/ocb3/ocb3_add_aad.c @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +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: $Format:%ai$ */