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annotate libtomcrypt/src/encauth/ocb3/ocb3_add_aad.c @ 1552:e46f7f1da56a

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CHANGES for 2018.76
author Matt Johnston <matt@ucc.asn.au>
date Tue, 27 Feb 2018 22:14:04 +0800
parents 6dba84798cd5
children
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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: $Format:%ai$ */