Mercurial > dropbear

comparison libtomcrypt/src/mac/omac/omac_process.c @ 1435:f849a5ca2efc

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
update to libtomcrypt 1.17 (with Dropbear changes)
author Matt Johnston <matt@ucc.asn.au>
date Sat, 24 Jun 2017 17:50:50 +0800
parents 0cbe8f6dbf9e
children 6dba84798cd5
comparison
equal deleted inserted replaced
1434:27b9ddb06b09 1435:f849a5ca2efc
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 * 8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.com 9 * Tom St Denis, [email protected], http://libtom.org
10 */ 10 */
11 #include "tomcrypt.h" 11 #include "tomcrypt.h"
12 12
13 /** 13 /**
14 @file omac_process.c 14 @file omac_process.c
15 OMAC1 support, process data, Tom St Denis 15 LTC_OMAC1 support, process data, Tom St Denis
16 */ 16 */
17 17
18 18
19 #ifdef LTC_OMAC 19 #ifdef LTC_OMAC
20 20
21 /** 21 /**
22 Process data through OMAC 22 Process data through LTC_OMAC
23 @param omac The OMAC state 23 @param omac The LTC_OMAC state
24 @param in The input data to send through OMAC 24 @param in The input data to send through LTC_OMAC
25 @param inlen The length of the input (octets) 25 @param inlen The length of the input (octets)
26 @return CRYPT_OK if successful 26 @return CRYPT_OK if successful
27 */ 27 */
28 int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen) 28 int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen)
29 { 29 {
30 unsigned long n, x; 30 unsigned long n, x, blklen;
31 int err; 31 int err;
32 32
33 LTC_ARGCHK(omac != NULL); 33 LTC_ARGCHK(omac != NULL);
34 LTC_ARGCHK(in != NULL); 34 LTC_ARGCHK(in != NULL);
35 if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) { 35 if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) {
40 (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) { 40 (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) {
41 return CRYPT_INVALID_ARG; 41 return CRYPT_INVALID_ARG;
42 } 42 }
43 43
44 #ifdef LTC_FAST 44 #ifdef LTC_FAST
45 if (omac->buflen == 0 && inlen > 16) { 45 blklen = cipher_descriptor[omac->cipher_idx].block_length;
46 int y; 46 if (omac->buflen == 0 && inlen > blklen) {
47 for (x = 0; x < (inlen - 16); x += 16) { 47 unsigned long y;
48 for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) { 48 for (x = 0; x < (inlen - blklen); x += blklen) {
49 for (y = 0; y < blklen; y += sizeof(LTC_FAST_TYPE)) {
49 *((LTC_FAST_TYPE*)(&omac->prev[y])) ^= *((LTC_FAST_TYPE*)(&in[y])); 50 *((LTC_FAST_TYPE*)(&omac->prev[y])) ^= *((LTC_FAST_TYPE*)(&in[y]));
50 } 51 }
51 in += 16; 52 in += blklen;
52 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->prev, omac->prev, &omac->key)) != CRYPT_OK) { 53 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->prev, omac->prev, &omac->key)) != CRYPT_OK) {
53 return err; 54 return err;
54 } 55 }
55 } 56 }
56 inlen -= x; 57 inlen -= x;
81 } 82 }
82 83
83 #endif 84 #endif
84 85
85 86
86 /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_process.c,v $ */ 87 /* $Source$ */
87 /* $Revision: 1.9 $ */ 88 /* $Revision$ */
88 /* $Date: 2006/11/03 00:39:49 $ */ 89 /* $Date$ */