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comparison libtomcrypt/src/mac/omac/omac_process.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
parents f849a5ca2efc
children
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1470:8bba51a55704 1471:6dba84798cd5
3 * LibTomCrypt is a library that provides various cryptographic 3 * LibTomCrypt is a library that provides various cryptographic
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 *
9 * Tom St Denis, [email protected], http://libtom.org
10 */ 8 */
11 #include "tomcrypt.h" 9 #include "tomcrypt.h"
12 10
13 /** 11 /**
14 @file omac_process.c 12 @file omac_process.c
15 LTC_OMAC1 support, process data, Tom St Denis 13 OMAC1 support, process data, Tom St Denis
16 */ 14 */
17 15
18 16
19 #ifdef LTC_OMAC 17 #ifdef LTC_OMAC
20 18
21 /** 19 /**
22 Process data through LTC_OMAC 20 Process data through OMAC
23 @param omac The LTC_OMAC state 21 @param omac The OMAC state
24 @param in The input data to send through LTC_OMAC 22 @param in The input data to send through OMAC
25 @param inlen The length of the input (octets) 23 @param inlen The length of the input (octets)
26 @return CRYPT_OK if successful 24 @return CRYPT_OK if successful
27 */ 25 */
28 int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen) 26 int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen)
29 { 27 {
30 unsigned long n, x, blklen; 28 unsigned long n, x;
31 int err; 29 int err;
32 30
33 LTC_ARGCHK(omac != NULL); 31 LTC_ARGCHK(omac != NULL);
34 LTC_ARGCHK(in != NULL); 32 LTC_ARGCHK(in != NULL);
35 if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) { 33 if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) {
40 (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) { 38 (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) {
41 return CRYPT_INVALID_ARG; 39 return CRYPT_INVALID_ARG;
42 } 40 }
43 41
44 #ifdef LTC_FAST 42 #ifdef LTC_FAST
45 blklen = cipher_descriptor[omac->cipher_idx].block_length; 43 {
46 if (omac->buflen == 0 && inlen > blklen) { 44 unsigned long blklen = cipher_descriptor[omac->cipher_idx].block_length;
47 unsigned long y; 45
48 for (x = 0; x < (inlen - blklen); x += blklen) { 46 if (omac->buflen == 0 && inlen > blklen) {
49 for (y = 0; y < blklen; y += sizeof(LTC_FAST_TYPE)) { 47 unsigned long y;
50 *((LTC_FAST_TYPE*)(&omac->prev[y])) ^= *((LTC_FAST_TYPE*)(&in[y])); 48 for (x = 0; x < (inlen - blklen); x += blklen) {
51 } 49 for (y = 0; y < blklen; y += sizeof(LTC_FAST_TYPE)) {
52 in += blklen; 50 *(LTC_FAST_TYPE_PTR_CAST(&omac->prev[y])) ^= *(LTC_FAST_TYPE_PTR_CAST(&in[y]));
53 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->prev, omac->prev, &omac->key)) != CRYPT_OK) { 51 }
54 return err; 52 in += blklen;
55 } 53 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->prev, omac->prev, &omac->key)) != CRYPT_OK) {
56 } 54 return err;
57 inlen -= x; 55 }
58 } 56 }
57 inlen -= x;
58 }
59 }
59 #endif 60 #endif
60 61
61 while (inlen != 0) { 62 while (inlen != 0) {
62 /* ok if the block is full we xor in prev, encrypt and replace prev */ 63 /* ok if the block is full we xor in prev, encrypt and replace prev */
63 if (omac->buflen == omac->blklen) { 64 if (omac->buflen == omac->blklen) {
64 for (x = 0; x < (unsigned long)omac->blklen; x++) { 65 for (x = 0; x < (unsigned long)omac->blklen; x++) {
65 omac->block[x] ^= omac->prev[x]; 66 omac->block[x] ^= omac->prev[x];
66 } 67 }
82 } 83 }
83 84
84 #endif 85 #endif
85 86
86 87
87 /* $Source$ */ 88 /* ref: $Format:%D$ */
88 /* $Revision$ */ 89 /* git commit: $Format:%H$ */
89 /* $Date$ */ 90 /* commit time: $Format:%ai$ */