1 #ifndef _ISCSI_CHAP_H_
2 #define _ISCSI_CHAP_H_
3 
4 #include <linux/types.h>
5 
6 #define CHAP_DIGEST_UNKNOWN	0
7 #define CHAP_DIGEST_MD5		5
8 #define CHAP_DIGEST_SHA		6
9 
10 #define CHAP_CHALLENGE_LENGTH	16
11 #define CHAP_CHALLENGE_STR_LEN	4096
12 #define MAX_RESPONSE_LENGTH	64	/* sufficient for MD5 */
13 #define	MAX_CHAP_N_SIZE		512
14 
15 #define MD5_SIGNATURE_SIZE	16	/* 16 bytes in a MD5 message digest */
16 
17 #define CHAP_STAGE_CLIENT_A	1
18 #define CHAP_STAGE_SERVER_AIC	2
19 #define CHAP_STAGE_CLIENT_NR	3
20 #define CHAP_STAGE_CLIENT_NRIC	4
21 #define CHAP_STAGE_SERVER_NR	5
22 
23 struct iscsi_node_auth;
24 struct iscsi_conn;
25 
26 extern u32 chap_main_loop(struct iscsi_conn *, struct iscsi_node_auth *, char *, char *,
27 				int *, int *);
28 
29 struct iscsi_chap {
30 	unsigned char	digest_type;
31 	unsigned char	id;
32 	unsigned char	challenge[CHAP_CHALLENGE_LENGTH];
33 	unsigned int	authenticate_target;
34 	unsigned int	chap_state;
35 } ____cacheline_aligned;
36 
37 #endif   /*** _ISCSI_CHAP_H_ ***/
38