1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ISCSI_CHAP_H_
3 #define _ISCSI_CHAP_H_
4 
5 #include <linux/types.h>
6 
7 #define CHAP_DIGEST_UNKNOWN	0
8 #define CHAP_DIGEST_MD5		5
9 #define CHAP_DIGEST_SHA1	6
10 #define CHAP_DIGEST_SHA256	7
11 #define CHAP_DIGEST_SHA3_256	8
12 
13 #define MAX_CHAP_CHALLENGE_LEN	32
14 #define CHAP_CHALLENGE_STR_LEN	4096
15 #define MAX_RESPONSE_LENGTH	128	/* sufficient for SHA3 256 */
16 #define	MAX_CHAP_N_SIZE		512
17 
18 #define MD5_SIGNATURE_SIZE	16	/* 16 bytes in a MD5 message digest */
19 #define SHA1_SIGNATURE_SIZE	20	/* 20 bytes in a SHA1 message digest */
20 #define SHA256_SIGNATURE_SIZE	32	/* 32 bytes in a SHA256 message digest */
21 #define SHA3_256_SIGNATURE_SIZE	32	/* 32 bytes in a SHA3 256 message digest */
22 
23 #define CHAP_STAGE_CLIENT_A	1
24 #define CHAP_STAGE_SERVER_AIC	2
25 #define CHAP_STAGE_CLIENT_NR	3
26 #define CHAP_STAGE_CLIENT_NRIC	4
27 #define CHAP_STAGE_SERVER_NR	5
28 
29 struct iscsi_node_auth;
30 struct iscsit_conn;
31 
32 extern u32 chap_main_loop(struct iscsit_conn *, struct iscsi_node_auth *, char *, char *,
33 				int *, int *);
34 
35 struct iscsi_chap {
36 	unsigned char	id;
37 	unsigned char	challenge[MAX_CHAP_CHALLENGE_LEN];
38 	unsigned int	challenge_len;
39 	unsigned char	*digest_name;
40 	unsigned int	digest_size;
41 	unsigned int	authenticate_target;
42 	unsigned int	chap_state;
43 } ____cacheline_aligned;
44 
45 #endif   /*** _ISCSI_CHAP_H_ ***/
46