/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ISCSI_CHAP_H_
#define _ISCSI_CHAP_H_

#include <linux/types.h>

#define CHAP_DIGEST_UNKNOWN     0
#define CHAP_DIGEST_MD5         5
#define CHAP_DIGEST_SHA1        6
#define CHAP_DIGEST_SHA256      7
#define CHAP_DIGEST_SHA3_256    8

#define MAX_CHAP_CHALLENGE_LEN  32
#define CHAP_CHALLENGE_STR_LEN  4096
#define MAX_RESPONSE_LENGTH     128     /* sufficient for SHA3 256 */
#define MAX_CHAP_N_SIZE         512

#define MD5_SIGNATURE_SIZE      16      /* 16 bytes in a MD5 message digest */
#define SHA1_SIGNATURE_SIZE     20      /* 20 bytes in a SHA1 message digest */
#define SHA256_SIGNATURE_SIZE   32      /* 32 bytes in a SHA256 message digest */
#define SHA3_256_SIGNATURE_SIZE 32      /* 32 bytes in a SHA3 256 message digest */

#define CHAP_STAGE_CLIENT_A     1
#define CHAP_STAGE_SERVER_AIC   2
#define CHAP_STAGE_CLIENT_NR    3
#define CHAP_STAGE_CLIENT_NRIC  4
#define CHAP_STAGE_SERVER_NR    5

struct iscsi_node_auth;
struct iscsit_conn;

extern u32 chap_main_loop(struct iscsit_conn *, struct iscsi_node_auth *, char *, char *,
                                int *, int *);

struct iscsi_chap {
        unsigned char   id;
        unsigned char   challenge[MAX_CHAP_CHALLENGE_LEN];
        unsigned int    challenge_len;
        unsigned char   *digest_name;
        unsigned int    digest_size;
        unsigned int    authenticate_target;
        unsigned int    chap_state;
} ____cacheline_aligned;

#endif   /*** _ISCSI_CHAP_H_ ***/