#pragma	lib	"libauth.a" typedef struct	Ticket		Ticket;typedef struct	Ticketreq	Ticketreq;typedef struct	Authenticator	Authenticator;typedef struct	Nvrsafe		Nvrsafe;typedef struct	Passwordreq	Passwordreq;typedef struct	Chalstate	Chalstate; enum{	DOMLEN=		48,		/* length of an authentication domain name */	DESKEYLEN=	7,		/* length of a des key for encrypt/decrypt */	CHALLEN=	8,		/* length of a challenge */	NETCHLEN=	16,		/* max network challenge length	*/	CONFIGLEN=	14, 	KEYDBLEN=	NAMELEN+DESKEYLEN+4+2}; /* encryption numberings (anti-replay) */enum{	AuthTreq=1,	/* ticket request */	AuthChal=2,	/* challenge box request */	AuthPass=3,	/* change password */	AuthMod=6,	/* modify user */ 	AuthOK=4,	/* reply follows */	AuthErr=5,	/* error follows */ 	AuthTs=64,	/* ticket encrypted with server's key */	AuthTc,		/* ticket encrypted with client's key */	AuthAs,		/* server generated authenticator */	AuthAc,		/* client generated authenticator */}; struct Ticketreq{	char	type;	char	authid[NAMELEN];	/* server's encryption id */	char	authdom[DOMLEN];	/* server's authentication domain */	char	chal[CHALLEN];		/* challenge from server */	char	hostid[NAMELEN];	/* host's encryption id */	char	uid[NAMELEN];		/* uid of requesting user on host */};#define	TICKREQLEN	(3*NAMELEN+CHALLEN+DOMLEN+1) struct Ticket{	char	num;			/* replay protection */	char	chal[CHALLEN];		/* server challenge */	char	cuid[NAMELEN];		/* uid on client */	char	suid[NAMELEN];		/* uid on server */	char	key[DESKEYLEN];		/* nonce DES key */};#define	TICKETLEN	(CHALLEN+2*NAMELEN+DESKEYLEN+1) struct Authenticator{	char	num;			/* replay protection */	char	chal[CHALLEN];	ulong	id;			/* authenticator id, ++'d with each auth */};#define	AUTHENTLEN	(CHALLEN+4+1) struct Passwordreq{	char	num;	char	old[NAMELEN];	char	new[NAMELEN];};#define	PASSREQLEN	(2*NAMELEN+1) struct Nvrsafe{	char	machkey[DESKEYLEN];	uchar	machsum;	char	authkey[DESKEYLEN];	uchar	authsum;	char	config[CONFIGLEN];	uchar	configsum;	char	authid[NAMELEN];	uchar	authidsum;	char	authdom[DOMLEN];	uchar	authdomsum;}; struct Chalstate{	int	afd;			/* /dev/authenticate */	int	asfd;			/* authdial() */	char	chal[NETCHLEN];		/* challenge/response */}; extern	int	convT2M(Ticket*, char*, char*);extern	void	convM2T(char*, Ticket*, char*);extern	int	convA2M(Authenticator*, char*, char*);extern	void	convM2A(char*, Authenticator*, char*);extern	int	convTR2M(Ticketreq*, char*);extern	void	convM2TR(char*, Ticketreq*);extern	int	convPR2M(Passwordreq*, char*, char*);extern	void	convM2PR(char*, Passwordreq*, char*);extern	uchar	nvcsum(void*, int);extern	int	opasstokey(void*, char*);extern	int	passtokey(void*, char*);extern	int	authenticate(int, int);extern	int	newns(char*, char*);extern	int	authdial(void);extern	int	auth(int);extern	int	srvauth(int, char*);extern	int	getchal(Chalstate*, char*);extern	int	chalreply(Chalstate*, char*);extern	int	amount(int, char*, int, char*);