#include <u.h>#include <libc.h>#include <authsrv.h> extern int form1check(char *ap, int n);extern int form1M2B(char *ap, int n, uchar key[32]); intconvM2T(char *ap, int n, Ticket *f, Authkey *k){	uchar buf[MAXTICKETLEN], *p;	int m; 	if(f != nil)		memset(f, 0, sizeof(Ticket)); 	if(n < 8)		return -8; 	if(form1check(ap, n) < 0){		m = 1+CHALLEN+2*ANAMELEN+DESKEYLEN;		if(n < m)			return -m;		if(f == nil || k == nil)			return m;		f->form = 0;		memmove(buf, ap, m);		decrypt(k->des, buf, m);	} else {		m = 12+CHALLEN+2*ANAMELEN+NONCELEN+16;		if(n < m)			return -m;		if(f == nil || k == nil)			return m;		f->form = 1;		memmove(buf, ap, m);		if(form1M2B((char*)buf, m, k->pakkey) < 0)			return m;	}	p = buf;	f->num = *p++;	memmove(f->chal, p, CHALLEN), p += CHALLEN;	memmove(f->cuid, p, ANAMELEN), p += ANAMELEN;	memmove(f->suid, p, ANAMELEN), p += ANAMELEN;	memmove(f->key, p, f->form == 0 ? DESKEYLEN : NONCELEN); 	f->cuid[ANAMELEN-1] = 0;	f->suid[ANAMELEN-1] = 0; 	return m;}