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#include <u.h>
#include <libc.h>
#include <authsrv.h>
#include <libsec.h>
extern int form1B2M(char *ap, int n, uchar key[32]);
int
convT2M(Ticket *f, char *ap, int n, Authkey *key)
{
uchar *p;
if(n < 1+CHALLEN+2*ANAMELEN)
return 0;
p = (uchar*)ap;
*p++ = f->num;
memmove(p, f->chal, CHALLEN), p += CHALLEN;
memmove(p, f->cuid, ANAMELEN), p += ANAMELEN;
memmove(p, f->suid, ANAMELEN), p += ANAMELEN;
switch(f->form){
case 0:
if(n < 1+CHALLEN+2*ANAMELEN+DESKEYLEN)
return 0;
memmove(p, f->key, DESKEYLEN), p += DESKEYLEN;
n = p - (uchar*)ap;
encrypt(key->des, ap, n);
return n;
case 1:
if(n < 12+CHALLEN+2*ANAMELEN+NONCELEN+16)
return 0;
memmove(p, f->key, NONCELEN), p += NONCELEN;
return form1B2M(ap, p - (uchar*)ap, key->pakkey);
}
return 0;
}
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