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#include <u.h>
#include <libc.h>
#include <authsrv.h>
extern int form1M2B(char *ap, int n, uchar key[32]);
int
convM2A(char *ap, int n, Authenticator *f, Ticket *t)
{
uchar buf[MAXAUTHENTLEN], *p;
int m;
memset(f, 0, sizeof(Authenticator));
if(t->form == 0){
m = 1+CHALLEN+4;
if(n < m)
return -m;
memmove(buf, ap, m);
decrypt(t->key, buf, m);
} else {
m = 12+CHALLEN+NONCELEN+16;
if(n < m)
return -m;
memmove(buf, ap, m);
if(form1M2B((char*)buf, m, t->key) < 0)
return m;
}
p = buf;
f->num = *p++;
memmove(f->chal, p, CHALLEN);
p += CHALLEN;
if(t->form == 1)
memmove(f->rand, p, NONCELEN);
return m;
}
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