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#include <u.h>
#include <libc.h>
#include <authsrv.h>
#define CHAR(x) f->x = *p++
#define SHORT(x) f->x = (p[0] | (p[1]<<8)); p += 2
#define VLONG(q) q = (p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24)); p += 4
#define LONG(x) VLONG(f->x)
#define STRING(x,n) memmove(f->x, p, n); p += n
int
convM2A(char *ap, int n, Authenticator *f, Ticket *t)
{
uchar *p, buf[AUTHENTLEN];
memset(f, 0, sizeof(Authenticator));
if(n < AUTHENTLEN)
return -AUTHENTLEN;
if(t) {
memmove(buf, ap, AUTHENTLEN);
ap = (char*)buf;
decrypt(t->key, ap, AUTHENTLEN);
}
p = (uchar*)ap;
CHAR(num);
STRING(chal, CHALLEN);
LONG(id);
n = p - (uchar*)ap;
return n;
}
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