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#include <u.h>
#include <libc.h>
#include <authsrv.h>
extern int form1B2M(char *ap, int n, uchar key[32]);
int
convA2M(Authenticator *f, char *ap, int n, Ticket *t)
{
uchar *p;
if(n < 1+CHALLEN)
return 0;
p = (uchar*)ap;
*p++ = f->num;
memmove(p, f->chal, CHALLEN), p += CHALLEN;
switch(t->form){
case 0:
if(n < 1+CHALLEN+4)
return 0;
memset(p, 0, 4), p += 4; /* unused id field */
n = p - (uchar*)ap;
encrypt(t->key, ap, n);
return n;
case 1:
if(n < 12+CHALLEN+NONCELEN+16)
return 0;
memmove(p, f->rand, NONCELEN), p += NONCELEN;
return form1B2M(ap, (char*)p - ap, t->key);
}
return 0;
}
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