37 lines
649 B
C
37 lines
649 B
C
#include <u.h>
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#include <lib9.h>
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#include <authsrv.h>
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extern int form1M2B(char *ap, int n, uint8_t key[32]);
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int
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convM2A(char *ap, int n, Authenticator *f, Ticket *t)
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{
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uint8_t buf[MAXAUTHENTLEN], *p;
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int m;
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memset(f, 0, sizeof(Authenticator));
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if(t->form == 0){
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m = 1+CHALLEN+4;
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if(n < m)
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return -m;
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memmove(buf, ap, m);
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decrypt(t->key, buf, m);
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} else {
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m = 12+CHALLEN+NONCELEN+16;
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if(n < m)
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return -m;
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memmove(buf, ap, m);
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if(form1M2B((char*)buf, m, t->key) < 0)
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return m;
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}
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p = buf;
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f->num = *p++;
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memmove(f->chal, p, CHALLEN);
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p += CHALLEN;
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if(t->form == 1)
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memmove(f->rand, p, NONCELEN);
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return m;
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}
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