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