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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/decrypt_tk.c */
/*
* Copyright 1990 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "k5-int.h"
/*
Decrypts dec_ticket->enc_part
using *srv_key, and places result in dec_ticket->enc_part2.
The storage of dec_ticket->enc_part2 will be allocated before return.
returns errors from encryption routines, system errors
*/
krb5_error_code KRB5_CALLCONV
krb5_decrypt_tkt_part(krb5_context context, const krb5_keyblock *srv_key, register krb5_ticket *ticket)
{
krb5_enc_tkt_part *dec_tkt_part;
krb5_data scratch;
krb5_error_code retval;
if (!krb5_c_valid_enctype(ticket->enc_part.enctype))
return KRB5_PROG_ETYPE_NOSUPP;
if (!krb5_is_permitted_enctype(context, ticket->enc_part.enctype))
return KRB5_NOPERM_ETYPE;
scratch.length = ticket->enc_part.ciphertext.length;
if (!(scratch.data = malloc(ticket->enc_part.ciphertext.length)))
return(ENOMEM);
/* call the encryption routine */
if ((retval = krb5_c_decrypt(context, srv_key,
KRB5_KEYUSAGE_KDC_REP_TICKET, 0,
&ticket->enc_part, &scratch))) {
free(scratch.data);
return retval;
}
#define clean_scratch() {memset(scratch.data, 0, scratch.length); \
free(scratch.data);}
/* now decode the decrypted stuff */
retval = decode_krb5_enc_tkt_part(&scratch, &dec_tkt_part);
if (!retval) {
ticket->enc_part2 = dec_tkt_part;
}
clean_scratch();
return retval;
}
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