1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/krb5/krb/kdc_rep_dc.c */
3 /*
4 * Copyright 1990 by the Massachusetts Institute of Technology.
5 * All Rights Reserved.
6 *
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
25 */
26
27 #include "k5-int.h"
28
29 /*
30 * Decrypt the encrypted portion of the KDC_REP message, using the key
31 * passed.
32 *
33 */
34
35 /*ARGSUSED*/
36 krb5_error_code
krb5_kdc_rep_decrypt_proc(krb5_context context,const krb5_keyblock * key,krb5_const_pointer decryptarg,krb5_kdc_rep * dec_rep)37 krb5_kdc_rep_decrypt_proc(krb5_context context, const krb5_keyblock *key, krb5_const_pointer decryptarg, krb5_kdc_rep *dec_rep)
38 {
39 krb5_error_code retval;
40 krb5_data scratch;
41 krb5_enc_kdc_rep_part *local_encpart;
42 krb5_keyusage usage;
43
44 if (decryptarg) {
45 usage = *(const krb5_keyusage *) decryptarg;
46 } else {
47 usage = KRB5_KEYUSAGE_AS_REP_ENCPART;
48 }
49
50 /* set up scratch decrypt/decode area */
51
52 scratch.length = dec_rep->enc_part.ciphertext.length;
53 if (!(scratch.data = malloc(dec_rep->enc_part.ciphertext.length))) {
54 return(ENOMEM);
55 }
56
57 /*dec_rep->enc_part.enctype;*/
58
59 if ((retval = krb5_c_decrypt(context, key, usage, 0, &dec_rep->enc_part,
60 &scratch))) {
61 free(scratch.data);
62 return(retval);
63 }
64
65 #define clean_scratch() {memset(scratch.data, 0, scratch.length); \
66 free(scratch.data);}
67
68 /* and do the decode */
69 retval = decode_krb5_enc_kdc_rep_part(&scratch, &local_encpart);
70 clean_scratch();
71 if (retval)
72 return retval;
73
74 dec_rep->enc_part2 = local_encpart;
75
76 return 0;
77 }
78