1/*
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 * krb5_kdc_rep_decrypt_proc()
28 */
29
30#include "k5-int.h"
31
32/*
33 * Decrypt the encrypted portion of the KDC_REP message, using the key
34 * passed.
35 *
36 */
37
38/*ARGSUSED*/
39krb5_error_code
40krb5_kdc_rep_decrypt_proc(krb5_context context, const krb5_keyblock *key, krb5_const_pointer decryptarg, krb5_kdc_rep *dec_rep)
41{
42    krb5_error_code retval;
43    krb5_data scratch;
44    krb5_enc_kdc_rep_part *local_encpart;
45    krb5_keyusage usage;
46
47    if (decryptarg) {
48	usage = *(const krb5_keyusage *) decryptarg;
49    } else {
50	usage = KRB5_KEYUSAGE_AS_REP_ENCPART;
51    }
52
53    /* set up scratch decrypt/decode area */
54
55    scratch.length = dec_rep->enc_part.ciphertext.length;
56    if (!(scratch.data = malloc(dec_rep->enc_part.ciphertext.length))) {
57	return(ENOMEM);
58    }
59
60    /*dec_rep->enc_part.enctype;*/
61
62    if ((retval = krb5_c_decrypt(context, key, usage, 0, &dec_rep->enc_part,
63				 &scratch))) {
64	free(scratch.data);
65	return(retval);
66    }
67
68#define clean_scratch() {memset(scratch.data, 0, scratch.length); \
69free(scratch.data);}
70
71    /* and do the decode */
72    retval = decode_krb5_enc_kdc_rep_part(&scratch, &local_encpart);
73    clean_scratch();
74    if (retval)
75	return retval;
76
77    dec_rep->enc_part2 = local_encpart;
78
79    return 0;
80}
81