1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /*
3 * Copyright (C) 1998 by the FundsXpress, INC.
4 *
5 * All rights reserved.
6 *
7 * Export of this software from the United States of America may require
8 * a specific license from the United States Government. It is the
9 * responsibility of any person or organization contemplating export to
10 * 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 FundsXpress. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. FundsXpress makes no representations about the suitability of
20 * this software for any purpose. It is provided "as is" without express
21 * or implied warranty.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
25 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
26 */
27
28 #include "crypto_int.h"
29
30 /* A 0 checksum type means use the mandatory checksum. */
31
32 krb5_error_code KRB5_CALLCONV
krb5_k_make_checksum(krb5_context context,krb5_cksumtype cksumtype,krb5_key key,krb5_keyusage usage,const krb5_data * input,krb5_checksum * cksum)33 krb5_k_make_checksum(krb5_context context, krb5_cksumtype cksumtype,
34 krb5_key key, krb5_keyusage usage,
35 const krb5_data *input, krb5_checksum *cksum)
36 {
37 const struct krb5_cksumtypes *ctp;
38 krb5_crypto_iov iov;
39 krb5_data cksum_data;
40 krb5_octet *trunc;
41 krb5_error_code ret;
42
43 if (cksumtype == 0 && key != NULL) {
44 ret = krb5int_c_mandatory_cksumtype(context, key->keyblock.enctype,
45 &cksumtype);
46 if (ret != 0)
47 return ret;
48 }
49 ctp = find_cksumtype(cksumtype);
50 if (ctp == NULL)
51 return KRB5_BAD_ENCTYPE;
52
53 ret = verify_key(ctp, key);
54 if (ret != 0)
55 return ret;
56
57 ret = alloc_data(&cksum_data, ctp->compute_size);
58 if (ret != 0)
59 return ret;
60
61 iov.flags = KRB5_CRYPTO_TYPE_DATA;
62 iov.data = *input;
63 ret = ctp->checksum(ctp, key, usage, &iov, 1, &cksum_data);
64 if (ret != 0)
65 goto cleanup;
66
67 cksum->magic = KV5M_CHECKSUM;
68 cksum->checksum_type = cksumtype;
69 cksum->length = ctp->output_size;
70 cksum->contents = (krb5_octet *) cksum_data.data;
71 cksum_data.data = NULL;
72 if (ctp->output_size < ctp->compute_size) {
73 trunc = realloc(cksum->contents, ctp->output_size);
74 if (trunc != NULL)
75 cksum->contents = trunc;
76 }
77
78 cleanup:
79 zapfree(cksum_data.data, ctp->compute_size);
80 return ret;
81 }
82
83 krb5_error_code KRB5_CALLCONV
krb5_c_make_checksum(krb5_context context,krb5_cksumtype cksumtype,const krb5_keyblock * keyblock,krb5_keyusage usage,const krb5_data * input,krb5_checksum * cksum)84 krb5_c_make_checksum(krb5_context context, krb5_cksumtype cksumtype,
85 const krb5_keyblock *keyblock, krb5_keyusage usage,
86 const krb5_data *input, krb5_checksum *cksum)
87 {
88 krb5_key key = NULL;
89 krb5_error_code ret;
90
91 if (keyblock != NULL) {
92 ret = krb5_k_create_key(context, keyblock, &key);
93 if (ret != 0)
94 return ret;
95 }
96 ret = krb5_k_make_checksum(context, cksumtype, key, usage, input, cksum);
97 krb5_k_free_key(context, key);
98 return ret;
99 }
100