1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/crypto/krb/make_checksum_iov.c */
3 /*
4 * Copyright 2008 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 "crypto_int.h"
28
29 krb5_error_code KRB5_CALLCONV
krb5_k_make_checksum_iov(krb5_context context,krb5_cksumtype cksumtype,krb5_key key,krb5_keyusage usage,krb5_crypto_iov * data,size_t num_data)30 krb5_k_make_checksum_iov(krb5_context context,
31 krb5_cksumtype cksumtype,
32 krb5_key key,
33 krb5_keyusage usage,
34 krb5_crypto_iov *data,
35 size_t num_data)
36 {
37 krb5_error_code ret;
38 krb5_data cksum_data;
39 krb5_crypto_iov *checksum;
40 const struct krb5_cksumtypes *ctp;
41
42 if (cksumtype == 0 && key != NULL) {
43 ret = krb5int_c_mandatory_cksumtype(context, key->keyblock.enctype,
44 &cksumtype);
45 if (ret != 0)
46 return ret;
47 }
48 ctp = find_cksumtype(cksumtype);
49 if (ctp == NULL)
50 return KRB5_BAD_ENCTYPE;
51
52 ret = verify_key(ctp, key);
53 if (ret != 0)
54 return ret;
55
56 checksum = krb5int_c_locate_iov(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
57 if (checksum == NULL || checksum->data.length < ctp->output_size)
58 return(KRB5_BAD_MSIZE);
59
60 ret = alloc_data(&cksum_data, ctp->compute_size);
61 if (ret != 0)
62 return ret;
63
64 ret = ctp->checksum(ctp, key, usage, data, num_data, &cksum_data);
65 if (ret != 0)
66 goto cleanup;
67
68 memcpy(checksum->data.data, cksum_data.data, ctp->output_size);
69 checksum->data.length = ctp->output_size;
70
71 cleanup:
72 zapfree(cksum_data.data, ctp->compute_size);
73 return ret;
74 }
75
76 krb5_error_code KRB5_CALLCONV
krb5_c_make_checksum_iov(krb5_context context,krb5_cksumtype cksumtype,const krb5_keyblock * keyblock,krb5_keyusage usage,krb5_crypto_iov * data,size_t num_data)77 krb5_c_make_checksum_iov(krb5_context context,
78 krb5_cksumtype cksumtype,
79 const krb5_keyblock *keyblock,
80 krb5_keyusage usage,
81 krb5_crypto_iov *data,
82 size_t num_data)
83 {
84 krb5_key key = NULL;
85 krb5_error_code ret;
86
87 if (keyblock != NULL) {
88 ret = krb5_k_create_key(context, keyblock, &key);
89 if (ret != 0)
90 return ret;
91 }
92 ret = krb5_k_make_checksum_iov(context, cksumtype, key, usage,
93 data, num_data);
94 krb5_k_free_key(context, key);
95 return ret;
96 }
97