1 /*
2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6
7 /*
8 * Copyright (C) 1998 by the FundsXpress, INC.
9 *
10 * All rights reserved.
11 *
12 * Export of this software from the United States of America may require
13 * a specific license from the United States Government. It is the
14 * responsibility of any person or organization contemplating export to
15 * obtain such a license before exporting.
16 *
17 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
18 * distribute this software and its documentation for any purpose and
19 * without fee is hereby granted, provided that the above copyright
20 * notice appear in all copies and that both that copyright notice and
21 * this permission notice appear in supporting documentation, and that
22 * the name of FundsXpress. not be used in advertising or publicity pertaining
23 * to distribution of the software without specific, written prior
24 * permission. FundsXpress makes no representations about the suitability of
25 * this software for any purpose. It is provided "as is" without express
26 * or implied warranty.
27 *
28 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
29 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
30 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
31 */
32
33 #include "dk.h"
34
35 static const unsigned char kerberos[] = "kerberos";
36 #define kerberos_len (sizeof(kerberos)-1)
37
38 krb5_error_code
krb5int_dk_string_to_key(krb5_context context,const struct krb5_enc_provider * enc,const krb5_data * string,const krb5_data * salt,const krb5_data * parms,krb5_keyblock * key)39 krb5int_dk_string_to_key(
40 krb5_context context,
41 const struct krb5_enc_provider *enc,
42 const krb5_data *string, const krb5_data *salt,
43 const krb5_data *parms, krb5_keyblock *key)
44 {
45 krb5_error_code ret;
46 size_t keybytes, keylength, concatlen;
47 unsigned char *concat, *foldstring, *foldkeydata;
48 krb5_data indata;
49 krb5_keyblock foldkey;
50
51 /* key->length is checked by krb5_derive_key */
52
53 keybytes = enc->keybytes;
54 keylength = enc->keylength;
55
56 concatlen = string->length+(salt?salt->length:0);
57
58 if ((concat = (unsigned char *) malloc(concatlen)) == NULL)
59 return(ENOMEM);
60 if ((foldstring = (unsigned char *) malloc(keybytes)) == NULL) {
61 free(concat);
62 return(ENOMEM);
63 }
64 if ((foldkeydata = (unsigned char *) malloc(keylength)) == NULL) {
65 free(foldstring);
66 free(concat);
67 return(ENOMEM);
68 }
69
70 /* construct input string ( = string + salt), fold it, make_key it */
71
72 memcpy(concat, string->data, string->length);
73 if (salt)
74 memcpy(concat+string->length, salt->data, salt->length);
75
76 krb5_nfold(concatlen*8, concat, keybytes*8, foldstring);
77
78 indata.length = keybytes;
79 indata.data = (char *) foldstring;
80
81 /* Solaris Kerberos */
82 memset(&foldkey, 0, sizeof (krb5_keyblock));
83 foldkey.enctype = key->enctype;
84 foldkey.length = keylength;
85 foldkey.contents = foldkeydata;
86
87 /* Solaris Kerberos */
88 (*(enc->make_key))(context, &indata, &foldkey);
89
90 /* now derive the key from this one */
91
92 indata.length = kerberos_len;
93 indata.data = (char *) kerberos;
94 /* Solaris Kerberos */
95 if ((ret = krb5_derive_key(context, enc, &foldkey, key, &indata)))
96 (void) memset(key->contents, 0, key->length);
97
98 /* ret is set correctly by the prior call */
99
100 memset(concat, 0, concatlen);
101 memset(foldstring, 0, keybytes);
102 memset(foldkeydata, 0, keylength);
103
104 free(foldkeydata);
105 free(foldstring);
106 free(concat);
107
108 return(ret);
109 }
110