xref: /illumos-gate/usr/src/lib/krb5/kdb/encrypt_key.c (revision 159d09a2)
1 /*
2  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 
7 /*
8  * lib/kdb/encrypt_key.c
9  *
10  * Copyright 1990,1991 by the Massachusetts Institute of Technology.
11  * All Rights Reserved.
12  *
13  * Export of this software from the United States of America may
14  *   require a specific license from the United States Government.
15  *   It is the responsibility of any person or organization contemplating
16  *   export to obtain such a license before exporting.
17  *
18  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
19  * distribute this software and its documentation for any purpose and
20  * without fee is hereby granted, provided that the above copyright
21  * notice appear in all copies and that both that copyright notice and
22  * this permission notice appear in supporting documentation, and that
23  * the name of M.I.T. not be used in advertising or publicity pertaining
24  * to distribution of the software without specific, written prior
25  * permission.  Furthermore if you modify this software you must label
26  * your software as modified software and not distribute it in such a
27  * fashion that it might be confused with the original M.I.T. software.
28  * M.I.T. makes no representations about the suitability of
29  * this software for any purpose.  It is provided "as is" without express
30  * or implied warranty.
31  *
32  *
33  * krb5_kdb_encrypt_key(), krb5_kdb_decrypt_key functions
34  */
35 
36 /*
37  * Copyright (C) 1998 by the FundsXpress, INC.
38  *
39  * All rights reserved.
40  *
41  * Export of this software from the United States of America may require
42  * a specific license from the United States Government.  It is the
43  * responsibility of any person or organization contemplating export to
44  * obtain such a license before exporting.
45  *
46  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
47  * distribute this software and its documentation for any purpose and
48  * without fee is hereby granted, provided that the above copyright
49  * notice appear in all copies and that both that copyright notice and
50  * this permission notice appear in supporting documentation, and that
51  * the name of FundsXpress. not be used in advertising or publicity pertaining
52  * to distribution of the software without specific, written prior
53  * permission.  FundsXpress makes no representations about the suitability of
54  * this software for any purpose.  It is provided "as is" without express
55  * or implied warranty.
56  *
57  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
58  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
59  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
60  */
61 
62 #include "k5-int.h"
63 #include <krb5/kdb.h>
64 
65 /*
66  * Encrypt a key for storage in the database.  "eblock" is used
67  * to encrypt the key in "in" into "out"; the storage pointed to by "out"
68  * is allocated before use.
69  */
70 
71 krb5_error_code
krb5_dbekd_encrypt_key_data(krb5_context context,const krb5_keyblock * mkey,const krb5_keyblock * dbkey,const krb5_keysalt * keysalt,int keyver,krb5_key_data * key_data)72 krb5_dbekd_encrypt_key_data( krb5_context 		  context,
73 			     const krb5_keyblock	* mkey,
74 			     const krb5_keyblock 	* dbkey,
75 			     const krb5_keysalt		* keysalt,
76 			     int			  keyver,
77 			     krb5_key_data	        * key_data)
78 {
79     krb5_error_code 		  retval;
80     krb5_octet			* ptr;
81     size_t			  len;
82     int				  i;
83     krb5_data			  plain;
84     krb5_enc_data		  cipher;
85 
86     for (i = 0; i < key_data->key_data_ver; i++)
87 	if (key_data->key_data_contents[i])
88 	    krb5_xfree(key_data->key_data_contents[i]);
89 
90     key_data->key_data_ver = 1;
91     key_data->key_data_kvno = keyver;
92 
93     /*
94      * The First element of the type/length/contents
95      * fields is the key type/length/contents
96      */
97     if ((retval = krb5_c_encrypt_length(context, mkey->enctype, dbkey->length,
98 					&len)))
99 	return(retval);
100 
101     if ((ptr = (krb5_octet *) malloc(2 + len)) == NULL)
102 	return(ENOMEM);
103 
104     (void) memset(ptr, 0, 2 + len);
105 
106     key_data->key_data_type[0] = dbkey->enctype;
107     key_data->key_data_length[0] = 2 + len;
108     key_data->key_data_contents[0] = ptr;
109 
110     krb5_kdb_encode_int16(dbkey->length, ptr);
111     ptr += 2;
112 
113     plain.length = dbkey->length;
114     plain.data = (char *)dbkey->contents;  /* SUNWresync121 XXX */
115 
116     cipher.ciphertext.length = len;
117     cipher.ciphertext.data = (char *)ptr; /* SUNWresync121 XXX */
118 
119     if ((retval = krb5_c_encrypt(context, mkey, /* XXX */ 0, 0,
120 				 &plain, &cipher))) {
121 	krb5_xfree(key_data->key_data_contents[0]);
122 	return retval;
123     }
124 
125     /* After key comes the salt in necessary */
126     if (keysalt) {
127 	if (keysalt->type > 0) {
128 	    key_data->key_data_ver++;
129 	    key_data->key_data_type[1] = keysalt->type;
130 	    if ((key_data->key_data_length[1] = keysalt->data.length) != 0) {
131 		key_data->key_data_contents[1] =
132 		    (krb5_octet *)malloc(keysalt->data.length);
133 		if (key_data->key_data_contents[1] == NULL) {
134 		    krb5_xfree(key_data->key_data_contents[0]);
135 		    return ENOMEM;
136 		}
137 		memcpy(key_data->key_data_contents[1], keysalt->data.data,
138 		       (size_t) keysalt->data.length);
139 	    }
140 	}
141     }
142 
143     return retval;
144 }
145