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 "k5-int.h"
34 #include "des_int.h"
35 #include "enc_provider.h"
36
37 static krb5_error_code
k5_des_docrypt(krb5_context context,krb5_const krb5_keyblock * key,krb5_const krb5_data * ivec,krb5_const krb5_data * input,krb5_data * output,int encrypt)38 k5_des_docrypt(krb5_context context, krb5_const krb5_keyblock *key,
39 krb5_const krb5_data *ivec, krb5_const krb5_data *input,
40 krb5_data *output, int encrypt)
41 {
42 krb5_error_code ret;
43
44 KRB5_LOG(KRB5_INFO, "k5_des_docrypt() start encrypt=%d\n", encrypt);
45 /* key->enctype was checked by the caller */
46
47 if (key->length != 8)
48 return(KRB5_BAD_KEYSIZE);
49 if ((input->length%8) != 0)
50 return(KRB5_BAD_MSIZE);
51 if (ivec && (ivec->length != 8))
52 return(KRB5_BAD_MSIZE);
53 if (input->length != output->length)
54 return(KRB5_BAD_MSIZE);
55
56 ret = mit_des_cbc_encrypt(context, (krb5_pointer) input->data,
57 (krb5_pointer) output->data, input->length,
58 (krb5_keyblock *)key,
59 ivec?(unsigned char *)ivec->data:
60 (unsigned char *)mit_des_zeroblock, encrypt);
61
62 KRB5_LOG0(KRB5_INFO, "k5_des_docrypt() end\n");
63 return(ret);
64 }
65
66 static krb5_error_code
k5_des_encrypt(krb5_context context,krb5_const krb5_keyblock * key,krb5_const krb5_data * ivec,krb5_const krb5_data * input,krb5_data * output)67 k5_des_encrypt(krb5_context context, krb5_const krb5_keyblock *key,
68 krb5_const krb5_data *ivec, krb5_const krb5_data *input,
69 krb5_data *output)
70 {
71 return(k5_des_docrypt(context, key, ivec, input, output, 1));
72 }
73
74 static krb5_error_code
k5_des_decrypt(krb5_context context,krb5_const krb5_keyblock * key,krb5_const krb5_data * ivec,krb5_const krb5_data * input,krb5_data * output)75 k5_des_decrypt(krb5_context context, krb5_const krb5_keyblock *key,
76 krb5_const krb5_data *ivec, krb5_const krb5_data *input,
77 krb5_data *output)
78 {
79 return(k5_des_docrypt(context, key, ivec, input, output, 0));
80 }
81
82 static krb5_error_code
k5_des_make_key(krb5_context context,krb5_const krb5_data * randombits,krb5_keyblock * key)83 k5_des_make_key(krb5_context context, krb5_const krb5_data *randombits,
84 krb5_keyblock *key)
85 {
86 krb5_error_code ret = 0;
87 if (key->length != 8)
88 return(KRB5_BAD_KEYSIZE);
89 if (randombits->length != 7)
90 return(KRB5_CRYPTO_INTERNAL);
91
92 key->magic = KV5M_KEYBLOCK;
93 key->length = 8;
94 key->dk_list = NULL;
95
96 /* take the seven bytes, move them around into the top 7 bits of the
97 8 key bytes, then compute the parity bits */
98
99 (void) memcpy(key->contents, randombits->data, randombits->length);
100 key->contents[7] = (((key->contents[0]&1)<<1) | ((key->contents[1]&1)<<2) |
101 ((key->contents[2]&1)<<3) | ((key->contents[3]&1)<<4) |
102 ((key->contents[4]&1)<<5) | ((key->contents[5]&1)<<6) |
103 ((key->contents[6]&1)<<7));
104
105 mit_des_fixup_key_parity(key->contents);
106
107 #ifdef _KERNEL
108 key->kef_key.ck_data = NULL;
109 key->key_tmpl = NULL;
110 ret = init_key_kef(context->kef_cipher_mt, key);
111 #else
112 key->hKey = CK_INVALID_HANDLE;
113 ret = init_key_uef(krb_ctx_hSession(context), key);
114 #endif /* _KERNEL */
115
116 return (ret);
117 }
118
119 const struct krb5_enc_provider krb5int_enc_des = {
120 8,
121 7, 8,
122 k5_des_encrypt,
123 k5_des_decrypt,
124 k5_des_make_key,
125 krb5int_des_init_state,
126 krb5int_default_free_state
127 };
128