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
37static krb5_error_code
38k5_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
66static krb5_error_code
67k5_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
74static krb5_error_code
75k5_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
82static krb5_error_code
83k5_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
119const 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