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
36 static krb5_error_code
k5_des3_docrypt(krb5_context context,krb5_const krb5_keyblock * key,krb5_const krb5_data * ivec,krb5_const krb5_data * input,krb5_data * output,int encrypt)37 k5_des3_docrypt(krb5_context context,
38 krb5_const krb5_keyblock *key, krb5_const krb5_data *ivec,
39 krb5_const krb5_data *input, krb5_data *output, int encrypt)
40 {
41 /* LINTED */
42 krb5_error_code ret;
43
44 KRB5_LOG0(KRB5_INFO, "k5_des3_docrypt() start");
45
46 /* key->enctype was checked by the caller */
47
48 if (key->length != 24)
49 return(KRB5_BAD_KEYSIZE);
50 if ((input->length%8) != 0)
51 return(KRB5_BAD_MSIZE);
52 if (ivec && (ivec->length != 8))
53 return(KRB5_BAD_MSIZE);
54 if (input->length != output->length)
55 return(KRB5_BAD_MSIZE);
56
57 ret = mit_des3_cbc_encrypt(context, (krb5_pointer) input->data,
58 (krb5_pointer) output->data, input->length,
59 (krb5_keyblock *)key,
60 ivec?(unsigned char *)ivec->data:(unsigned char *)mit_des_zeroblock,
61 encrypt);
62
63 KRB5_LOG0(KRB5_INFO, "k5_des3_docrypt() end\n");
64 return(ret);
65 }
66
67 static krb5_error_code
k5_des3_encrypt(krb5_context context,krb5_const krb5_keyblock * key,krb5_const krb5_data * ivec,krb5_const krb5_data * input,krb5_data * output)68 k5_des3_encrypt(krb5_context context,
69 krb5_const krb5_keyblock *key, krb5_const krb5_data *ivec,
70 krb5_const krb5_data *input, krb5_data *output)
71 {
72 return(k5_des3_docrypt(context, key, ivec, input, output, 1));
73 }
74
75 static krb5_error_code
k5_des3_decrypt(krb5_context context,krb5_const krb5_keyblock * key,krb5_const krb5_data * ivec,krb5_const krb5_data * input,krb5_data * output)76 k5_des3_decrypt(krb5_context context,
77 krb5_const krb5_keyblock *key, krb5_const krb5_data *ivec,
78 krb5_const krb5_data *input, krb5_data *output)
79 {
80 return(k5_des3_docrypt(context, key, ivec, input, output, 0));
81 }
82
83 static krb5_error_code
k5_des3_make_key(krb5_context context,krb5_const krb5_data * randombits,krb5_keyblock * key)84 k5_des3_make_key(krb5_context context, krb5_const krb5_data *randombits,
85 krb5_keyblock *key)
86 {
87 int i;
88 krb5_error_code ret = 0;
89
90 KRB5_LOG0(KRB5_INFO, "k5_des3_make_key() start\n");
91
92 if (key->length != 24)
93 return(KRB5_BAD_KEYSIZE);
94 if (randombits->length != 21)
95 return(KRB5_CRYPTO_INTERNAL);
96
97 key->magic = KV5M_KEYBLOCK;
98 key->length = 24;
99 key->dk_list = NULL;
100
101 /* take the seven bytes, move them around into the top 7 bits of the
102 8 key bytes, then compute the parity bits. Do this three times. */
103
104 for (i=0; i<3; i++) {
105 (void) memcpy(key->contents+i*8, randombits->data+i*7, 7);
106 key->contents[i*8+7] = (((key->contents[i*8]&1)<<1) |
107 ((key->contents[i*8+1]&1)<<2) |
108 ((key->contents[i*8+2]&1)<<3) |
109 ((key->contents[i*8+3]&1)<<4) |
110 ((key->contents[i*8+4]&1)<<5) |
111 ((key->contents[i*8+5]&1)<<6) |
112 ((key->contents[i*8+6]&1)<<7));
113
114 mit_des_fixup_key_parity(key->contents+i*8);
115 }
116 #ifdef _KERNEL
117 key->kef_key.ck_data = NULL;
118 key->key_tmpl = NULL;
119 ret = init_key_kef(context->kef_cipher_mt, key);
120 #else
121 key->hKey = CK_INVALID_HANDLE;
122 ret = init_key_uef(krb_ctx_hSession(context), key);
123 #endif /* _KERNEL */
124 KRB5_LOG0(KRB5_INFO, "k5_des3_make_key() end\n");
125 return(ret);
126 }
127
128 const struct krb5_enc_provider krb5int_enc_des3 = {
129 8,
130 21, 24,
131 k5_des3_encrypt,
132 k5_des3_decrypt,
133 k5_des3_make_key,
134 krb5int_des_init_state,
135 krb5int_default_free_state
136 };
137