1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/*
* null_cipher.c
*
* A null cipher implementation. This cipher leaves the plaintext
* unchanged.
*
* David A. McGrew
* Cisco Systems, Inc.
*/
/*
*
* Copyright (c) 2001-2006, Cisco Systems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* Neither the name of the Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "datatypes.h"
#include "null_cipher.h"
#include "alloc.h"
/* the null_cipher uses the cipher debug module */
extern debug_module_t mod_cipher;
err_status_t
null_cipher_alloc(cipher_t **c, int key_len) {
extern cipher_type_t null_cipher;
uint8_t *pointer;
debug_print(mod_cipher,
"allocating cipher with key length %d", key_len);
/* allocate memory a cipher of type null_cipher */
pointer = (uint8_t*)crypto_alloc(sizeof(null_cipher_ctx_t) + sizeof(cipher_t));
if (pointer == NULL)
return err_status_alloc_fail;
/* set pointers */
*c = (cipher_t *)pointer;
(*c)->type = &null_cipher;
(*c)->state = pointer + sizeof(cipher_t);
/* set key size */
(*c)->key_len = key_len;
/* increment ref_count */
null_cipher.ref_count++;
return err_status_ok;
}
err_status_t
null_cipher_dealloc(cipher_t *c) {
extern cipher_type_t null_cipher;
/* zeroize entire state*/
octet_string_set_to_zero((uint8_t *)c,
sizeof(null_cipher_ctx_t) + sizeof(cipher_t));
/* free memory of type null_cipher */
crypto_free(c);
/* decrement reference count */
null_cipher.ref_count--;
return err_status_ok;
}
err_status_t
null_cipher_init(null_cipher_ctx_t *ctx, const uint8_t *key, int key_len) {
debug_print(mod_cipher, "initializing null cipher", NULL);
return err_status_ok;
}
err_status_t
null_cipher_set_iv(null_cipher_ctx_t *c, void *iv) {
return err_status_ok;
}
err_status_t
null_cipher_encrypt(null_cipher_ctx_t *c,
unsigned char *buf, unsigned int *bytes_to_encr) {
return err_status_ok;
}
char
null_cipher_description[] = "null cipher";
cipher_test_case_t
null_cipher_test_0 = {
0, /* octets in key */
NULL, /* key */
0, /* packet index */
0, /* octets in plaintext */
NULL, /* plaintext */
0, /* octets in plaintext */
NULL, /* ciphertext */
NULL /* pointer to next testcase */
};
/*
* note: the decrypt function is idential to the encrypt function
*/
cipher_type_t null_cipher = {
(cipher_alloc_func_t) null_cipher_alloc,
(cipher_dealloc_func_t) null_cipher_dealloc,
(cipher_init_func_t) null_cipher_init,
(cipher_encrypt_func_t) null_cipher_encrypt,
(cipher_decrypt_func_t) null_cipher_encrypt,
(cipher_set_iv_func_t) null_cipher_set_iv,
(char *) null_cipher_description,
(int) 0,
(cipher_test_case_t *) &null_cipher_test_0,
(debug_module_t *) NULL,
(cipher_type_id_t) NULL_CIPHER
};
|
