rc4.c (41fe50f5deab9062cdf5915541105e47679ba571) rc4.c (018204af68182143703fed637168dbfb18230c48)
1
1/*
2 * rc4.c
3 *
4 * Copyright (c) 1996-2000 Whistle Communications, Inc.
5 * All rights reserved.
6 *
7 * Subject to the following obligations and disclaimer of warranty, use and
8 * redistribution of this software, in source or object code forms, with or

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27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
34 * OF SUCH DAMAGE.
2/*
3 * rc4.c
4 *
5 * Copyright (c) 1996-2000 Whistle Communications, Inc.
6 * All rights reserved.
7 *
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or

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28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * $FreeBSD$
35 */
36
38 */
39
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD$");
39
40#include <sys/param.h>
41#include <sys/kernel.h>
42#include <sys/module.h>
43#include <sys/types.h>
44#include <crypto/rc4/rc4.h>
45
46static __inline void
47swap_bytes(u_char *a, u_char *b)
48{
49 u_char temp;
50

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56/*
57 * Initialize an RC4 state buffer using the supplied key,
58 * which can have arbitrary length.
59 */
60void
61rc4_init(struct rc4_state *const state, const u_char *key, int keylen)
62{
63 u_char j;
40#include <sys/types.h>
41#include <crypto/rc4/rc4.h>
42
43static __inline void
44swap_bytes(u_char *a, u_char *b)
45{
46 u_char temp;
47

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53/*
54 * Initialize an RC4 state buffer using the supplied key,
55 * which can have arbitrary length.
56 */
57void
58rc4_init(struct rc4_state *const state, const u_char *key, int keylen)
59{
60 u_char j;
64 int i, k;
61 int i;
65
66 /* Initialize state with identity permutation */
67 for (i = 0; i < 256; i++)
68 state->perm[i] = (u_char)i;
69 state->index1 = 0;
70 state->index2 = 0;
71
72 /* Randomize the permutation using key data */
62
63 /* Initialize state with identity permutation */
64 for (i = 0; i < 256; i++)
65 state->perm[i] = (u_char)i;
66 state->index1 = 0;
67 state->index2 = 0;
68
69 /* Randomize the permutation using key data */
73 for (j = i = k = 0; i < 256; i++) {
74 j += state->perm[i] + key[k];
70 for (j = i = 0; i < 256; i++) {
71 j += state->perm[i] + key[i % keylen];
75 swap_bytes(&state->perm[i], &state->perm[j]);
72 swap_bytes(&state->perm[i], &state->perm[j]);
76 if (++k >= keylen)
77 k = 0;
78 }
79}
80
81/*
82 * Encrypt some data using the supplied RC4 state buffer.
83 * The input and output buffers may be the same buffer.
84 * Since RC4 is a stream cypher, this function is used
85 * for both encryption and decryption.

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102 &state->perm[state->index2]);
103
104 /* Encrypt/decrypt next byte */
105 j = state->perm[state->index1] + state->perm[state->index2];
106 outbuf[i] = inbuf[i] ^ state->perm[j];
107 }
108}
109
73 }
74}
75
76/*
77 * Encrypt some data using the supplied RC4 state buffer.
78 * The input and output buffers may be the same buffer.
79 * Since RC4 is a stream cypher, this function is used
80 * for both encryption and decryption.

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97 &state->perm[state->index2]);
98
99 /* Encrypt/decrypt next byte */
100 j = state->perm[state->index1] + state->perm[state->index2];
101 outbuf[i] = inbuf[i] ^ state->perm[j];
102 }
103}
104
110static int
111rc4_modevent(module_t mod, int type, void *unused)
112{
113 switch (type) {
114 case MOD_LOAD:
115 return 0;
116 case MOD_UNLOAD:
117 return 0;
118 }
119 return EINVAL;
120}
121
122static moduledata_t rc4_mod = {
123 "rc4",
124 rc4_modevent,
125 0
126};
127DECLARE_MODULE(rc4, rc4_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
128MODULE_VERSION(rc4, 1);