This source file includes following definitions.
- wep_change_key
- wep_decrypt
- wep_encrypt
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 #include <linux/netdevice.h>
53 #include <linux/wireless.h>
54 #include <linux/random.h>
55 #include <linux/kernel.h>
56 #include "p80211hdr.h"
57 #include "p80211types.h"
58 #include "p80211msg.h"
59 #include "p80211conv.h"
60 #include "p80211netdev.h"
61
62 #define WEP_KEY(x) (((x) & 0xC0) >> 6)
63
64 static const u32 wep_crc32_table[256] = {
65 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
66 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
67 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
68 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
69 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
70 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
71 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
72 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
73 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
74 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
75 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
76 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
77 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
78 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
79 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
80 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
81 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
82 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
83 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
84 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
85 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
86 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
87 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
88 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
89 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
90 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
91 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
92 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
93 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
94 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
95 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
96 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
97 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
98 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
99 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
100 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
101 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
102 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
103 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
104 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
105 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
106 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
107 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
108 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
109 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
110 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
111 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
112 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
113 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
114 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
115 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
116 0x2d02ef8dL
117 };
118
119
120
121 int wep_change_key(struct wlandevice *wlandev, int keynum, u8 *key, int keylen)
122 {
123 if (keylen < 0)
124 return -1;
125 if (keylen >= MAX_KEYLEN)
126 return -1;
127 if (!key)
128 return -1;
129 if (keynum < 0)
130 return -1;
131 if (keynum >= NUM_WEPKEYS)
132 return -1;
133
134 wlandev->wep_keylens[keynum] = keylen;
135 memcpy(wlandev->wep_keys[keynum], key, keylen);
136
137 return 0;
138 }
139
140
141
142
143
144 int wep_decrypt(struct wlandevice *wlandev, u8 *buf, u32 len, int key_override,
145 u8 *iv, u8 *icv)
146 {
147 u32 i, j, k, crc, keylen;
148 u8 s[256], key[64], c_crc[4];
149 u8 keyidx;
150
151
152 if (len <= 0)
153 return -1;
154
155
156 key[0] = iv[0];
157 key[1] = iv[1];
158 key[2] = iv[2];
159 keyidx = WEP_KEY(iv[3]);
160
161 if (key_override >= 0)
162 keyidx = key_override;
163
164 if (keyidx >= NUM_WEPKEYS)
165 return -2;
166
167 keylen = wlandev->wep_keylens[keyidx];
168
169 if (keylen == 0)
170 return -3;
171
172
173 memcpy(key + 3, wlandev->wep_keys[keyidx], keylen);
174
175 keylen += 3;
176
177
178 for (i = 0; i < 256; i++)
179 s[i] = i;
180 j = 0;
181 for (i = 0; i < 256; i++) {
182 j = (j + s[i] + key[i % keylen]) & 0xff;
183 swap(i, j);
184 }
185
186
187 crc = ~0;
188 i = 0;
189 j = 0;
190 for (k = 0; k < len; k++) {
191 i = (i + 1) & 0xff;
192 j = (j + s[i]) & 0xff;
193 swap(i, j);
194 buf[k] ^= s[(s[i] + s[j]) & 0xff];
195 crc = wep_crc32_table[(crc ^ buf[k]) & 0xff] ^ (crc >> 8);
196 }
197 crc = ~crc;
198
199
200 c_crc[0] = crc;
201 c_crc[1] = crc >> 8;
202 c_crc[2] = crc >> 16;
203 c_crc[3] = crc >> 24;
204
205 for (k = 0; k < 4; k++) {
206 i = (i + 1) & 0xff;
207 j = (j + s[i]) & 0xff;
208 swap(i, j);
209 if ((c_crc[k] ^ s[(s[i] + s[j]) & 0xff]) != icv[k])
210 return -(4 | (k << 4));
211 }
212
213 return 0;
214 }
215
216
217 int wep_encrypt(struct wlandevice *wlandev, u8 *buf,
218 u8 *dst, u32 len, int keynum, u8 *iv, u8 *icv)
219 {
220 u32 i, j, k, crc, keylen;
221 u8 s[256], key[64];
222
223
224 if (len <= 0)
225 return -1;
226
227
228 if (keynum >= NUM_WEPKEYS)
229 return -2;
230 keylen = wlandev->wep_keylens[keynum];
231 if (keylen <= 0)
232 return -3;
233
234
235 get_random_bytes(iv, 3);
236 while ((iv[1] == 0xff) && (iv[0] >= 3) && (iv[0] < keylen))
237 get_random_bytes(iv, 3);
238
239 iv[3] = (keynum & 0x03) << 6;
240
241 key[0] = iv[0];
242 key[1] = iv[1];
243 key[2] = iv[2];
244
245
246 memcpy(key + 3, wlandev->wep_keys[keynum], keylen);
247
248 keylen += 3;
249
250
251 for (i = 0; i < 256; i++)
252 s[i] = i;
253 j = 0;
254 for (i = 0; i < 256; i++) {
255 j = (j + s[i] + key[i % keylen]) & 0xff;
256 swap(i, j);
257 }
258
259
260 crc = ~0;
261 i = 0;
262 j = 0;
263 for (k = 0; k < len; k++) {
264 crc = wep_crc32_table[(crc ^ buf[k]) & 0xff] ^ (crc >> 8);
265 i = (i + 1) & 0xff;
266 j = (j + s[i]) & 0xff;
267 swap(i, j);
268 dst[k] = buf[k] ^ s[(s[i] + s[j]) & 0xff];
269 }
270 crc = ~crc;
271
272
273 icv[0] = crc;
274 icv[1] = crc >> 8;
275 icv[2] = crc >> 16;
276 icv[3] = crc >> 24;
277
278 for (k = 0; k < 4; k++) {
279 i = (i + 1) & 0xff;
280 j = (j + s[i]) & 0xff;
281 swap(i, j);
282 icv[k] ^= s[(s[i] + s[j]) & 0xff];
283 }
284
285 return 0;
286 }