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4bd43f50 LR |
1 | /* |
2 | * Copyright (c) 2007-2008 Atheros Communications Inc. | |
3 | * | |
4 | * Permission to use, copy, modify, and/or distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
15 | */ | |
16 | /* */ | |
17 | /* Module Name : cwep.c */ | |
18 | /* */ | |
19 | /* Abstract */ | |
20 | /* This module contains Tx and Rx functions. */ | |
21 | /* */ | |
22 | /* NOTES */ | |
23 | /* None */ | |
24 | /* */ | |
25 | /************************************************************************/ | |
26 | #include "cprecomp.h" | |
27 | ||
28 | u32_t crc32_tab[] = | |
29 | { | |
30 | 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, | |
31 | 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, | |
32 | 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, | |
33 | 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, | |
34 | 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, | |
35 | 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, | |
36 | 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, | |
37 | 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, | |
38 | 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, | |
39 | 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, | |
40 | 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, | |
41 | 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, | |
42 | 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, | |
43 | 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, | |
44 | 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, | |
45 | 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, | |
46 | 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, | |
47 | 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, | |
48 | 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, | |
49 | 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, | |
50 | 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, | |
51 | 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, | |
52 | 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, | |
53 | 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, | |
54 | 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, | |
55 | 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, | |
56 | 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, | |
57 | 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, | |
58 | 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, | |
59 | 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, | |
60 | 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, | |
61 | 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, | |
62 | 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, | |
63 | 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, | |
64 | 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, | |
65 | 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, | |
66 | 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, | |
67 | 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, | |
68 | 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, | |
69 | 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, | |
70 | 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, | |
71 | 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, | |
72 | 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, | |
73 | 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, | |
74 | 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, | |
75 | 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, | |
76 | 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, | |
77 | 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, | |
78 | 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, | |
79 | 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, | |
80 | 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, | |
81 | 0x2d02ef8dL | |
82 | }; | |
83 | ||
84 | void zfWEPEncrypt(zdev_t *dev, zbuf_t *buf, u8_t *snap, u16_t snapLen, u16_t offset, u8_t keyLen, u8_t* WepKey, u8_t *iv) | |
85 | { | |
86 | u8_t S[256],S2[256]; | |
87 | u16_t ui; | |
88 | u16_t i; | |
89 | u16_t j; | |
90 | u8_t temp; | |
91 | u8_t K; | |
92 | u32_t ltemp; | |
93 | u16_t len; | |
94 | u32_t icv; | |
95 | u8_t key[32]; | |
96 | ||
97 | key[0] = iv[0]; | |
98 | key[1] = iv[1]; | |
99 | key[2] = iv[2]; | |
100 | ||
101 | /* Append Wep Key after IV */ | |
102 | zfMemoryCopy(&key[3], WepKey, keyLen); | |
103 | ||
104 | keyLen += 3; | |
105 | ||
106 | for(i = 0; i < 256; i++) | |
107 | { | |
108 | S[i] = (u8_t)i; | |
109 | S2[i] = key[i&(keyLen-1)]; | |
110 | } | |
111 | ||
112 | j = 0; | |
113 | for(i = 0; i < 256; i++) | |
114 | { | |
115 | j = (j + S[i] + S2[i]) ; | |
116 | j&=255 ; | |
117 | ||
118 | // Swap S[i] and S[j] | |
119 | temp = S[i]; | |
120 | S[i] = S[j]; | |
121 | S[j] = temp; | |
122 | } | |
123 | ||
124 | i = j = 0; | |
125 | icv = -1; | |
126 | ||
127 | /* For Snap Header */ | |
128 | for (ui = 0; ui < snapLen; ui++) | |
129 | { | |
130 | u8_t In; | |
131 | ||
132 | i++; | |
133 | i &= 255; | |
134 | j += S[i]; | |
135 | j &= 255; | |
136 | ||
137 | // Swap S[i] and S[j] | |
138 | temp = S[i]; | |
139 | S[i] = S[j]; | |
140 | S[j] = temp; | |
141 | // temp = (S[i] + temp) & 255; | |
142 | temp += S[i]; | |
143 | temp &=255; | |
144 | K = S[temp]; // Key used to Xor with input data | |
145 | ||
146 | In = snap[ui]; | |
147 | icv = (icv>>8) ^ crc32_tab[(icv^In)&0xff]; | |
148 | ||
149 | snap[ui] = In ^ K; | |
150 | //zmw_tx_buf_writeb(dev, buf, ui, In ^ K); | |
151 | } | |
152 | ||
153 | len = zfwBufGetSize(dev, buf); | |
154 | ||
155 | for (ui = offset; ui < len; ui++) | |
156 | { | |
157 | u8_t In; | |
158 | ||
159 | i++; | |
160 | i &= 255; | |
161 | j += S[i]; | |
162 | j &= 255; | |
163 | ||
164 | // Swap S[i] and S[j] | |
165 | temp = S[i]; | |
166 | S[i] = S[j]; | |
167 | S[j] = temp; | |
168 | // temp = (S[i] + temp) & 255; | |
169 | temp += S[i]; | |
170 | temp &=255; | |
171 | K = S[temp]; // Key used to Xor with input data | |
172 | ||
173 | In = zmw_tx_buf_readb(dev, buf, ui); | |
174 | icv = (icv>>8) ^ crc32_tab[(icv^In)&0xff]; | |
175 | ||
176 | zmw_tx_buf_writeb(dev, buf, ui, In ^ K); | |
177 | } //End of for (ui = 0; ui < Num_Bytes; ui++) | |
178 | ||
179 | icv = ~(icv); | |
180 | ltemp = (u32_t) icv; | |
181 | ||
182 | for (ui = 0; ui < 4; ui++) | |
183 | { | |
184 | i ++; | |
185 | i &= 255; | |
186 | j += S[i]; | |
187 | j &= 255; | |
188 | ||
189 | // Swap S[i] and S[j] | |
190 | temp = S[i]; | |
191 | S[i] = S[j]; | |
192 | S[j] = temp; | |
193 | temp += S[i]; | |
194 | temp &= 255; | |
195 | K = S[temp]; // Key used to Xor with input data | |
196 | ||
197 | //*Out++ = (u8_t)(ltemp ^ K)&0xff; | |
198 | zmw_tx_buf_writeb(dev, buf, len+ui, (u8_t)(ltemp ^ K)&0xff); | |
199 | ltemp >>= 8; | |
200 | } | |
201 | ||
202 | zfwBufSetSize(dev, buf, len+4); | |
203 | } | |
204 | ||
205 | u16_t zfWEPDecrypt(zdev_t *dev, zbuf_t *buf, u16_t offset, u8_t keyLen, u8_t* WepKey, u8_t *iv) | |
206 | { | |
207 | u8_t S[256]; | |
208 | u8_t S2[256]; | |
209 | u16_t ui; | |
210 | u16_t i; | |
211 | u16_t j; | |
212 | u32_t icv_tmp; | |
213 | u32_t *icv; | |
214 | u32_t rxbuf_icv; | |
215 | u8_t temp; | |
216 | u8_t K; | |
217 | u16_t len; | |
218 | u8_t key[32]; | |
219 | ||
220 | /* Retrieve IV */ | |
221 | key[0] = iv[0]; | |
222 | key[1] = iv[1]; | |
223 | key[2] = iv[2]; | |
224 | ||
225 | /* Append Wep Key after IV */ | |
226 | zfMemoryCopy(&key[3], WepKey, keyLen); | |
227 | ||
228 | keyLen += 3; | |
229 | ||
230 | for(i = 0; i < 256; i++) | |
231 | { | |
232 | S[i] = (u8_t)i; | |
233 | S2[i] = key[i&(keyLen-1)]; | |
234 | } | |
235 | ||
236 | j = 0; | |
237 | for(i = 0; i < 256; i++) | |
238 | { | |
239 | j = (j + S[i] + S2[i]); | |
240 | j&=255 ; | |
241 | ||
242 | // Swap S[i] and S[j] | |
243 | temp = S[i]; | |
244 | S[i] = S[j]; | |
245 | S[j] = temp; | |
246 | } | |
247 | ||
248 | i = j = 0; | |
249 | ||
250 | len = zfwBufGetSize(dev, buf); | |
251 | ||
252 | for (ui = offset; ui < len; ui++) | |
253 | { | |
254 | u8_t In; | |
255 | ||
256 | i++; | |
257 | i &= 255; | |
258 | j += S[i]; | |
259 | j &= 255; | |
260 | ||
261 | // Swap S[i] and S[j] | |
262 | temp = S[i]; | |
263 | S[i] = S[j]; | |
264 | S[j] = temp; | |
265 | // temp = (S[i] + temp) & 255; | |
266 | temp += S[i]; | |
267 | temp &=255; | |
268 | K = S[temp]; // Key used to Xor with input data | |
269 | ||
270 | In = zmw_rx_buf_readb(dev, buf, ui); | |
271 | ||
272 | zmw_rx_buf_writeb(dev, buf, ui, In ^ K); | |
273 | } //End of for (ui = 0; ui < Num_Bytes; ui++) | |
274 | ||
275 | icv = &icv_tmp; | |
276 | *icv = -1; | |
277 | ||
278 | for (ui = offset; ui < len - 4; ui++) | |
279 | { | |
280 | u8_t In; | |
281 | ||
282 | In = zmw_rx_buf_readb(dev, buf, ui); | |
283 | *icv = (*icv>>8) ^ crc32_tab[(*icv^In)&0xff]; | |
284 | } | |
285 | ||
286 | *icv = ~*icv; | |
287 | ||
288 | rxbuf_icv = (zmw_rx_buf_readb(dev, buf, len-4) | | |
289 | zmw_rx_buf_readb(dev, buf, len-3) << 8 | | |
290 | zmw_rx_buf_readb(dev, buf, len-2) << 16 | | |
291 | zmw_rx_buf_readb(dev, buf, len-1) << 24); | |
292 | ||
293 | if (*icv != rxbuf_icv) | |
294 | { | |
295 | return ZM_ICV_FAILURE; | |
296 | } | |
297 | ||
298 | return ZM_ICV_SUCCESS; | |
299 | } |