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1 | /* |
2 | * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along | |
16 | * with this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | * | |
19 | * | |
20 | * File: aes_ccmp.c | |
21 | * | |
22 | * Purpose: AES_CCMP decryption | |
23 | * | |
24 | * Author: Warren Hsu | |
25 | * | |
26 | * Date: Feb 15, 2005 | |
27 | * | |
28 | * Functions: | |
29 | * AESbGenCCMP - Parsing RX-packet | |
30 | * | |
31 | * | |
32 | * Revision History: | |
33 | * | |
34 | */ | |
35 | ||
36 | #if !defined(__UMEM_H__) | |
37 | #include "umem.h" | |
38 | #endif | |
39 | #if !defined(__DEVICE_H__) | |
40 | #include "device.h" | |
41 | #endif | |
42 | #if !defined(__80211HDR_H__) | |
43 | #include "80211hdr.h" | |
44 | #endif | |
45 | ||
46 | ||
47 | /*--------------------- Static Definitions -------------------------*/ | |
48 | ||
49 | /*--------------------- Static Classes ----------------------------*/ | |
50 | ||
51 | /*--------------------- Static Variables --------------------------*/ | |
52 | ||
53 | /* | |
54 | * SBOX Table | |
55 | */ | |
56 | ||
57 | BYTE sbox_table[256] = | |
58 | { | |
59 | 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, | |
60 | 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, | |
61 | 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, | |
62 | 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, | |
63 | 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, | |
64 | 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, | |
65 | 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, | |
66 | 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, | |
67 | 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, | |
68 | 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, | |
69 | 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, | |
70 | 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, | |
71 | 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, | |
72 | 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, | |
73 | 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, | |
74 | 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 | |
75 | }; | |
76 | ||
77 | BYTE dot2_table[256] = { | |
78 | 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, | |
79 | 0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, | |
80 | 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, | |
81 | 0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, | |
82 | 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, | |
83 | 0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, | |
84 | 0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde, | |
85 | 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, | |
86 | 0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05, | |
87 | 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25, | |
88 | 0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, | |
89 | 0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65, | |
90 | 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, | |
91 | 0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5, | |
92 | 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5, | |
93 | 0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5 | |
94 | }; | |
95 | ||
96 | BYTE dot3_table[256] = { | |
97 | 0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, 0x12, 0x11, | |
98 | 0x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21, | |
99 | 0x60, 0x63, 0x66, 0x65, 0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71, | |
100 | 0x50, 0x53, 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41, | |
101 | 0xc0, 0xc3, 0xc6, 0xc5, 0xcc, 0xcf, 0xca, 0xc9, 0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1, | |
102 | 0xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1, | |
103 | 0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, 0xb8, 0xbb, 0xbe, 0xbd, 0xb4, 0xb7, 0xb2, 0xb1, | |
104 | 0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81, | |
105 | 0x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, 0x8f, 0x8c, 0x89, 0x8a, | |
106 | 0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, 0xb9, 0xba, | |
107 | 0xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea, | |
108 | 0xcb, 0xc8, 0xcd, 0xce, 0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda, | |
109 | 0x5b, 0x58, 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a, | |
110 | 0x6b, 0x68, 0x6d, 0x6e, 0x67, 0x64, 0x61, 0x62, 0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a, | |
111 | 0x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a, | |
112 | 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, 0x13, 0x10, 0x15, 0x16, 0x1f, 0x1c, 0x19, 0x1a | |
113 | }; | |
114 | ||
115 | /*--------------------- Static Functions --------------------------*/ | |
116 | ||
117 | /*--------------------- Export Variables --------------------------*/ | |
118 | ||
119 | /*--------------------- Export Functions --------------------------*/ | |
120 | ||
121 | void xor_128(BYTE *a, BYTE *b, BYTE *out) | |
122 | { | |
123 | PDWORD dwPtrA = (PDWORD) a; | |
124 | PDWORD dwPtrB = (PDWORD) b; | |
125 | PDWORD dwPtrOut =(PDWORD) out; | |
126 | ||
127 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); | |
128 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); | |
129 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); | |
130 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); | |
131 | } | |
132 | ||
133 | ||
134 | void xor_32(BYTE *a, BYTE *b, BYTE *out) | |
135 | { | |
136 | PDWORD dwPtrA = (PDWORD) a; | |
137 | PDWORD dwPtrB = (PDWORD) b; | |
138 | PDWORD dwPtrOut =(PDWORD) out; | |
139 | ||
140 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); | |
141 | } | |
142 | ||
143 | void AddRoundKey(BYTE *key, int round) | |
144 | { | |
145 | BYTE sbox_key[4]; | |
146 | BYTE rcon_table[10] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36}; | |
147 | ||
148 | sbox_key[0] = sbox_table[key[13]]; | |
149 | sbox_key[1] = sbox_table[key[14]]; | |
150 | sbox_key[2] = sbox_table[key[15]]; | |
151 | sbox_key[3] = sbox_table[key[12]]; | |
152 | ||
153 | key[0] = key[0] ^ rcon_table[round]; | |
154 | xor_32(&key[0], sbox_key, &key[0]); | |
155 | ||
156 | xor_32(&key[4], &key[0], &key[4]); | |
157 | xor_32(&key[8], &key[4], &key[8]); | |
158 | xor_32(&key[12], &key[8], &key[12]); | |
159 | } | |
160 | ||
161 | void SubBytes(BYTE *in, BYTE *out) | |
162 | { | |
163 | int i; | |
164 | ||
165 | for (i=0; i< 16; i++) | |
166 | { | |
167 | out[i] = sbox_table[in[i]]; | |
168 | } | |
169 | } | |
170 | ||
171 | void ShiftRows(BYTE *in, BYTE *out) | |
172 | { | |
173 | out[0] = in[0]; | |
174 | out[1] = in[5]; | |
175 | out[2] = in[10]; | |
176 | out[3] = in[15]; | |
177 | out[4] = in[4]; | |
178 | out[5] = in[9]; | |
179 | out[6] = in[14]; | |
180 | out[7] = in[3]; | |
181 | out[8] = in[8]; | |
182 | out[9] = in[13]; | |
183 | out[10] = in[2]; | |
184 | out[11] = in[7]; | |
185 | out[12] = in[12]; | |
186 | out[13] = in[1]; | |
187 | out[14] = in[6]; | |
188 | out[15] = in[11]; | |
189 | } | |
190 | ||
191 | void MixColumns(BYTE *in, BYTE *out) | |
192 | { | |
193 | ||
194 | out[0] = dot2_table[in[0]] ^ dot3_table[in[1]] ^ in[2] ^ in[3]; | |
195 | out[1] = in[0] ^ dot2_table[in[1]] ^ dot3_table[in[2]] ^ in[3]; | |
196 | out[2] = in[0] ^ in[1] ^ dot2_table[in[2]] ^ dot3_table[in[3]]; | |
197 | out[3] = dot3_table[in[0]] ^ in[1] ^ in[2] ^ dot2_table[in[3]]; | |
198 | } | |
199 | ||
200 | ||
201 | void AESv128(BYTE *key, BYTE *data, BYTE *ciphertext) | |
202 | { | |
203 | int i; | |
204 | int round; | |
205 | BYTE TmpdataA[16]; | |
206 | BYTE TmpdataB[16]; | |
207 | BYTE abyRoundKey[16]; | |
208 | ||
209 | for(i=0; i<16; i++) | |
210 | abyRoundKey[i] = key[i]; | |
211 | ||
212 | for (round = 0; round < 11; round++) | |
213 | { | |
214 | if (round == 0) | |
215 | { | |
216 | xor_128(abyRoundKey, data, ciphertext); | |
217 | AddRoundKey(abyRoundKey, round); | |
218 | } | |
219 | else if (round == 10) | |
220 | { | |
221 | SubBytes(ciphertext, TmpdataA); | |
222 | ShiftRows(TmpdataA, TmpdataB); | |
223 | xor_128(TmpdataB, abyRoundKey, ciphertext); | |
224 | } | |
225 | else // round 1 ~ 9 | |
226 | { | |
227 | SubBytes(ciphertext, TmpdataA); | |
228 | ShiftRows(TmpdataA, TmpdataB); | |
229 | MixColumns(&TmpdataB[0], &TmpdataA[0]); | |
230 | MixColumns(&TmpdataB[4], &TmpdataA[4]); | |
231 | MixColumns(&TmpdataB[8], &TmpdataA[8]); | |
232 | MixColumns(&TmpdataB[12], &TmpdataA[12]); | |
233 | xor_128(TmpdataA, abyRoundKey, ciphertext); | |
234 | AddRoundKey(abyRoundKey, round); | |
235 | } | |
236 | } | |
237 | ||
238 | } | |
239 | ||
240 | /* | |
241 | * Description: AES decryption | |
242 | * | |
243 | * Parameters: | |
244 | * In: | |
245 | * pbyRxKey - The key used to decrypt | |
246 | * pbyFrame - Starting address of packet header | |
247 | * wFrameSize - Total packet size including CRC | |
248 | * Out: | |
249 | * none | |
250 | * | |
251 | * Return Value: MIC compare result | |
252 | * | |
253 | */ | |
254 | BOOL AESbGenCCMP(PBYTE pbyRxKey, PBYTE pbyFrame, WORD wFrameSize) | |
255 | { | |
256 | BYTE abyNonce[13]; | |
257 | BYTE MIC_IV[16]; | |
258 | BYTE MIC_HDR1[16]; | |
259 | BYTE MIC_HDR2[16]; | |
260 | BYTE abyMIC[16]; | |
261 | BYTE abyCTRPLD[16]; | |
262 | BYTE abyTmp[16]; | |
263 | BYTE abyPlainText[16]; | |
264 | BYTE abyLastCipher[16]; | |
265 | ||
266 | PS802_11Header pMACHeader = (PS802_11Header) pbyFrame; | |
267 | PBYTE pbyIV; | |
268 | PBYTE pbyPayload; | |
269 | WORD wHLen = 22; | |
270 | WORD wPayloadSize = wFrameSize - 8 - 8 - 4 - WLAN_HDR_ADDR3_LEN;//8 is IV, 8 is MIC, 4 is CRC | |
271 | BOOL bA4 = FALSE; | |
272 | BYTE byTmp; | |
273 | WORD wCnt; | |
274 | int ii,jj,kk; | |
275 | ||
276 | ||
277 | pbyIV = pbyFrame + WLAN_HDR_ADDR3_LEN; | |
278 | if ( WLAN_GET_FC_TODS(*(PWORD)pbyFrame) && | |
279 | WLAN_GET_FC_FROMDS(*(PWORD)pbyFrame) ) { | |
280 | bA4 = TRUE; | |
281 | pbyIV += 6; // 6 is 802.11 address4 | |
282 | wHLen += 6; | |
283 | wPayloadSize -= 6; | |
284 | } | |
285 | pbyPayload = pbyIV + 8; //IV-length | |
286 | ||
287 | abyNonce[0] = 0x00; //now is 0, if Qos here will be priority | |
288 | MEMvCopy(&(abyNonce[1]), pMACHeader->abyAddr2, U_ETHER_ADDR_LEN); | |
289 | abyNonce[7] = pbyIV[7]; | |
290 | abyNonce[8] = pbyIV[6]; | |
291 | abyNonce[9] = pbyIV[5]; | |
292 | abyNonce[10] = pbyIV[4]; | |
293 | abyNonce[11] = pbyIV[1]; | |
294 | abyNonce[12] = pbyIV[0]; | |
295 | ||
296 | //MIC_IV | |
297 | MIC_IV[0] = 0x59; | |
298 | MEMvCopy(&(MIC_IV[1]), &(abyNonce[0]), 13); | |
299 | MIC_IV[14] = (BYTE)(wPayloadSize >> 8); | |
300 | MIC_IV[15] = (BYTE)(wPayloadSize & 0xff); | |
301 | ||
302 | //MIC_HDR1 | |
303 | MIC_HDR1[0] = (BYTE)(wHLen >> 8); | |
304 | MIC_HDR1[1] = (BYTE)(wHLen & 0xff); | |
305 | byTmp = (BYTE)(pMACHeader->wFrameCtl & 0xff); | |
306 | MIC_HDR1[2] = byTmp & 0x8f; | |
307 | byTmp = (BYTE)(pMACHeader->wFrameCtl >> 8); | |
308 | byTmp &= 0x87; | |
309 | MIC_HDR1[3] = byTmp | 0x40; | |
310 | MEMvCopy(&(MIC_HDR1[4]), pMACHeader->abyAddr1, U_ETHER_ADDR_LEN); | |
311 | MEMvCopy(&(MIC_HDR1[10]), pMACHeader->abyAddr2, U_ETHER_ADDR_LEN); | |
312 | ||
313 | //MIC_HDR2 | |
314 | MEMvCopy(&(MIC_HDR2[0]), pMACHeader->abyAddr3, U_ETHER_ADDR_LEN); | |
315 | byTmp = (BYTE)(pMACHeader->wSeqCtl & 0xff); | |
316 | MIC_HDR2[6] = byTmp & 0x0f; | |
317 | MIC_HDR2[7] = 0; | |
318 | if ( bA4 ) { | |
319 | MEMvCopy(&(MIC_HDR2[8]), pMACHeader->abyAddr4, U_ETHER_ADDR_LEN); | |
320 | } else { | |
321 | MIC_HDR2[8] = 0x00; | |
322 | MIC_HDR2[9] = 0x00; | |
323 | MIC_HDR2[10] = 0x00; | |
324 | MIC_HDR2[11] = 0x00; | |
325 | MIC_HDR2[12] = 0x00; | |
326 | MIC_HDR2[13] = 0x00; | |
327 | } | |
328 | MIC_HDR2[14] = 0x00; | |
329 | MIC_HDR2[15] = 0x00; | |
330 | ||
331 | //CCMP | |
332 | AESv128(pbyRxKey,MIC_IV,abyMIC); | |
333 | for ( kk=0; kk<16; kk++ ) { | |
334 | abyTmp[kk] = MIC_HDR1[kk] ^ abyMIC[kk]; | |
335 | } | |
336 | AESv128(pbyRxKey,abyTmp,abyMIC); | |
337 | for ( kk=0; kk<16; kk++ ) { | |
338 | abyTmp[kk] = MIC_HDR2[kk] ^ abyMIC[kk]; | |
339 | } | |
340 | AESv128(pbyRxKey,abyTmp,abyMIC); | |
341 | ||
342 | wCnt = 1; | |
343 | abyCTRPLD[0] = 0x01; | |
344 | MEMvCopy(&(abyCTRPLD[1]), &(abyNonce[0]), 13); | |
345 | ||
346 | for(jj=wPayloadSize; jj>16; jj=jj-16) { | |
347 | ||
348 | abyCTRPLD[14] = (BYTE) (wCnt >> 8); | |
349 | abyCTRPLD[15] = (BYTE) (wCnt & 0xff); | |
350 | ||
351 | AESv128(pbyRxKey,abyCTRPLD,abyTmp); | |
352 | ||
353 | for ( kk=0; kk<16; kk++ ) { | |
354 | abyPlainText[kk] = abyTmp[kk] ^ pbyPayload[kk]; | |
355 | } | |
356 | for ( kk=0; kk<16; kk++ ) { | |
357 | abyTmp[kk] = abyMIC[kk] ^ abyPlainText[kk]; | |
358 | } | |
359 | AESv128(pbyRxKey,abyTmp,abyMIC); | |
360 | ||
361 | MEMvCopy(pbyPayload, abyPlainText, 16); | |
362 | wCnt++; | |
363 | pbyPayload += 16; | |
364 | } //for wPayloadSize | |
365 | ||
366 | //last payload | |
367 | MEMvCopy(&(abyLastCipher[0]), pbyPayload, jj); | |
368 | for ( ii=jj; ii<16; ii++ ) { | |
369 | abyLastCipher[ii] = 0x00; | |
370 | } | |
371 | ||
372 | abyCTRPLD[14] = (BYTE) (wCnt >> 8); | |
373 | abyCTRPLD[15] = (BYTE) (wCnt & 0xff); | |
374 | ||
375 | AESv128(pbyRxKey,abyCTRPLD,abyTmp); | |
376 | for ( kk=0; kk<16; kk++ ) { | |
377 | abyPlainText[kk] = abyTmp[kk] ^ abyLastCipher[kk]; | |
378 | } | |
379 | MEMvCopy(pbyPayload, abyPlainText, jj); | |
380 | pbyPayload += jj; | |
381 | ||
382 | //for MIC calculation | |
383 | for ( ii=jj; ii<16; ii++ ) { | |
384 | abyPlainText[ii] = 0x00; | |
385 | } | |
386 | for ( kk=0; kk<16; kk++ ) { | |
387 | abyTmp[kk] = abyMIC[kk] ^ abyPlainText[kk]; | |
388 | } | |
389 | AESv128(pbyRxKey,abyTmp,abyMIC); | |
390 | ||
391 | //=>above is the calculate MIC | |
392 | //-------------------------------------------- | |
393 | ||
394 | wCnt = 0; | |
395 | abyCTRPLD[14] = (BYTE) (wCnt >> 8); | |
396 | abyCTRPLD[15] = (BYTE) (wCnt & 0xff); | |
397 | AESv128(pbyRxKey,abyCTRPLD,abyTmp); | |
398 | for ( kk=0; kk<8; kk++ ) { | |
399 | abyTmp[kk] = abyTmp[kk] ^ pbyPayload[kk]; | |
400 | } | |
401 | //=>above is the dec-MIC from packet | |
402 | //-------------------------------------------- | |
403 | ||
404 | if ( MEMEqualMemory(abyMIC,abyTmp,8) ) { | |
405 | return TRUE; | |
406 | } else { | |
407 | return FALSE; | |
408 | } | |
409 | ||
410 | } |