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92b96797 FB |
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 | * | |
92b96797 FB |
19 | * File: aes_ccmp.c |
20 | * | |
21 | * Purpose: AES_CCMP decryption | |
22 | * | |
23 | * Author: Warren Hsu | |
24 | * | |
25 | * Date: Feb 15, 2005 | |
26 | * | |
27 | * Functions: | |
28 | * AESbGenCCMP - Parsing RX-packet | |
29 | * | |
92b96797 | 30 | * Revision History: |
92b96797 FB |
31 | */ |
32 | ||
92b96797 | 33 | #include "device.h" |
92b96797 | 34 | #include "80211hdr.h" |
92b96797 FB |
35 | |
36 | /*--------------------- Static Definitions -------------------------*/ | |
37 | ||
38 | /*--------------------- Static Classes ----------------------------*/ | |
39 | ||
40 | /*--------------------- Static Variables --------------------------*/ | |
41 | ||
42 | /* | |
43 | * SBOX Table | |
44 | */ | |
45 | ||
8ff23777 AM |
46 | BYTE sbox_table[256] = { |
47 | 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, | |
48 | 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, | |
49 | 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, | |
50 | 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, | |
51 | 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, | |
52 | 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, | |
53 | 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, | |
54 | 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, | |
55 | 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, | |
56 | 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, | |
57 | 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, | |
58 | 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, | |
59 | 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, | |
60 | 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, | |
61 | 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, | |
62 | 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 | |
92b96797 FB |
63 | }; |
64 | ||
65 | BYTE dot2_table[256] = { | |
8ff23777 AM |
66 | 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e, |
67 | 0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, | |
68 | 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, | |
69 | 0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, | |
70 | 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, | |
71 | 0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, | |
72 | 0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde, | |
73 | 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, | |
74 | 0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05, | |
75 | 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25, | |
76 | 0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, | |
77 | 0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65, | |
78 | 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, | |
79 | 0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5, | |
80 | 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5, | |
81 | 0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5 | |
92b96797 FB |
82 | }; |
83 | ||
84 | BYTE dot3_table[256] = { | |
8ff23777 AM |
85 | 0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, 0x12, 0x11, |
86 | 0x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21, | |
87 | 0x60, 0x63, 0x66, 0x65, 0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71, | |
88 | 0x50, 0x53, 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41, | |
89 | 0xc0, 0xc3, 0xc6, 0xc5, 0xcc, 0xcf, 0xca, 0xc9, 0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1, | |
90 | 0xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1, | |
91 | 0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, 0xb8, 0xbb, 0xbe, 0xbd, 0xb4, 0xb7, 0xb2, 0xb1, | |
92 | 0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81, | |
93 | 0x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, 0x8f, 0x8c, 0x89, 0x8a, | |
94 | 0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, 0xb9, 0xba, | |
95 | 0xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea, | |
96 | 0xcb, 0xc8, 0xcd, 0xce, 0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda, | |
97 | 0x5b, 0x58, 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a, | |
98 | 0x6b, 0x68, 0x6d, 0x6e, 0x67, 0x64, 0x61, 0x62, 0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a, | |
99 | 0x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a, | |
100 | 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, 0x13, 0x10, 0x15, 0x16, 0x1f, 0x1c, 0x19, 0x1a | |
92b96797 FB |
101 | }; |
102 | ||
103 | /*--------------------- Static Functions --------------------------*/ | |
104 | ||
105 | /*--------------------- Export Variables --------------------------*/ | |
106 | ||
107 | /*--------------------- Export Functions --------------------------*/ | |
108 | ||
d500648e | 109 | static void xor_128(BYTE *a, BYTE *b, BYTE *out) |
92b96797 | 110 | { |
8ff23777 AM |
111 | PDWORD dwPtrA = (PDWORD) a; |
112 | PDWORD dwPtrB = (PDWORD) b; | |
113 | PDWORD dwPtrOut = (PDWORD) out; | |
114 | ||
115 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); | |
116 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); | |
117 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); | |
118 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); | |
92b96797 FB |
119 | } |
120 | ||
121 | ||
d500648e | 122 | static void xor_32(BYTE *a, BYTE *b, BYTE *out) |
92b96797 | 123 | { |
8ff23777 AM |
124 | PDWORD dwPtrA = (PDWORD) a; |
125 | PDWORD dwPtrB = (PDWORD) b; | |
126 | PDWORD dwPtrOut = (PDWORD) out; | |
92b96797 | 127 | |
8ff23777 | 128 | (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++); |
92b96797 FB |
129 | } |
130 | ||
131 | void AddRoundKey(BYTE *key, int round) | |
132 | { | |
8ff23777 AM |
133 | BYTE sbox_key[4]; |
134 | BYTE rcon_table[10] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36}; | |
92b96797 | 135 | |
8ff23777 AM |
136 | sbox_key[0] = sbox_table[key[13]]; |
137 | sbox_key[1] = sbox_table[key[14]]; | |
138 | sbox_key[2] = sbox_table[key[15]]; | |
139 | sbox_key[3] = sbox_table[key[12]]; | |
92b96797 | 140 | |
8ff23777 AM |
141 | key[0] = key[0] ^ rcon_table[round]; |
142 | xor_32(&key[0], sbox_key, &key[0]); | |
92b96797 | 143 | |
8ff23777 AM |
144 | xor_32(&key[4], &key[0], &key[4]); |
145 | xor_32(&key[8], &key[4], &key[8]); | |
146 | xor_32(&key[12], &key[8], &key[12]); | |
92b96797 FB |
147 | } |
148 | ||
149 | void SubBytes(BYTE *in, BYTE *out) | |
150 | { | |
8ff23777 | 151 | int i; |
92b96797 | 152 | |
8ff23777 AM |
153 | for (i = 0; i < 16; i++) |
154 | out[i] = sbox_table[in[i]]; | |
92b96797 FB |
155 | } |
156 | ||
157 | void ShiftRows(BYTE *in, BYTE *out) | |
158 | { | |
8ff23777 AM |
159 | out[0] = in[0]; |
160 | out[1] = in[5]; | |
161 | out[2] = in[10]; | |
162 | out[3] = in[15]; | |
163 | out[4] = in[4]; | |
164 | out[5] = in[9]; | |
165 | out[6] = in[14]; | |
166 | out[7] = in[3]; | |
167 | out[8] = in[8]; | |
168 | out[9] = in[13]; | |
169 | out[10] = in[2]; | |
170 | out[11] = in[7]; | |
171 | out[12] = in[12]; | |
172 | out[13] = in[1]; | |
173 | out[14] = in[6]; | |
174 | out[15] = in[11]; | |
92b96797 FB |
175 | } |
176 | ||
177 | void MixColumns(BYTE *in, BYTE *out) | |
178 | { | |
179 | ||
8ff23777 AM |
180 | out[0] = dot2_table[in[0]] ^ dot3_table[in[1]] ^ in[2] ^ in[3]; |
181 | out[1] = in[0] ^ dot2_table[in[1]] ^ dot3_table[in[2]] ^ in[3]; | |
182 | out[2] = in[0] ^ in[1] ^ dot2_table[in[2]] ^ dot3_table[in[3]]; | |
183 | out[3] = dot3_table[in[0]] ^ in[1] ^ in[2] ^ dot2_table[in[3]]; | |
92b96797 FB |
184 | } |
185 | ||
92b96797 FB |
186 | void AESv128(BYTE *key, BYTE *data, BYTE *ciphertext) |
187 | { | |
8ff23777 AM |
188 | int i; |
189 | int round; | |
190 | BYTE TmpdataA[16]; | |
191 | BYTE TmpdataB[16]; | |
192 | BYTE abyRoundKey[16]; | |
193 | ||
194 | for (i = 0; i < 16; i++) | |
195 | abyRoundKey[i] = key[i]; | |
196 | ||
197 | for (round = 0; round < 11; round++) { | |
198 | if (round == 0) { | |
199 | xor_128(abyRoundKey, data, ciphertext); | |
200 | AddRoundKey(abyRoundKey, round); | |
201 | } else if (round == 10) { | |
202 | SubBytes(ciphertext, TmpdataA); | |
203 | ShiftRows(TmpdataA, TmpdataB); | |
204 | xor_128(TmpdataB, abyRoundKey, ciphertext); | |
205 | } else { /* round 1 ~ 9 */ | |
206 | SubBytes(ciphertext, TmpdataA); | |
207 | ShiftRows(TmpdataA, TmpdataB); | |
208 | MixColumns(&TmpdataB[0], &TmpdataA[0]); | |
209 | MixColumns(&TmpdataB[4], &TmpdataA[4]); | |
210 | MixColumns(&TmpdataB[8], &TmpdataA[8]); | |
211 | MixColumns(&TmpdataB[12], &TmpdataA[12]); | |
212 | xor_128(TmpdataA, abyRoundKey, ciphertext); | |
213 | AddRoundKey(abyRoundKey, round); | |
214 | } | |
215 | } | |
92b96797 FB |
216 | |
217 | } | |
218 | ||
219 | /* | |
220 | * Description: AES decryption | |
221 | * | |
222 | * Parameters: | |
223 | * In: | |
224 | * pbyRxKey - The key used to decrypt | |
225 | * pbyFrame - Starting address of packet header | |
226 | * wFrameSize - Total packet size including CRC | |
227 | * Out: | |
228 | * none | |
229 | * | |
230 | * Return Value: MIC compare result | |
231 | * | |
232 | */ | |
8ff23777 | 233 | |
92b96797 FB |
234 | BOOL AESbGenCCMP(PBYTE pbyRxKey, PBYTE pbyFrame, WORD wFrameSize) |
235 | { | |
8ff23777 AM |
236 | BYTE abyNonce[13]; |
237 | BYTE MIC_IV[16]; | |
238 | BYTE MIC_HDR1[16]; | |
239 | BYTE MIC_HDR2[16]; | |
240 | BYTE abyMIC[16]; | |
241 | BYTE abyCTRPLD[16]; | |
242 | BYTE abyTmp[16]; | |
243 | BYTE abyPlainText[16]; | |
244 | BYTE abyLastCipher[16]; | |
245 | ||
246 | PS802_11Header pMACHeader = (PS802_11Header) pbyFrame; | |
247 | PBYTE pbyIV; | |
248 | PBYTE pbyPayload; | |
249 | WORD wHLen = 22; | |
250 | /* 8 is IV, 8 is MIC, 4 is CRC */ | |
251 | WORD wPayloadSize = wFrameSize - 8 - 8 - 4 - WLAN_HDR_ADDR3_LEN; | |
252 | BOOL bA4 = FALSE; | |
253 | BYTE byTmp; | |
254 | WORD wCnt; | |
255 | int ii, jj, kk; | |
256 | ||
257 | pbyIV = pbyFrame + WLAN_HDR_ADDR3_LEN; | |
258 | if (WLAN_GET_FC_TODS(*(PWORD) pbyFrame) && | |
259 | WLAN_GET_FC_FROMDS(*(PWORD) pbyFrame)) { | |
260 | bA4 = TRUE; | |
261 | pbyIV += 6; /* 6 is 802.11 address4 */ | |
262 | wHLen += 6; | |
263 | wPayloadSize -= 6; | |
264 | } | |
265 | pbyPayload = pbyIV + 8; /* IV-length */ | |
266 | ||
267 | abyNonce[0] = 0x00; /* now is 0, if Qos here will be priority */ | |
268 | memcpy(&(abyNonce[1]), pMACHeader->abyAddr2, ETH_ALEN); | |
269 | abyNonce[7] = pbyIV[7]; | |
270 | abyNonce[8] = pbyIV[6]; | |
271 | abyNonce[9] = pbyIV[5]; | |
272 | abyNonce[10] = pbyIV[4]; | |
273 | abyNonce[11] = pbyIV[1]; | |
274 | abyNonce[12] = pbyIV[0]; | |
275 | ||
276 | /* MIC_IV */ | |
277 | MIC_IV[0] = 0x59; | |
278 | memcpy(&(MIC_IV[1]), &(abyNonce[0]), 13); | |
279 | MIC_IV[14] = (BYTE)(wPayloadSize >> 8); | |
280 | MIC_IV[15] = (BYTE)(wPayloadSize & 0xff); | |
281 | ||
282 | /* MIC_HDR1 */ | |
283 | MIC_HDR1[0] = (BYTE)(wHLen >> 8); | |
284 | MIC_HDR1[1] = (BYTE)(wHLen & 0xff); | |
285 | byTmp = (BYTE)(pMACHeader->wFrameCtl & 0xff); | |
286 | MIC_HDR1[2] = byTmp & 0x8f; | |
287 | byTmp = (BYTE)(pMACHeader->wFrameCtl >> 8); | |
288 | byTmp &= 0x87; | |
289 | MIC_HDR1[3] = byTmp | 0x40; | |
290 | memcpy(&(MIC_HDR1[4]), pMACHeader->abyAddr1, ETH_ALEN); | |
291 | memcpy(&(MIC_HDR1[10]), pMACHeader->abyAddr2, ETH_ALEN); | |
292 | ||
293 | /* MIC_HDR2 */ | |
294 | memcpy(&(MIC_HDR2[0]), pMACHeader->abyAddr3, ETH_ALEN); | |
295 | byTmp = (BYTE)(pMACHeader->wSeqCtl & 0xff); | |
296 | MIC_HDR2[6] = byTmp & 0x0f; | |
297 | MIC_HDR2[7] = 0; | |
298 | ||
299 | if (bA4) { | |
9a0e756c | 300 | memcpy(&(MIC_HDR2[8]), pMACHeader->abyAddr4, ETH_ALEN); |
8ff23777 AM |
301 | } else { |
302 | MIC_HDR2[8] = 0x00; | |
303 | MIC_HDR2[9] = 0x00; | |
304 | MIC_HDR2[10] = 0x00; | |
305 | MIC_HDR2[11] = 0x00; | |
306 | MIC_HDR2[12] = 0x00; | |
307 | MIC_HDR2[13] = 0x00; | |
308 | } | |
309 | MIC_HDR2[14] = 0x00; | |
310 | MIC_HDR2[15] = 0x00; | |
311 | ||
312 | /* CCMP */ | |
313 | AESv128(pbyRxKey, MIC_IV, abyMIC); | |
314 | for (kk = 0; kk < 16; kk++) | |
315 | abyTmp[kk] = MIC_HDR1[kk] ^ abyMIC[kk]; | |
316 | ||
317 | AESv128(pbyRxKey, abyTmp, abyMIC); | |
318 | for (kk = 0; kk < 16; kk++) | |
319 | abyTmp[kk] = MIC_HDR2[kk] ^ abyMIC[kk]; | |
320 | ||
321 | AESv128(pbyRxKey, abyTmp, abyMIC); | |
322 | ||
323 | wCnt = 1; | |
324 | abyCTRPLD[0] = 0x01; | |
325 | memcpy(&(abyCTRPLD[1]), &(abyNonce[0]), 13); | |
326 | ||
327 | for (jj = wPayloadSize; jj > 16; jj = jj-16) { | |
328 | ||
329 | abyCTRPLD[14] = (BYTE) (wCnt >> 8); | |
330 | abyCTRPLD[15] = (BYTE) (wCnt & 0xff); | |
331 | ||
332 | AESv128(pbyRxKey, abyCTRPLD, abyTmp); | |
333 | ||
334 | for (kk = 0; kk < 16; kk++) | |
335 | abyPlainText[kk] = abyTmp[kk] ^ pbyPayload[kk]; | |
336 | ||
337 | for (kk = 0; kk < 16; kk++) | |
338 | abyTmp[kk] = abyMIC[kk] ^ abyPlainText[kk]; | |
339 | ||
340 | AESv128(pbyRxKey, abyTmp, abyMIC); | |
341 | ||
342 | memcpy(pbyPayload, abyPlainText, 16); | |
343 | wCnt++; | |
344 | pbyPayload += 16; | |
345 | } /* for wPayloadSize */ | |
346 | ||
347 | /* last payload */ | |
348 | memcpy(&(abyLastCipher[0]), pbyPayload, jj); | |
349 | for (ii = jj; ii < 16; ii++) | |
350 | abyLastCipher[ii] = 0x00; | |
351 | ||
352 | abyCTRPLD[14] = (BYTE) (wCnt >> 8); | |
353 | abyCTRPLD[15] = (BYTE) (wCnt & 0xff); | |
354 | ||
355 | AESv128(pbyRxKey, abyCTRPLD, abyTmp); | |
356 | for (kk = 0; kk < 16; kk++) | |
357 | abyPlainText[kk] = abyTmp[kk] ^ abyLastCipher[kk]; | |
358 | ||
359 | memcpy(pbyPayload, abyPlainText, jj); | |
360 | pbyPayload += jj; | |
361 | ||
362 | /* for MIC calculation */ | |
363 | for (ii = jj; ii < 16; ii++) | |
364 | abyPlainText[ii] = 0x00; | |
365 | for (kk = 0; kk < 16; kk++) | |
366 | abyTmp[kk] = abyMIC[kk] ^ abyPlainText[kk]; | |
367 | ||
368 | AESv128(pbyRxKey, abyTmp, abyMIC); | |
369 | ||
370 | /* => above is the calculated MIC */ | |
371 | ||
372 | wCnt = 0; | |
373 | abyCTRPLD[14] = (BYTE) (wCnt >> 8); | |
374 | abyCTRPLD[15] = (BYTE) (wCnt & 0xff); | |
375 | AESv128(pbyRxKey, abyCTRPLD, abyTmp); | |
376 | ||
377 | for (kk = 0; kk < 8; kk++) | |
378 | abyTmp[kk] = abyTmp[kk] ^ pbyPayload[kk]; | |
379 | ||
380 | /* => above is the packet dec-MIC */ | |
92b96797 | 381 | |
8ff23777 AM |
382 | if (!memcmp(abyMIC, abyTmp, 8)) |
383 | return TRUE; | |
384 | else | |
385 | return FALSE; | |
92b96797 | 386 | } |