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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/staging/vt6656/aes_ccmp.c
2 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
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.
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.
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.
21 * Purpose: AES_CCMP decryption
28 * AESbGenCCMP - Parsing RX-packet
40 static u8 sbox_table
[256] = {
41 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
42 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
43 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
44 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
45 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
46 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
47 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
48 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
49 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
50 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
51 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
52 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
53 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
54 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
55 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
56 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
59 static u8 dot2_table
[256] = {
60 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e,
61 0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e,
62 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e,
63 0x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e,
64 0x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e,
65 0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe,
66 0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde,
67 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe,
68 0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05,
69 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25,
70 0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45,
71 0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65,
72 0x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85,
73 0xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5,
74 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5,
75 0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5
78 static u8 dot3_table
[256] = {
79 0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, 0x12, 0x11,
80 0x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21,
81 0x60, 0x63, 0x66, 0x65, 0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71,
82 0x50, 0x53, 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41,
83 0xc0, 0xc3, 0xc6, 0xc5, 0xcc, 0xcf, 0xca, 0xc9, 0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1,
84 0xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1,
85 0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, 0xb8, 0xbb, 0xbe, 0xbd, 0xb4, 0xb7, 0xb2, 0xb1,
86 0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81,
87 0x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, 0x8f, 0x8c, 0x89, 0x8a,
88 0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, 0xb9, 0xba,
89 0xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea,
90 0xcb, 0xc8, 0xcd, 0xce, 0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda,
91 0x5b, 0x58, 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a,
92 0x6b, 0x68, 0x6d, 0x6e, 0x67, 0x64, 0x61, 0x62, 0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a,
93 0x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a,
94 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, 0x13, 0x10, 0x15, 0x16, 0x1f, 0x1c, 0x19, 0x1a
97 static void xor_128(u8
*a
, u8
*b
, u8
*out
)
99 u32
*dwPtrA
= (u32
*) a
;
100 u32
*dwPtrB
= (u32
*) b
;
101 u32
*dwPtrOut
= (u32
*) out
;
103 (*dwPtrOut
++) = (*dwPtrA
++) ^ (*dwPtrB
++);
104 (*dwPtrOut
++) = (*dwPtrA
++) ^ (*dwPtrB
++);
105 (*dwPtrOut
++) = (*dwPtrA
++) ^ (*dwPtrB
++);
106 (*dwPtrOut
++) = (*dwPtrA
++) ^ (*dwPtrB
++);
109 static void xor_32(u8
*a
, u8
*b
, u8
*out
)
111 u32
*dwPtrA
= (u32
*) a
;
112 u32
*dwPtrB
= (u32
*) b
;
113 u32
*dwPtrOut
= (u32
*) out
;
115 (*dwPtrOut
++) = (*dwPtrA
++) ^ (*dwPtrB
++);
118 static void AddRoundKey(u8
*key
, int round
)
121 u8 rcon_table
[10] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};
123 sbox_key
[0] = sbox_table
[key
[13]];
124 sbox_key
[1] = sbox_table
[key
[14]];
125 sbox_key
[2] = sbox_table
[key
[15]];
126 sbox_key
[3] = sbox_table
[key
[12]];
128 key
[0] = key
[0] ^ rcon_table
[round
];
129 xor_32(&key
[0], sbox_key
, &key
[0]);
131 xor_32(&key
[4], &key
[0], &key
[4]);
132 xor_32(&key
[8], &key
[4], &key
[8]);
133 xor_32(&key
[12], &key
[8], &key
[12]);
136 static void SubBytes(u8
*in
, u8
*out
)
140 for (i
= 0; i
< 16; i
++)
141 out
[i
] = sbox_table
[in
[i
]];
144 static void ShiftRows(u8
*in
, u8
*out
)
164 static void MixColumns(u8
*in
, u8
*out
)
167 out
[0] = dot2_table
[in
[0]] ^ dot3_table
[in
[1]] ^ in
[2] ^ in
[3];
168 out
[1] = in
[0] ^ dot2_table
[in
[1]] ^ dot3_table
[in
[2]] ^ in
[3];
169 out
[2] = in
[0] ^ in
[1] ^ dot2_table
[in
[2]] ^ dot3_table
[in
[3]];
170 out
[3] = dot3_table
[in
[0]] ^ in
[1] ^ in
[2] ^ dot2_table
[in
[3]];
173 static void AESv128(u8
*key
, u8
*data
, u8
*ciphertext
)
181 for (i
= 0; i
< 16; i
++)
182 abyRoundKey
[i
] = key
[i
];
184 for (round
= 0; round
< 11; round
++) {
186 xor_128(abyRoundKey
, data
, ciphertext
);
187 AddRoundKey(abyRoundKey
, round
);
188 } else if (round
== 10) {
189 SubBytes(ciphertext
, TmpdataA
);
190 ShiftRows(TmpdataA
, TmpdataB
);
191 xor_128(TmpdataB
, abyRoundKey
, ciphertext
);
192 } else { /* round 1 ~ 9 */
193 SubBytes(ciphertext
, TmpdataA
);
194 ShiftRows(TmpdataA
, TmpdataB
);
195 MixColumns(&TmpdataB
[0], &TmpdataA
[0]);
196 MixColumns(&TmpdataB
[4], &TmpdataA
[4]);
197 MixColumns(&TmpdataB
[8], &TmpdataA
[8]);
198 MixColumns(&TmpdataB
[12], &TmpdataA
[12]);
199 xor_128(TmpdataA
, abyRoundKey
, ciphertext
);
200 AddRoundKey(abyRoundKey
, round
);
207 * Description: AES decryption
211 * pbyRxKey - The key used to decrypt
212 * pbyFrame - Starting address of packet header
213 * wFrameSize - Total packet size including CRC
217 * Return Value: MIC compare result
221 bool AESbGenCCMP(u8
*pbyRxKey
, u8
*pbyFrame
, u16 wFrameSize
)
231 u8 abyLastCipher
[16];
233 struct ieee80211_hdr
*pMACHeader
= (struct ieee80211_hdr
*) pbyFrame
;
237 /* 8 is IV, 8 is MIC, 4 is CRC */
238 u16 wPayloadSize
= wFrameSize
- 8 - 8 - 4 - WLAN_HDR_ADDR3_LEN
;
244 pbyIV
= pbyFrame
+ WLAN_HDR_ADDR3_LEN
;
245 if (WLAN_GET_FC_TODS(*(u16
*) pbyFrame
) &&
246 WLAN_GET_FC_FROMDS(*(u16
*) pbyFrame
)) {
248 pbyIV
+= 6; /* 6 is 802.11 address4 */
252 pbyPayload
= pbyIV
+ 8; /* IV-length */
254 abyNonce
[0] = 0x00; /* now is 0, if Qos here will be priority */
255 memcpy(&(abyNonce
[1]), pMACHeader
->addr2
, ETH_ALEN
);
256 abyNonce
[7] = pbyIV
[7];
257 abyNonce
[8] = pbyIV
[6];
258 abyNonce
[9] = pbyIV
[5];
259 abyNonce
[10] = pbyIV
[4];
260 abyNonce
[11] = pbyIV
[1];
261 abyNonce
[12] = pbyIV
[0];
265 memcpy(&(MIC_IV
[1]), &(abyNonce
[0]), 13);
266 MIC_IV
[14] = (u8
)(wPayloadSize
>> 8);
267 MIC_IV
[15] = (u8
)(wPayloadSize
& 0xff);
270 MIC_HDR1
[0] = (u8
)(wHLen
>> 8);
271 MIC_HDR1
[1] = (u8
)(wHLen
& 0xff);
272 byTmp
= (u8
)(pMACHeader
->frame_control
& 0xff);
273 MIC_HDR1
[2] = byTmp
& 0x8f;
274 byTmp
= (u8
)(pMACHeader
->frame_control
>> 8);
276 MIC_HDR1
[3] = byTmp
| 0x40;
277 memcpy(&(MIC_HDR1
[4]), pMACHeader
->addr1
, ETH_ALEN
);
278 memcpy(&(MIC_HDR1
[10]), pMACHeader
->addr2
, ETH_ALEN
);
281 memcpy(&(MIC_HDR2
[0]), pMACHeader
->addr3
, ETH_ALEN
);
282 byTmp
= (u8
)(pMACHeader
->seq_ctrl
& 0xff);
283 MIC_HDR2
[6] = byTmp
& 0x0f;
287 memcpy(&(MIC_HDR2
[8]), pMACHeader
->addr4
, ETH_ALEN
);
300 AESv128(pbyRxKey
, MIC_IV
, abyMIC
);
301 for (kk
= 0; kk
< 16; kk
++)
302 abyTmp
[kk
] = MIC_HDR1
[kk
] ^ abyMIC
[kk
];
304 AESv128(pbyRxKey
, abyTmp
, abyMIC
);
305 for (kk
= 0; kk
< 16; kk
++)
306 abyTmp
[kk
] = MIC_HDR2
[kk
] ^ abyMIC
[kk
];
308 AESv128(pbyRxKey
, abyTmp
, abyMIC
);
312 memcpy(&(abyCTRPLD
[1]), &(abyNonce
[0]), 13);
314 for (jj
= wPayloadSize
; jj
> 16; jj
= jj
-16) {
316 abyCTRPLD
[14] = (u8
) (wCnt
>> 8);
317 abyCTRPLD
[15] = (u8
) (wCnt
& 0xff);
319 AESv128(pbyRxKey
, abyCTRPLD
, abyTmp
);
321 for (kk
= 0; kk
< 16; kk
++)
322 abyPlainText
[kk
] = abyTmp
[kk
] ^ pbyPayload
[kk
];
324 for (kk
= 0; kk
< 16; kk
++)
325 abyTmp
[kk
] = abyMIC
[kk
] ^ abyPlainText
[kk
];
327 AESv128(pbyRxKey
, abyTmp
, abyMIC
);
329 memcpy(pbyPayload
, abyPlainText
, 16);
332 } /* for wPayloadSize */
335 memcpy(&(abyLastCipher
[0]), pbyPayload
, jj
);
336 for (ii
= jj
; ii
< 16; ii
++)
337 abyLastCipher
[ii
] = 0x00;
339 abyCTRPLD
[14] = (u8
) (wCnt
>> 8);
340 abyCTRPLD
[15] = (u8
) (wCnt
& 0xff);
342 AESv128(pbyRxKey
, abyCTRPLD
, abyTmp
);
343 for (kk
= 0; kk
< 16; kk
++)
344 abyPlainText
[kk
] = abyTmp
[kk
] ^ abyLastCipher
[kk
];
346 memcpy(pbyPayload
, abyPlainText
, jj
);
349 /* for MIC calculation */
350 for (ii
= jj
; ii
< 16; ii
++)
351 abyPlainText
[ii
] = 0x00;
352 for (kk
= 0; kk
< 16; kk
++)
353 abyTmp
[kk
] = abyMIC
[kk
] ^ abyPlainText
[kk
];
355 AESv128(pbyRxKey
, abyTmp
, abyMIC
);
357 /* => above is the calculated MIC */
360 abyCTRPLD
[14] = (u8
) (wCnt
>> 8);
361 abyCTRPLD
[15] = (u8
) (wCnt
& 0xff);
362 AESv128(pbyRxKey
, abyCTRPLD
, abyTmp
);
364 for (kk
= 0; kk
< 8; kk
++)
365 abyTmp
[kk
] = abyTmp
[kk
] ^ pbyPayload
[kk
];
367 /* => above is the packet dec-MIC */
369 if (!memcmp(abyMIC
, abyTmp
, 8))