aes_ccmp.c revision 5449c685a4b39534f18869a93896370224463715 
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
57BYTE sbox_table[256] =
58{
590x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
600xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
610xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
620x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
630x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
640x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
650xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
660x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
670xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
680x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
690xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
700xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
710xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
720x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
730xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
740x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
75};
76
77BYTE dot2_table[256] = {
780x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, 0x1c, 0x1e,
790x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e,
800x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e,
810x60, 0x62, 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e,
820x80, 0x82, 0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e,
830xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe,
840xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde,
850xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe,
860x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, 0x03, 0x01, 0x07, 0x05,
870x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, 0x27, 0x25,
880x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45,
890x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65,
900x9b, 0x99, 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85,
910xbb, 0xb9, 0xbf, 0xbd, 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5,
920xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5,
930xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5
94};
95
96BYTE dot3_table[256] = {
970x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, 0x12, 0x11,
980x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21,
990x60, 0x63, 0x66, 0x65, 0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71,
1000x50, 0x53, 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41,
1010xc0, 0xc3, 0xc6, 0xc5, 0xcc, 0xcf, 0xca, 0xc9, 0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1,
1020xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1,
1030xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, 0xb8, 0xbb, 0xbe, 0xbd, 0xb4, 0xb7, 0xb2, 0xb1,
1040x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81,
1050x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, 0x8f, 0x8c, 0x89, 0x8a,
1060xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, 0xb9, 0xba,
1070xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea,
1080xcb, 0xc8, 0xcd, 0xce, 0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda,
1090x5b, 0x58, 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a,
1100x6b, 0x68, 0x6d, 0x6e, 0x67, 0x64, 0x61, 0x62, 0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a,
1110x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a,
1120x0b, 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
121void xor_128(BYTE *a, BYTE *b, BYTE *out)
122{
123PDWORD dwPtrA = (PDWORD) a;
124PDWORD dwPtrB = (PDWORD) b;
125PDWORD dwPtrOut =(PDWORD) out;
126
127    (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
128    (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
129    (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
130    (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
131}
132
133
134void xor_32(BYTE *a, BYTE *b, BYTE *out)
135{
136PDWORD dwPtrA = (PDWORD) a;
137PDWORD dwPtrB = (PDWORD) b;
138PDWORD dwPtrOut =(PDWORD) out;
139
140    (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
141}
142
143void AddRoundKey(BYTE *key, int round)
144{
145BYTE sbox_key[4];
146BYTE 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
161void SubBytes(BYTE *in, BYTE *out)
162{
163int i;
164
165    for (i=0; i< 16; i++)
166    {
167        out[i] = sbox_table[in[i]];
168    }
169}
170
171void 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
191void 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
201void AESv128(BYTE *key, BYTE *data, BYTE *ciphertext)
202{
203int  i;
204int  round;
205BYTE TmpdataA[16];
206BYTE TmpdataB[16];
207BYTE 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 */
254BOOL AESbGenCCMP(PBYTE pbyRxKey, PBYTE pbyFrame, WORD wFrameSize)
255{
256BYTE            abyNonce[13];
257BYTE            MIC_IV[16];
258BYTE            MIC_HDR1[16];
259BYTE            MIC_HDR2[16];
260BYTE            abyMIC[16];
261BYTE            abyCTRPLD[16];
262BYTE            abyTmp[16];
263BYTE            abyPlainText[16];
264BYTE            abyLastCipher[16];
265
266PS802_11Header  pMACHeader = (PS802_11Header) pbyFrame;
267PBYTE           pbyIV;
268PBYTE           pbyPayload;
269WORD            wHLen = 22;
270WORD            wPayloadSize = wFrameSize - 8 - 8 - 4 - WLAN_HDR_ADDR3_LEN;//8 is IV, 8 is MIC, 4 is CRC
271BOOL            bA4 = FALSE;
272BYTE            byTmp;
273WORD            wCnt;
274int             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}
411