drivers/staging/vt6656/aes_ccmp.c

   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  * 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  *
  30  * Revision History:
  31  */
  32
  33 #include "device.h"
  34 #include "80211hdr.h"
  35
  36 /*
  37  * SBOX Table
  38  */
  39
  40 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
  57 };
  58
  59 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
  76 };
  77
  78 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
  95 };
  96
  97 static void xor_128(u8 *a, u8 *b, u8 *out)
  98 {
  99         u32 * dwPtrA = (u32 *) a;
 100         u32 * dwPtrB = (u32 *) b;
 101         u32 * dwPtrOut = (u32 *) out;
 102
 103         (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
 104         (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
 105         (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
 106         (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
 107 }
 108
 109 static void xor_32(u8 *a, u8 *b, u8 *out)
 110 {
 111         u32 * dwPtrA = (u32 *) a;
 112         u32 * dwPtrB = (u32 *) b;
 113         u32 * dwPtrOut = (u32 *) out;
 114
 115         (*dwPtrOut++) = (*dwPtrA++) ^ (*dwPtrB++);
 116 }
 117
 118 void AddRoundKey(u8 *key, int round)
 119 {
 120         u8 sbox_key[4];
 121         u8 rcon_table[10] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};
 122
 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]];
 127
 128         key[0] = key[0] ^ rcon_table[round];
 129         xor_32(&key[0], sbox_key, &key[0]);
 130
 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]);
 134 }
 135
 136 void SubBytes(u8 *in, u8 *out)
 137 {
 138         int i;
 139
 140         for (i = 0; i < 16; i++)
 141                 out[i] = sbox_table[in[i]];
 142 }
 143
 144 void ShiftRows(u8 *in, u8 *out)
 145 {
 146         out[0]  = in[0];
 147         out[1]  = in[5];
 148         out[2]  = in[10];
 149         out[3]  = in[15];
 150         out[4]  = in[4];
 151         out[5]  = in[9];
 152         out[6]  = in[14];
 153         out[7]  = in[3];
 154         out[8]  = in[8];
 155         out[9]  = in[13];
 156         out[10] = in[2];
 157         out[11] = in[7];
 158         out[12] = in[12];
 159         out[13] = in[1];
 160         out[14] = in[6];
 161         out[15] = in[11];
 162 }
 163
 164 void MixColumns(u8 *in, u8 *out)
 165 {
 166
 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]];
 171 }
 172
 173 void AESv128(u8 *key, u8 *data, u8 *ciphertext)
 174 {
 175         int  i;
 176         int  round;
 177         u8 TmpdataA[16];
 178         u8 TmpdataB[16];
 179         u8 abyRoundKey[16];
 180
 181         for (i = 0; i < 16; i++)
 182                 abyRoundKey[i] = key[i];
 183
 184         for (round = 0; round < 11; round++) {
 185                 if (round == 0) {
 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);
 201                 }
 202         }
 203
 204 }
 205
 206 /*
 207  * Description: AES decryption
 208  *
 209  * Parameters:
 210  *  In:
 211  *      pbyRxKey            - The key used to decrypt
 212  *      pbyFrame            - Starting address of packet header
 213  *      wFrameSize          - Total packet size including CRC
 214  *  Out:
 215  *      none
 216  *
 217  * Return Value: MIC compare result
 218  *
 219  */
 220
 221 bool AESbGenCCMP(u8 * pbyRxKey, u8 * pbyFrame, u16 wFrameSize)
 222 {
 223         u8            abyNonce[13];
 224         u8            MIC_IV[16];
 225         u8            MIC_HDR1[16];
 226         u8            MIC_HDR2[16];
 227         u8            abyMIC[16];
 228         u8            abyCTRPLD[16];
 229         u8            abyTmp[16];
 230         u8            abyPlainText[16];
 231         u8            abyLastCipher[16];
 232
 233         struct ieee80211_hdr *pMACHeader = (struct ieee80211_hdr *) pbyFrame;
 234         u8 *           pbyIV;
 235         u8 *           pbyPayload;
 236         u16            wHLen = 22;
 237         /* 8 is IV, 8 is MIC, 4 is CRC */
 238         u16            wPayloadSize = wFrameSize - 8 - 8 - 4 - WLAN_HDR_ADDR3_LEN;
 239         bool            bA4 = false;
 240         u8            byTmp;
 241         u16            wCnt;
 242         int             ii, jj, kk;
 243
 244         pbyIV = pbyFrame + WLAN_HDR_ADDR3_LEN;
 245         if (WLAN_GET_FC_TODS(*(u16 *) pbyFrame) &&
 246             WLAN_GET_FC_FROMDS(*(u16 *) pbyFrame)) {
 247                 bA4 = true;
 248                 pbyIV += 6;             /* 6 is 802.11 address4 */
 249                 wHLen += 6;
 250                 wPayloadSize -= 6;
 251         }
 252         pbyPayload = pbyIV + 8; /* IV-length */
 253
 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];
 262
 263         /* MIC_IV */
 264         MIC_IV[0] = 0x59;
 265         memcpy(&(MIC_IV[1]), &(abyNonce[0]), 13);
 266         MIC_IV[14] = (u8)(wPayloadSize >> 8);
 267         MIC_IV[15] = (u8)(wPayloadSize & 0xff);
 268
 269         /* MIC_HDR1 */
 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);
 275         byTmp &= 0x87;
 276         MIC_HDR1[3] = byTmp | 0x40;
 277         memcpy(&(MIC_HDR1[4]), pMACHeader->addr1, ETH_ALEN);
 278         memcpy(&(MIC_HDR1[10]), pMACHeader->addr2, ETH_ALEN);
 279
 280         /* MIC_HDR2 */
 281         memcpy(&(MIC_HDR2[0]), pMACHeader->addr3, ETH_ALEN);
 282         byTmp = (u8)(pMACHeader->seq_ctrl & 0xff);
 283         MIC_HDR2[6] = byTmp & 0x0f;
 284         MIC_HDR2[7] = 0;
 285
 286         if (bA4) {
 287                 memcpy(&(MIC_HDR2[8]), pMACHeader->addr4, ETH_ALEN);
 288         } else {
 289                 MIC_HDR2[8]  = 0x00;
 290                 MIC_HDR2[9]  = 0x00;
 291                 MIC_HDR2[10] = 0x00;
 292                 MIC_HDR2[11] = 0x00;
 293                 MIC_HDR2[12] = 0x00;
 294                 MIC_HDR2[13] = 0x00;
 295         }
 296         MIC_HDR2[14] = 0x00;
 297         MIC_HDR2[15] = 0x00;
 298
 299         /* CCMP */
 300         AESv128(pbyRxKey, MIC_IV, abyMIC);
 301         for (kk = 0; kk < 16; kk++)
 302                 abyTmp[kk] = MIC_HDR1[kk] ^ abyMIC[kk];
 303
 304         AESv128(pbyRxKey, abyTmp, abyMIC);
 305         for (kk = 0; kk < 16; kk++)
 306                 abyTmp[kk] = MIC_HDR2[kk] ^ abyMIC[kk];
 307
 308         AESv128(pbyRxKey, abyTmp, abyMIC);
 309
 310         wCnt = 1;
 311         abyCTRPLD[0] = 0x01;
 312         memcpy(&(abyCTRPLD[1]), &(abyNonce[0]), 13);
 313
 314         for (jj = wPayloadSize; jj > 16; jj = jj-16) {
 315
 316                 abyCTRPLD[14] = (u8) (wCnt >> 8);
 317                 abyCTRPLD[15] = (u8) (wCnt & 0xff);
 318
 319                 AESv128(pbyRxKey, abyCTRPLD, abyTmp);
 320
 321                 for (kk = 0; kk < 16; kk++)
 322                         abyPlainText[kk] = abyTmp[kk] ^ pbyPayload[kk];
 323
 324                 for (kk = 0; kk < 16; kk++)
 325                         abyTmp[kk] = abyMIC[kk] ^ abyPlainText[kk];
 326
 327                 AESv128(pbyRxKey, abyTmp, abyMIC);
 328
 329                 memcpy(pbyPayload, abyPlainText, 16);
 330                 wCnt++;
 331                 pbyPayload += 16;
 332         } /* for wPayloadSize */
 333
 334         /* last payload */
 335         memcpy(&(abyLastCipher[0]), pbyPayload, jj);
 336         for (ii = jj; ii < 16; ii++)
 337                 abyLastCipher[ii] = 0x00;
 338
 339         abyCTRPLD[14] = (u8) (wCnt >> 8);
 340         abyCTRPLD[15] = (u8) (wCnt & 0xff);
 341
 342         AESv128(pbyRxKey, abyCTRPLD, abyTmp);
 343         for (kk = 0; kk < 16; kk++)
 344                 abyPlainText[kk] = abyTmp[kk] ^ abyLastCipher[kk];
 345
 346         memcpy(pbyPayload, abyPlainText, jj);
 347         pbyPayload += jj;
 348
 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];
 354
 355         AESv128(pbyRxKey, abyTmp, abyMIC);
 356
 357         /* => above is the calculated MIC */
 358
 359         wCnt = 0;
 360         abyCTRPLD[14] = (u8) (wCnt >> 8);
 361         abyCTRPLD[15] = (u8) (wCnt & 0xff);
 362         AESv128(pbyRxKey, abyCTRPLD, abyTmp);
 363
 364         for (kk = 0; kk < 8; kk++)
 365                 abyTmp[kk] = abyTmp[kk] ^ pbyPayload[kk];
 366
 367         /* => above is the packet dec-MIC */
 368
 369         if (!memcmp(abyMIC, abyTmp, 8))
 370                 return true;
 371         else
 372                 return false;
 373 }