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drivers/staging/vt6655/tkip.c
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/* * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc. * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * * File: tkip.c * * Purpose: Implement functions for 802.11i TKIP * * Author: Jerry Chen * * Date: Mar. 11, 2003 * * Functions: * TKIPvMixKey - Get TKIP RC4 Key from TK,TA, and TSC * * Revision History: * */ |
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#include "tmacro.h" |
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#include "tkip.h" |
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/*--------------------- Static Definitions -------------------------*/ /*--------------------- Static Classes ----------------------------*/ /*--------------------- Static Variables --------------------------*/ /*--------------------- Static Functions --------------------------*/ /*--------------------- Export Variables --------------------------*/ /*--------------------- Static Definitions -------------------------*/ /*--------------------- Static Classes ----------------------------*/ /*--------------------- Static Variables --------------------------*/ /* The Sbox is reduced to 2 16-bit wide tables, each with 256 entries. */ /* The 2nd table is the same as the 1st but with the upper and lower */ /* bytes swapped. To allow an endian tolerant implementation, the byte */ /* halves have been expressed independently here. */ |
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const unsigned char TKIP_Sbox_Lower[256] = { |
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const unsigned char TKIP_Sbox_Upper[256] = { |
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void TKIPvMixKey( |
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unsigned char *pbyTKey, unsigned char *pbyTA, |
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unsigned short wTSC15_0, |
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unsigned long dwTSC47_16, |
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unsigned char *pbyRC4Key |
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) { unsigned int p1k[5]; // unsigned int ttak0, ttak1, ttak2, ttak3, ttak4; unsigned int tsc0, tsc1, tsc2; unsigned int ppk0, ppk1, ppk2, ppk3, ppk4, ppk5; unsigned long int pnl,pnh; int i, j; pnl = wTSC15_0; pnh = dwTSC47_16; tsc0 = (unsigned int)((pnh >> 16) % 65536); /* msb */ tsc1 = (unsigned int)(pnh % 65536); tsc2 = (unsigned int)(pnl % 65536); /* lsb */ /* Phase 1, step 1 */ p1k[0] = tsc1; p1k[1] = tsc0; p1k[2] = (unsigned int)(pbyTA[0] + (pbyTA[1]*256)); p1k[3] = (unsigned int)(pbyTA[2] + (pbyTA[3]*256)); p1k[4] = (unsigned int)(pbyTA[4] + (pbyTA[5]*256)); /* Phase 1, step 2 */ for (i=0; i<8; i++) { j = 2*(i & 1); p1k[0] = (p1k[0] + tkip_sbox( (p1k[4] ^ ((256*pbyTKey[1+j]) + pbyTKey[j])) % 65536 )) % 65536; p1k[1] = (p1k[1] + tkip_sbox( (p1k[0] ^ ((256*pbyTKey[5+j]) + pbyTKey[4+j])) % 65536 )) % 65536; p1k[2] = (p1k[2] + tkip_sbox( (p1k[1] ^ ((256*pbyTKey[9+j]) + pbyTKey[8+j])) % 65536 )) % 65536; p1k[3] = (p1k[3] + tkip_sbox( (p1k[2] ^ ((256*pbyTKey[13+j]) + pbyTKey[12+j])) % 65536 )) % 65536; p1k[4] = (p1k[4] + tkip_sbox( (p1k[3] ^ (((256*pbyTKey[1+j]) + pbyTKey[j]))) % 65536 )) % 65536; p1k[4] = (p1k[4] + i) % 65536; } /* Phase 2, Step 1 */ ppk0 = p1k[0]; ppk1 = p1k[1]; ppk2 = p1k[2]; ppk3 = p1k[3]; ppk4 = p1k[4]; ppk5 = (p1k[4] + tsc2) % 65536; /* Phase2, Step 2 */ ppk0 = ppk0 + tkip_sbox( (ppk5 ^ ((256*pbyTKey[1]) + pbyTKey[0])) % 65536); ppk1 = ppk1 + tkip_sbox( (ppk0 ^ ((256*pbyTKey[3]) + pbyTKey[2])) % 65536); ppk2 = ppk2 + tkip_sbox( (ppk1 ^ ((256*pbyTKey[5]) + pbyTKey[4])) % 65536); ppk3 = ppk3 + tkip_sbox( (ppk2 ^ ((256*pbyTKey[7]) + pbyTKey[6])) % 65536); ppk4 = ppk4 + tkip_sbox( (ppk3 ^ ((256*pbyTKey[9]) + pbyTKey[8])) % 65536); ppk5 = ppk5 + tkip_sbox( (ppk4 ^ ((256*pbyTKey[11]) + pbyTKey[10])) % 65536); ppk0 = ppk0 + rotr1(ppk5 ^ ((256*pbyTKey[13]) + pbyTKey[12])); ppk1 = ppk1 + rotr1(ppk0 ^ ((256*pbyTKey[15]) + pbyTKey[14])); ppk2 = ppk2 + rotr1(ppk1); ppk3 = ppk3 + rotr1(ppk2); ppk4 = ppk4 + rotr1(ppk3); ppk5 = ppk5 + rotr1(ppk4); /* Phase 2, Step 3 */ pbyRC4Key[0] = (tsc2 >> 8) % 256; pbyRC4Key[1] = (((tsc2 >> 8) % 256) | 0x20) & 0x7f; pbyRC4Key[2] = tsc2 % 256; pbyRC4Key[3] = ((ppk5 ^ ((256*pbyTKey[1]) + pbyTKey[0])) >> 1) % 256; pbyRC4Key[4] = ppk0 % 256; pbyRC4Key[5] = (ppk0 >> 8) % 256; pbyRC4Key[6] = ppk1 % 256; pbyRC4Key[7] = (ppk1 >> 8) % 256; pbyRC4Key[8] = ppk2 % 256; pbyRC4Key[9] = (ppk2 >> 8) % 256; pbyRC4Key[10] = ppk3 % 256; pbyRC4Key[11] = (ppk3 >> 8) % 256; pbyRC4Key[12] = ppk4 % 256; pbyRC4Key[13] = (ppk4 >> 8) % 256; pbyRC4Key[14] = ppk5 % 256; pbyRC4Key[15] = (ppk5 >> 8) % 256; } |