| /* |
| * 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: |
| * |
| */ |
| |
| #include "tmacro.h" |
| #include "tkip.h" |
| |
| /* 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. */ |
| const u8 TKIP_Sbox_Lower[256] = { |
| 0xA5,0x84,0x99,0x8D,0x0D,0xBD,0xB1,0x54, |
| 0x50,0x03,0xA9,0x7D,0x19,0x62,0xE6,0x9A, |
| 0x45,0x9D,0x40,0x87,0x15,0xEB,0xC9,0x0B, |
| 0xEC,0x67,0xFD,0xEA,0xBF,0xF7,0x96,0x5B, |
| 0xC2,0x1C,0xAE,0x6A,0x5A,0x41,0x02,0x4F, |
| 0x5C,0xF4,0x34,0x08,0x93,0x73,0x53,0x3F, |
| 0x0C,0x52,0x65,0x5E,0x28,0xA1,0x0F,0xB5, |
| 0x09,0x36,0x9B,0x3D,0x26,0x69,0xCD,0x9F, |
| 0x1B,0x9E,0x74,0x2E,0x2D,0xB2,0xEE,0xFB, |
| 0xF6,0x4D,0x61,0xCE,0x7B,0x3E,0x71,0x97, |
| 0xF5,0x68,0x00,0x2C,0x60,0x1F,0xC8,0xED, |
| 0xBE,0x46,0xD9,0x4B,0xDE,0xD4,0xE8,0x4A, |
| 0x6B,0x2A,0xE5,0x16,0xC5,0xD7,0x55,0x94, |
| 0xCF,0x10,0x06,0x81,0xF0,0x44,0xBA,0xE3, |
| 0xF3,0xFE,0xC0,0x8A,0xAD,0xBC,0x48,0x04, |
| 0xDF,0xC1,0x75,0x63,0x30,0x1A,0x0E,0x6D, |
| 0x4C,0x14,0x35,0x2F,0xE1,0xA2,0xCC,0x39, |
| 0x57,0xF2,0x82,0x47,0xAC,0xE7,0x2B,0x95, |
| 0xA0,0x98,0xD1,0x7F,0x66,0x7E,0xAB,0x83, |
| 0xCA,0x29,0xD3,0x3C,0x79,0xE2,0x1D,0x76, |
| 0x3B,0x56,0x4E,0x1E,0xDB,0x0A,0x6C,0xE4, |
| 0x5D,0x6E,0xEF,0xA6,0xA8,0xA4,0x37,0x8B, |
| 0x32,0x43,0x59,0xB7,0x8C,0x64,0xD2,0xE0, |
| 0xB4,0xFA,0x07,0x25,0xAF,0x8E,0xE9,0x18, |
| 0xD5,0x88,0x6F,0x72,0x24,0xF1,0xC7,0x51, |
| 0x23,0x7C,0x9C,0x21,0xDD,0xDC,0x86,0x85, |
| 0x90,0x42,0xC4,0xAA,0xD8,0x05,0x01,0x12, |
| 0xA3,0x5F,0xF9,0xD0,0x91,0x58,0x27,0xB9, |
| 0x38,0x13,0xB3,0x33,0xBB,0x70,0x89,0xA7, |
| 0xB6,0x22,0x92,0x20,0x49,0xFF,0x78,0x7A, |
| 0x8F,0xF8,0x80,0x17,0xDA,0x31,0xC6,0xB8, |
| 0xC3,0xB0,0x77,0x11,0xCB,0xFC,0xD6,0x3A |
| }; |
| |
| const u8 TKIP_Sbox_Upper[256] = { |
| 0xC6,0xF8,0xEE,0xF6,0xFF,0xD6,0xDE,0x91, |
| 0x60,0x02,0xCE,0x56,0xE7,0xB5,0x4D,0xEC, |
| 0x8F,0x1F,0x89,0xFA,0xEF,0xB2,0x8E,0xFB, |
| 0x41,0xB3,0x5F,0x45,0x23,0x53,0xE4,0x9B, |
| 0x75,0xE1,0x3D,0x4C,0x6C,0x7E,0xF5,0x83, |
| 0x68,0x51,0xD1,0xF9,0xE2,0xAB,0x62,0x2A, |
| 0x08,0x95,0x46,0x9D,0x30,0x37,0x0A,0x2F, |
| 0x0E,0x24,0x1B,0xDF,0xCD,0x4E,0x7F,0xEA, |
| 0x12,0x1D,0x58,0x34,0x36,0xDC,0xB4,0x5B, |
| 0xA4,0x76,0xB7,0x7D,0x52,0xDD,0x5E,0x13, |
| 0xA6,0xB9,0x00,0xC1,0x40,0xE3,0x79,0xB6, |
| 0xD4,0x8D,0x67,0x72,0x94,0x98,0xB0,0x85, |
| 0xBB,0xC5,0x4F,0xED,0x86,0x9A,0x66,0x11, |
| 0x8A,0xE9,0x04,0xFE,0xA0,0x78,0x25,0x4B, |
| 0xA2,0x5D,0x80,0x05,0x3F,0x21,0x70,0xF1, |
| 0x63,0x77,0xAF,0x42,0x20,0xE5,0xFD,0xBF, |
| 0x81,0x18,0x26,0xC3,0xBE,0x35,0x88,0x2E, |
| 0x93,0x55,0xFC,0x7A,0xC8,0xBA,0x32,0xE6, |
| 0xC0,0x19,0x9E,0xA3,0x44,0x54,0x3B,0x0B, |
| 0x8C,0xC7,0x6B,0x28,0xA7,0xBC,0x16,0xAD, |
| 0xDB,0x64,0x74,0x14,0x92,0x0C,0x48,0xB8, |
| 0x9F,0xBD,0x43,0xC4,0x39,0x31,0xD3,0xF2, |
| 0xD5,0x8B,0x6E,0xDA,0x01,0xB1,0x9C,0x49, |
| 0xD8,0xAC,0xF3,0xCF,0xCA,0xF4,0x47,0x10, |
| 0x6F,0xF0,0x4A,0x5C,0x38,0x57,0x73,0x97, |
| 0xCB,0xA1,0xE8,0x3E,0x96,0x61,0x0D,0x0F, |
| 0xE0,0x7C,0x71,0xCC,0x90,0x06,0xF7,0x1C, |
| 0xC2,0x6A,0xAE,0x69,0x17,0x99,0x3A,0x27, |
| 0xD9,0xEB,0x2B,0x22,0xD2,0xA9,0x07,0x33, |
| 0x2D,0x3C,0x15,0xC9,0x87,0xAA,0x50,0xA5, |
| 0x03,0x59,0x09,0x1A,0x65,0xD7,0x84,0xD0, |
| 0x82,0x29,0x5A,0x1E,0x7B,0xA8,0x6D,0x2C |
| }; |
| |
| //STKIPKeyManagement sTKIPKeyTable[MAX_TKIP_KEY]; |
| |
| /************************************************************/ |
| /* tkip_sbox() */ |
| /* Returns a 16 bit value from a 64K entry table. The Table */ |
| /* is synthesized from two 256 entry byte wide tables. */ |
| /************************************************************/ |
| static unsigned int tkip_sbox(unsigned int index) |
| { |
| unsigned int index_low; |
| unsigned int index_high; |
| unsigned int left, right; |
| |
| index_low = (index % 256); |
| index_high = ((index >> 8) % 256); |
| |
| left = TKIP_Sbox_Lower[index_low] + (TKIP_Sbox_Upper[index_low] * 256); |
| right = TKIP_Sbox_Upper[index_high] + (TKIP_Sbox_Lower[index_high] * 256); |
| |
| return (left ^ right); |
| }; |
| |
| static unsigned int rotr1(unsigned int a) |
| { |
| unsigned int b; |
| |
| if ((a & 0x01) == 0x01) { |
| b = (a >> 1) | 0x8000; |
| } else { |
| b = (a >> 1) & 0x7fff; |
| } |
| b = b % 65536; |
| return b; |
| } |
| |
| /* |
| * Description: Calculate RC4Key fom TK, TA, and TSC |
| * |
| * Parameters: |
| * In: |
| * pbyTKey - TKey |
| * pbyTA - TA |
| * dwTSC - TSC |
| * Out: |
| * pbyRC4Key - RC4Key |
| * |
| * Return Value: none |
| * |
| */ |
| void TKIPvMixKey( |
| u8 * pbyTKey, |
| u8 * pbyTA, |
| u16 wTSC15_0, |
| u32 dwTSC47_16, |
| u8 * pbyRC4Key |
| ) |
| { |
| u32 p1k[5]; |
| u32 tsc0, tsc1, tsc2; |
| u32 ppk0, ppk1, ppk2, ppk3, ppk4, ppk5; |
| u32 pnl, pnh; |
| int i, j; |
| |
| pnl = (u32)wTSC15_0; |
| pnh = (u32)(dwTSC47_16 & 0xffffffff); |
| |
| tsc0 = (u32)((pnh >> 16) % 65536); /* msb */ |
| tsc1 = (u32)(pnh % 65536); |
| tsc2 = (u32)(pnl % 65536); /* lsb */ |
| |
| /* Phase 1, step 1 */ |
| p1k[0] = tsc1; |
| p1k[1] = tsc0; |
| p1k[2] = (u32)(pbyTA[0] + (pbyTA[1]*256)); |
| p1k[3] = (u32)(pbyTA[2] + (pbyTA[3]*256)); |
| p1k[4] = (u32)(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; |
| } |
