/* | |

* 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" | |

/*--------------------- 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. */ | |

const BYTE 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 BYTE 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]; | |

/*--------------------- Static Functions --------------------------*/ | |

unsigned int tkip_sbox(unsigned int index); | |

unsigned int rotr1(unsigned int a); | |

/*--------------------- Export Variables --------------------------*/ | |

/************************************************************/ | |

/* tkip_sbox() */ | |

/* Returns a 16 bit value from a 64K entry table. The Table */ | |

/* is synthesized from two 256 entry byte wide tables. */ | |

/************************************************************/ | |

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); | |

}; | |

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: Caculate RC4Key fom TK, TA, and TSC | |

* | |

* Parameters: | |

* In: | |

* pbyTKey - TKey | |

* pbyTA - TA | |

* dwTSC - TSC | |

* Out: | |

* pbyRC4Key - RC4Key | |

* | |

* Return Value: none | |

* | |

*/ | |

VOID TKIPvMixKey( | |

PBYTE pbyTKey, | |

PBYTE pbyTA, | |

WORD wTSC15_0, | |

DWORD dwTSC47_16, | |

PBYTE pbyRC4Key | |

) | |

{ | |

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; | |

} |