📄 zdtkipseed.c
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#include "zd80211.h"
#if!defined(AMAC)
/* 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. */
unsigned int 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};
unsigned int 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};
unsigned int tkip_sbox(unsigned int index)
/************************************************************/
/* 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 index_low;
unsigned int index_high;
unsigned int left, right;
index_low = (index & 0xFF);
index_high = ((index >> 8) & 0xFF);
left = Tkip_Sbox_Lower[index_low] + (Tkip_Sbox_Upper[index_low] << 8);
right = Tkip_Sbox_Upper[index_high] + (Tkip_Sbox_Lower[index_high] << 8);
return (left ^ right);
}
unsigned int rotr1(unsigned int a)
// rotate right by 1 bit.
{
unsigned int b;
if (a & 0x01){
b = (a >> 1) | 0x8000;
}
else{
b = (a >> 1) & 0x7fff;
}
return b;
}
/***********************************************************************/
/* */
/* FUNCTION DESCRIPTION Tkip_clear */
/* */
/* clear all variable used in tkip seed generation function */
/* */
/* AUTHOR */
/* Liam,Hwu ZyDAS Technology Corporation */
/* */
/***********************************************************************/
void Tkip_clear(Seedvar *Seed)
{
memset(Seed, 0, sizeof(Seedvar));
// Seed->IV16=1; // According to WPA std Ver2.0 8.3.2.4.4, TSC should be
// initialized to one.
return;
}
/***********************************************************************/
/* */
/* FUNCTION DESCRIPTION Tkip_setkey */
/* */
/* Set Temporal key(TK) and Transmitter Address(TA) */
/* */
/* AUTHOR */
/* Liam,Hwu ZyDAS Technology Corporation */
/* */
/***********************************************************************/
void Tkip_setkey(U8 * key, U8 *ta, Seedvar *Seed)
{
memcpy(Seed->TA, ta, 6);
memcpy(Seed->TK, key, 16);
}
/***********************************************************************/
/* */
/* FUNCTION DESCRIPTION Tkip_Init */
/* */
/* TKIP seed generation function initialization routine */
/* */
/* AUTHOR */
/* Liam,Hwu ZyDAS Technology Corporation */
/* */
/***********************************************************************/
void Tkip_Init(U8 *key, U8 *ta, Seedvar *Seed, U8 *initiv)
{
U16 iv16;
U32 iv32;
int i;
Tkip_clear(Seed);
Tkip_setkey(key, ta, Seed);
iv16 = *initiv++;
iv16 += *initiv << 8;
initiv++;
iv32 = 0;
for (i=0; i<4; i++){ // initiv is little endian
iv32 += *initiv << (i*8);
*initiv++;
}
Seed->IV32 = iv32+1; // Force Recaculating on Tkip Phase1
Tkip_phase1_key_mix(iv32, Seed);
Seed->IV16 = iv16;
Seed->IV32 = iv32;
}
/***********************************************************************/
/* */
/* FUNCTION DESCRIPTION Tkip_phase1_key_mix */
/* */
/* TKIP seed generation function for phase1 key mixing */
/* */
/* AUTHOR */
/* Liam,Hwu ZyDAS Technology Corporation */
/* Return value: */
/* Return TRUE if expected IV sequence is correct. */
/* */
/***********************************************************************/
char Tkip_phase1_key_mix(U32 iv32, Seedvar *Seed)
{
unsigned short tsc0;
unsigned short tsc1;
int i, j;
if (iv32 == Seed->IV32) //don't need to proceed this function the same
return 1;
else {
tsc0 = (unsigned short)((iv32 >> 16) & 0xffff); /* msb */
tsc1 = (unsigned short)(iv32 & 0xffff);
/* Phase 1, step 1 */
Seed->TTAK[0] = tsc1;
Seed->TTAK[1] = tsc0;
Seed->TTAK[2] = (unsigned short)(Seed->TA[0] + (Seed->TA[1] <<8));
Seed->TTAK[3] = (unsigned short)(Seed->TA[2] + (Seed->TA[3] <<8));
Seed->TTAK[4] = (unsigned short)(Seed->TA[4] + (Seed->TA[5] <<8));
/* Phase 1, step 2 */
for (i=0; i<8; i++){
j = 2*(i & 1);
Seed->TTAK[0] = (Seed->TTAK[0] + tkip_sbox(Seed->TTAK[4]
^ Mk16(Seed->TK[1+j],Seed->TK[j]))) & 0xffff;
Seed->TTAK[1] = (Seed->TTAK[1] + tkip_sbox(Seed->TTAK[0]
^ Mk16(Seed->TK[5+j],Seed->TK[4+j] ))) & 0xffff;
Seed->TTAK[2] = (Seed->TTAK[2] + tkip_sbox(Seed->TTAK[1]
^ Mk16(Seed->TK[9+j],Seed->TK[8+j] ))) & 0xffff;
Seed->TTAK[3] = (Seed->TTAK[3] + tkip_sbox(Seed->TTAK[2]
^ Mk16(Seed->TK[13+j],Seed->TK[12+j])))& 0xffff;
Seed->TTAK[4] = (Seed->TTAK[4] + tkip_sbox(Seed->TTAK[3]
^ Mk16(Seed->TK[1+j] ,Seed->TK[j] ))) & 0xffff;
Seed->TTAK[4] = (Seed->TTAK[4] + i) & 0xffff;
}
if (iv32 == (Seed->IV32+1)){
Seed->iv32tmp = iv32;
return 1;
}
else
return 0;
}
}
/***********************************************************************/
/* */
/* FUNCTION DESCRIPTION Tkip_phase2_key_mix */
/* */
/* TKIP seed generation function for phase2 key mixing */
/* */
/* AUTHOR */
/* Liam,Hwu ZyDAS Technology Corporation */
/* Return value: */
/* Return TRUE if expected IV sequence is correct. */
/* */
/***********************************************************************/
char Tkip_phase2_key_mix(U16 iv16, Seedvar *Seed)
{
unsigned int tsc2;
tsc2 = iv16;
/* Phase 2, Step 1 */
Seed->ppk[0] = Seed->TTAK[0];
Seed->ppk[1] = Seed->TTAK[1];
Seed->ppk[2] = Seed->TTAK[2];
Seed->ppk[3] = Seed->TTAK[3];
Seed->ppk[4] = Seed->TTAK[4];
Seed->ppk[5] = (Seed->TTAK[4] + tsc2) & 0xffff;
/* Phase2, Step 2 */
Seed->ppk[0] = Seed->ppk[0] + tkip_sbox(Seed->ppk[5] ^ Mk16(Seed->TK[1],Seed->TK[0])) ;
Seed->ppk[1] = Seed->ppk[1] + tkip_sbox(Seed->ppk[0] ^ Mk16(Seed->TK[3],Seed->TK[2])) ;
Seed->ppk[2] = Seed->ppk[2] + tkip_sbox(Seed->ppk[1] ^ Mk16(Seed->TK[5],Seed->TK[4])) ;
Seed->ppk[3] = Seed->ppk[3] + tkip_sbox(Seed->ppk[2] ^ Mk16(Seed->TK[7],Seed->TK[6])) ;
Seed->ppk[4] = Seed->ppk[4] + tkip_sbox(Seed->ppk[3] ^ Mk16(Seed->TK[9],Seed->TK[8] )) ;
Seed->ppk[5] = Seed->ppk[5] + tkip_sbox(Seed->ppk[4] ^ Mk16(Seed->TK[11],Seed->TK[10])) ;
Seed->ppk[0] = Seed->ppk[0] + rotr1(Seed->ppk[5] ^ Mk16(Seed->TK[13],Seed->TK[12]));
Seed->ppk[1] = Seed->ppk[1] + rotr1(Seed->ppk[0] ^ Mk16(Seed->TK[15],Seed->TK[14]));
Seed->ppk[2] = Seed->ppk[2] + rotr1(Seed->ppk[1]);
Seed->ppk[3] = Seed->ppk[3] + rotr1(Seed->ppk[2]);
Seed->ppk[4] = Seed->ppk[4] + rotr1(Seed->ppk[3]);
Seed->ppk[5] = Seed->ppk[5] + rotr1(Seed->ppk[4]);
if (iv16 == 0){
if (Seed->IV16 == 0xffff){
Seed->iv16tmp = 0;
return 1;
}
else
return 0;
}
else if (iv16 == (Seed->IV16+1)){
Seed->iv16tmp = iv16;
return 1;
}
else
return 0;
}
/***********************************************************************/
/* */
/* FUNCTION DESCRIPTION Tkip_getseeds */
/* */
/* Get RC4Key seeds generated by TKIP */
/* */
/* AUTHOR */
/* Liam,Hwu ZyDAS Technology Corporation */
/* */
/***********************************************************************/
void Tkip_getseeds(U16 iv16, U8 *RC4Key, Seedvar *Seed)
{
RC4Key[0] = Hi8(iv16);
RC4Key[1] = (Hi8(iv16) | 0x20) & 0x7f;
RC4Key[2] = Lo8(iv16);
RC4Key[3] = ((Seed->ppk[5] ^ Mk16(Seed->TK[1],Seed->TK[0]))>>1) & 0xff;
RC4Key[4] = Seed->ppk[0] & 0xff;
RC4Key[5] = Seed->ppk[0] >> 8 ;
RC4Key[6] = Seed->ppk[1] & 0xff;
RC4Key[7] = Seed->ppk[1] >> 8 ;
RC4Key[8] = Seed->ppk[2] & 0xff;
RC4Key[9] = Seed->ppk[2] >> 8 ;
RC4Key[10] = Seed->ppk[3] & 0xff;
RC4Key[11] = Seed->ppk[3] >> 8 ;
RC4Key[12] = Seed->ppk[4] & 0xff;
RC4Key[13] = Seed->ppk[4] >> 8 ;
RC4Key[14] = Seed->ppk[5] & 0xff;
RC4Key[15] = Seed->ppk[5] >> 8 ;
}
/***********************************************************************/
/* */
/* FUNCTION DESCRIPTION Tkip_updateiv */
/* */
/* update stored iv value */
/* */
/* AUTHOR */
/* Liam,Hwu ZyDAS Technology Corporation */
/* */
/***********************************************************************/
void Tkip_updateiv(Seedvar *Seed)
{
Seed->IV16 = Seed->iv16tmp;
Seed->IV32 = Seed->iv32tmp;
}
#endif
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