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crypto.c
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/*
* MD5, SHA-1, RC4 and AES implementations
*
* Copyright (C) 2001-2004 Christophe Devine
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#include <string.h>
#include <arpa/inet.h>
#include <assert.h>
#include <pthread.h>
#include <stdint.h>
#include "crypto.h"
#include "crctable.h"
#include "aircrack-ng.h"
#define GET_UINT32_LE(n,b,i) \
{ \
(n) = ( (uint32_t) (b)[(i) ] ) \
| ( (uint32_t) (b)[(i) + 1] << 8 ) \
| ( (uint32_t) (b)[(i) + 2] << 16 ) \
| ( (uint32_t) (b)[(i) + 3] << 24 ); \
}
#define PUT_UINT32_LE(n,b,i) \
{ \
(b)[(i) ] = (uint8_t) ( (n) ); \
(b)[(i) + 1] = (uint8_t) ( (n) >> 8 ); \
(b)[(i) + 2] = (uint8_t) ( (n) >> 16 ); \
(b)[(i) + 3] = (uint8_t) ( (n) >> 24 ); \
}
#define GET_UINT32_BE(n,b,i) \
{ \
(n) = ( (uint32_t) (b)[(i) ] << 24 ) \
| ( (uint32_t) (b)[(i) + 1] << 16 ) \
| ( (uint32_t) (b)[(i) + 2] << 8 ) \
| ( (uint32_t) (b)[(i) + 3] ); \
}
#define PUT_UINT32_BE(n,b,i) \
{ \
(b)[(i) ] = (uint8_t) ( (n) >> 24 ); \
(b)[(i) + 1] = (uint8_t) ( (n) >> 16 ); \
(b)[(i) + 2] = (uint8_t) ( (n) >> 8 ); \
(b)[(i) + 3] = (uint8_t) ( (n) ); \
}
static unsigned char ZERO[32] =
"\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00";
/* RC4 encryption/ WEP decryption check */
/* SSL decryption */
int encrypt_wep( unsigned char *data, int len, unsigned char *key, int keylen )
{
RC4_KEY S;
RC4_set_key( &S, keylen, key );
RC4( &S, len, data, data );
return ( 0 );
}
int decrypt_wep( unsigned char *data, int len, unsigned char *key, int keylen )
{
encrypt_wep (data,len,key,keylen);
return( check_crc_buf( data, len - 4 ) );
}
/* An implementation of the ARC4 algorithm */
void rc4_setup( struct rc4_state *s, unsigned char *key, int length )
{
int i, j, k, *m, a;
s->x = 0;
s->y = 0;
m = s->m;
for( i = 0; i < 256; i++ )
{
m[i] = i;
}
j = k = 0;
for(i=0 ; i < 256; i++ )
{
a = m[i];
j = (unsigned char) ( j + a + key[k] );
m[i] = m[j]; m[j] = a;
if( ++k >= length ) k = 0;
}
}
void rc4_crypt( struct rc4_state *s, unsigned char *data, int length )
{
int i, x, y, *m, a, b;
x = s->x;
y = s->y;
m = s->m;
for( i = 0; i < length; i++ )
{
x = (unsigned char) ( x + 1 ); a = m[x];
y = (unsigned char) ( y + a );
m[x] = b = m[y];
m[y] = a;
data[i] ^= m[(unsigned char) ( a + b )];
}
s->x = x;
s->y = y;
}
/* WEP (barebone RC4) en-/decryption routines */
/*
int encrypt_wep( unsigned char *data, int len, unsigned char *key, int keylen )
{
struct rc4_state S;
rc4_setup( &S, key, keylen );
rc4_crypt( &S, data, len );
return( 0 );
}
int decrypt_wep( unsigned char *data, int len, unsigned char *key, int keylen )
{
struct rc4_state S;
rc4_setup( &S, key, keylen );
rc4_crypt( &S, data, len );
return( check_crc_buf( data, len - 4 ) );
}
*/
/* derive the PMK from the passphrase and the essid */
void calc_pmk( char *key, char *essid_pre, unsigned char pmk[40] )
{
int i, j, slen;
unsigned char buffer[65];
char essid[33+4];
SHA_CTX ctx_ipad;
SHA_CTX ctx_opad;
SHA_CTX sha1_ctx;
memset(essid, 0, sizeof(essid));
memcpy(essid, essid_pre, strlen(essid_pre));
slen = strlen( essid ) + 4;
/* setup the inner and outer contexts */
memset( buffer, 0, sizeof( buffer ) );
strncpy( (char *) buffer, key, sizeof( buffer ) - 1 );
for( i = 0; i < 64; i++ )
buffer[i] ^= 0x36;
SHA1_Init( &ctx_ipad );
SHA1_Update( &ctx_ipad, buffer, 64 );
for( i = 0; i < 64; i++ )
buffer[i] ^= 0x6A;
SHA1_Init( &ctx_opad );
SHA1_Update( &ctx_opad, buffer, 64 );
/* iterate HMAC-SHA1 over itself 8192 times */
essid[slen - 1] = '\1';
HMAC(EVP_sha1(), (unsigned char *)key, strlen(key), (unsigned char*)essid, slen, pmk, NULL);
memcpy( buffer, pmk, 20 );
for( i = 1; i < 4096; i++ )
{
memcpy( &sha1_ctx, &ctx_ipad, sizeof( sha1_ctx ) );
SHA1_Update( &sha1_ctx, buffer, 20 );
SHA1_Final( buffer, &sha1_ctx );
memcpy( &sha1_ctx, &ctx_opad, sizeof( sha1_ctx ) );
SHA1_Update( &sha1_ctx, buffer, 20 );
SHA1_Final( buffer, &sha1_ctx );
for( j = 0; j < 20; j++ )
pmk[j] ^= buffer[j];
}
essid[slen - 1] = '\2';
HMAC(EVP_sha1(), (unsigned char *)key, strlen(key), (unsigned char*)essid, slen, pmk+20, NULL);
memcpy( buffer, pmk + 20, 20 );
for( i = 1; i < 4096; i++ )
{
memcpy( &sha1_ctx, &ctx_ipad, sizeof( sha1_ctx ) );
SHA1_Update( &sha1_ctx, buffer, 20 );
SHA1_Final( buffer, &sha1_ctx );
memcpy( &sha1_ctx, &ctx_opad, sizeof( sha1_ctx ) );
SHA1_Update( &sha1_ctx, buffer, 20 );
SHA1_Final( buffer, &sha1_ctx );
for( j = 0; j < 20; j++ )
pmk[j + 20] ^= buffer[j];
}
}
// void calc_ptk (struct WPA_hdsk *wpa, unsigned char bssid[6], unsigned char pmk[32], unsigned char ptk[80]) {
// int i;
// unsigned char pke[100];
// HMAC_CTX ctx;
//
// memcpy( pke, "Pairwise key expansion", 23 );
//
// if( memcmp( wpa->stmac, bssid, 6 ) < 0 )
// {
// memcpy( pke + 23, wpa->stmac, 6 );
// memcpy( pke + 29, bssid, 6 );
// }
// else
// {
// memcpy( pke + 23, bssid, 6 );
// memcpy( pke + 29, wpa->stmac, 6 );
// }
//
// if( memcmp( wpa->snonce, wpa->anonce, 32 ) < 0 )
// {
// memcpy( pke + 35, wpa->snonce, 32 );
// memcpy( pke + 67, wpa->anonce, 32 );
// }
// else
// {
// memcpy( pke + 35, wpa->anonce, 32 );
// memcpy( pke + 67, wpa->snonce, 32 );
// }
//
// HMAC_CTX_init(&ctx);
// HMAC_Init_ex(&ctx, pmk, 32, EVP_sha1(), NULL);
// for(i = 0; i < 4; i++ )
// {
// pke[99] = i;
// //HMAC(EVP_sha1(), values[0], 32, pke, 100, ptk + i * 20, NULL);
// HMAC_Init_ex(&ctx, 0, 0, 0, 0);
// HMAC_Update(&ctx, pke, 100);
// HMAC_Final(&ctx, ptk + i*20, NULL);
// }
// HMAC_CTX_cleanup(&ctx);
// }
void calc_mic (struct AP_info *ap, unsigned char pmk[32], unsigned char ptk[80], unsigned char mic[20]) {
int i;
unsigned char pke[100];
HMAC_CTX ctx;
memcpy( pke, "Pairwise key expansion", 23 );
if( memcmp( ap->wpa.stmac, ap->bssid, 6 ) < 0 )
{
memcpy( pke + 23, ap->wpa.stmac, 6 );
memcpy( pke + 29, ap->bssid, 6 );
}
else
{
memcpy( pke + 23, ap->bssid, 6 );
memcpy( pke + 29, ap->wpa.stmac, 6 );
}
if( memcmp( ap->wpa.snonce, ap->wpa.anonce, 32 ) < 0 )
{
memcpy( pke + 35, ap->wpa.snonce, 32 );
memcpy( pke + 67, ap->wpa.anonce, 32 );
}
else
{
memcpy( pke + 35, ap->wpa.anonce, 32 );
memcpy( pke + 67, ap->wpa.snonce, 32 );
}
HMAC_CTX_init(&ctx);
HMAC_Init_ex(&ctx, pmk, 32, EVP_sha1(), NULL);
for(i = 0; i < 4; i++ )
{
pke[99] = i;
//HMAC(EVP_sha1(), values[0], 32, pke, 100, ptk + i * 20, NULL);
HMAC_Init_ex(&ctx, 0, 0, 0, 0);
HMAC_Update(&ctx, pke, 100);
HMAC_Final(&ctx, ptk + i*20, NULL);
}
HMAC_CTX_cleanup(&ctx);
if( ap->wpa.keyver == 1 )
{
HMAC(EVP_md5(), ptk, 16, ap->wpa.eapol, ap->wpa.eapol_size, mic, NULL);
}
else
{
HMAC(EVP_sha1(), ptk, 16, ap->wpa.eapol, ap->wpa.eapol_size, mic, NULL);
}
}
unsigned long calc_crc( unsigned char * buf, int len)
{
unsigned long crc = 0xFFFFFFFF;
for( ; len > 0; len--, buf++ )
crc = crc_tbl[(crc ^ *buf) & 0xFF] ^ ( crc >> 8 );
return( ~crc );
}
//without inversion, must be used for bit flipping attacks
unsigned long calc_crc_plain( unsigned char * buf, int len)
{
unsigned long crc = 0x00000000;
for( ; len > 0; len--, buf++ )
crc = crc_tbl[(crc ^ *buf) & 0xFF] ^ ( crc >> 8 );
return( crc );
}
/* CRC checksum verification routine */
int check_crc_buf( unsigned char *buf, int len )
{
unsigned long crc;
crc = calc_crc(buf, len);
buf+=len;
return( ( ( crc ) & 0xFF ) == buf[0] &&
( ( crc >> 8 ) & 0xFF ) == buf[1] &&
( ( crc >> 16 ) & 0xFF ) == buf[2] &&
( ( crc >> 24 ) & 0xFF ) == buf[3] );
}
/* Add CRC32 */
int add_crc32(unsigned char* data, int length)
{
unsigned long crc;
crc = calc_crc(data, length);
data[length] = (crc ) & 0xFF;
data[length+1] = (crc >> 8) & 0xFF;
data[length+2] = (crc >> 16) & 0xFF;
data[length+3] = (crc >> 24) & 0xFF;
return 0;
}
int add_crc32_plain(unsigned char* data, int length)
{
unsigned long crc;
crc = calc_crc_plain(data, length);
data[length] = (crc ) & 0xFF;
data[length+1] = (crc >> 8) & 0xFF;
data[length+2] = (crc >> 16) & 0xFF;
data[length+3] = (crc >> 24) & 0xFF;
return 0;
}
int calc_crc_buf( unsigned char *buf, int len )
{
return (calc_crc(buf, len));
}
void *get_da(unsigned char *wh)
{
if (wh[1] & IEEE80211_FC1_DIR_FROMDS)
return wh + 4;
else
return wh + 4 + 6*2;
}
void *get_sa(unsigned char *wh)
{
if (wh[1] & IEEE80211_FC1_DIR_FROMDS)
return wh + 4 + 6*2;
else
return wh + 4 + 6;
}
int is_ipv6(void *wh)
{
if(memcmp(wh+4, "\x33\x33", 2) == 0 || memcmp(wh+16, "\x33\x33", 2) == 0)
return 1;
return 0;
}
int is_dhcp_discover(void *wh, int len)
{
if( (memcmp(wh+4, BROADCAST, 6) == 0 || memcmp(wh+16, BROADCAST, 6) == 0) && (len >= 360 - 24 - 4 - 4 && len <= 380 - 24 - 4 - 4 ) )
return 1;
return 0;
}
int is_arp(void *wh, int len)
{
int arpsize = 8 + 8 + 10*2;
if(wh) {}
/* remove non BROADCAST frames? could be anything, but
* chances are good that we got an arp response tho. */
if (len == arpsize || len == 54)
return 1;
return 0;
}
int is_wlccp(void *wh, int len)
{
int wlccpsize = 58;
if(wh) {}
if (len == wlccpsize)
return 1;
return 0;
}
int is_qos_arp_tkip(void *wh, int len)
{
unsigned char *packet = (unsigned char*) wh;
int qosarpsize = (24 + 2) + 8 + (8 + (8 + 10*2)) + 8 + 4; //82 in total
if((packet[1] & 3) == 1) //to ds
{
if (len == qosarpsize) //always wireless
return 1;
}
if((packet[1] & 3) == 2) //from ds
{
if (len == qosarpsize || len == qosarpsize + 18) //wireless or padded wired
return 1;
}
return 0;
}
int is_spantree(void *wh)
{
if ( wh != NULL &&
(memcmp( wh + 4, SPANTREE, 6 ) == 0 ||
memcmp( wh + 16, SPANTREE, 6 ) == 0 ))
return 1;
return 0;
}
int is_cdp_vtp(void *wh)
{
if ( memcmp( wh + 4, CDP_VTP, 6 ) == 0 ||
memcmp( wh + 16, CDP_VTP, 6 ) == 0 )
return 1;
return 0;
}
/* weight is used for guesswork in PTW. Can be null if known_clear is not for
* PTW, but just for getting known clear-text.
*/
int known_clear(void *clear, int *clen, int *weight, unsigned char *wh, int len)
{
unsigned char *ptr = clear;
int num;
if(is_arp(wh, len)) /*arp*/
{
len = sizeof(S_LLC_SNAP_ARP) - 1;
memcpy(ptr, S_LLC_SNAP_ARP, len);
ptr += len;
/* arp hdr */
len = 6;
memcpy(ptr, "\x00\x01\x08\x00\x06\x04", len);
ptr += len;
/* type of arp */
len = 2;
if (memcmp(get_da(wh), "\xff\xff\xff\xff\xff\xff", 6) == 0)
memcpy(ptr, "\x00\x01", len);
else
memcpy(ptr, "\x00\x02", len);
ptr += len;
/* src mac */
len = 6;
memcpy(ptr, get_sa(wh), len);
ptr += len;
len = ptr - ((unsigned char*)clear);
*clen = len;
if (weight)
weight[0] = 256;
return 1;
}
else if(is_wlccp(wh, len)) /*wlccp*/
{
len = sizeof(S_LLC_SNAP_WLCCP) - 1;
memcpy(ptr, S_LLC_SNAP_WLCCP, len);
ptr += len;
/* wlccp hdr */
len = 4;
memcpy(ptr, "\x00\x32\x40\x01", len);
ptr += len;
/* dst mac */
len = 6;
memcpy(ptr, get_da(wh), len);
ptr += len;
len = ptr - ((unsigned char*)clear);
*clen = len;
if (weight)
weight[0] = 256;
return 1;
}
else if(is_spantree(wh)) /*spantree*/
{
len = sizeof(S_LLC_SNAP_SPANTREE) - 1;
memcpy(ptr, S_LLC_SNAP_SPANTREE, len);
ptr += len;
len = ptr - ((unsigned char*)clear);
*clen = len;
if (weight)
weight[0] = 256;
return 1;
}
else if(is_cdp_vtp(wh)) /*spantree*/
{
len = sizeof(S_LLC_SNAP_CDP) - 1;
memcpy(ptr, S_LLC_SNAP_CDP, len);
ptr += len;
len = ptr - ((unsigned char*)clear);
*clen = len;
if (weight)
weight[0] = 256;
return 1;
}
else /* IP */
{
unsigned short iplen = htons(len - 8);
// printf("Assuming IP %d\n", len);
len = sizeof(S_LLC_SNAP_IP) - 1;
memcpy(ptr, S_LLC_SNAP_IP, len);
ptr += len;
#if 1
//version=4; header_length=20; services=0
len = 2;
memcpy(ptr, "\x45\x00", len);
ptr += len;
//ip total length
memcpy(ptr, &iplen, len);
ptr += len;
/* no guesswork */
if (!weight) {
*clen = ptr - ((unsigned char*)clear);
return 1;
}
#if 1
/* setting IP ID 0 is ok, as we
* bruteforce it later
*/
//ID=0
len=2;
memcpy(ptr, "\x00\x00", len);
ptr += len;
//ip flags=don't fragment
len=2;
memcpy(ptr, "\x40\x00", len);
ptr += len;
#endif
#endif
len = ptr - ((unsigned char*)clear);
*clen = len;
memcpy(clear+32, clear, len);
memcpy(clear+32+14, "\x00\x00", 2); //ip flags=none
num=2;
assert(weight);
weight[0] = 220;
weight[1] = 36;
return num;
}
}
/* derive the pairwise transcient keys from a bunch of stuff */
int calc_ptk( struct WPA_ST_info *wpa, unsigned char pmk[32] )
{
int i;
unsigned char pke[100];
unsigned char mic[20];
memcpy( pke, "Pairwise key expansion", 23 );
if( memcmp( wpa->stmac, wpa->bssid, 6 ) < 0 )
{
memcpy( pke + 23, wpa->stmac, 6 );
memcpy( pke + 29, wpa->bssid, 6 );
}
else
{
memcpy( pke + 23, wpa->bssid, 6 );
memcpy( pke + 29, wpa->stmac, 6 );
}
if( memcmp( wpa->snonce, wpa->anonce, 32 ) < 0 )
{
memcpy( pke + 35, wpa->snonce, 32 );
memcpy( pke + 67, wpa->anonce, 32 );
}
else
{
memcpy( pke + 35, wpa->anonce, 32 );
memcpy( pke + 67, wpa->snonce, 32 );
}
for( i = 0; i < 4; i++ )
{
pke[99] = i;
HMAC(EVP_sha1(), pmk, 32, pke, 100, wpa->ptk + i * 20, NULL );
}
/* check the EAPOL frame MIC */
if( ( wpa->keyver & 0x07 ) == 1 )
HMAC(EVP_md5(), wpa->ptk, 16, wpa->eapol, wpa->eapol_size, mic, NULL );
else
HMAC(EVP_sha1(), wpa->ptk, 16, wpa->eapol, wpa->eapol_size, mic, NULL );
return( memcmp( mic, wpa->keymic, 16 ) == 0 );
}
int init_michael(struct Michael *mic, unsigned char key[8])
{
mic->key0 = key[0]<<0 | key[1]<<8 | key[2]<<16 | key[3]<<24;
mic->key1 = key[4]<<0 | key[5]<<8 | key[6]<<16 | key[7]<<24;
// and reset the message
mic->left = mic->key0;
mic->right = mic->key1;
mic->nBytesInM = 0;
mic->message = 0;
return 0;
}
int michael_append_byte(struct Michael *mic, unsigned char byte)
{
mic->message |= (byte << (8*mic->nBytesInM));
mic->nBytesInM++;
// Process the word if it is full.
if( mic->nBytesInM >= 4 )
{
mic->left ^= mic->message;
mic->right ^= ROL32( mic->left, 17 );
mic->left += mic->right;
mic->right ^= ((mic->left & 0xff00ff00) >> 8) | ((mic->left & 0x00ff00ff) << 8);
mic->left += mic->right;
mic->right ^= ROL32( mic->left, 3 );
mic->left += mic->right;
mic->right ^= ROR32( mic->left, 2 );
mic->left += mic->right;
// Clear the buffer
mic->message = 0;
mic->nBytesInM = 0;
}
return 0;
}
int michael_remove_byte(struct Michael *mic, unsigned char bytes[4])
{
if( mic->nBytesInM == 0 )
{
// Clear the buffer
mic->message = bytes[0] << 0 | bytes[1] << 8 | bytes[2] << 16 | bytes[3] << 24;
mic->nBytesInM = 4;
mic->left -= mic->right;
mic->right ^= ROR32( mic->left, 2 );
mic->left -= mic->right;
mic->right ^= ROL32( mic->left, 3 );
mic->left -= mic->right;
mic->right ^= ((mic->left & 0xff00ff00) >> 8) | ((mic->left & 0x00ff00ff) << 8);
mic->left -= mic->right;
mic->right ^= ROL32( mic->left, 17 );
mic->left ^= mic->message;
}
mic->nBytesInM--;
mic->message &= ~(0xFF << (8*mic->nBytesInM));
return 0;
}
int michael_append(struct Michael *mic, unsigned char *bytes, int length)
{
while(length > 0)
{
michael_append_byte(mic, *bytes++);
length--;
}
return 0;
}
int michael_remove(struct Michael *mic, unsigned char *bytes, int length)
{
while(length >= 4)
{
michael_remove_byte(mic, (bytes+length-4));
length--;
}
return 0;
}
int michael_finalize(struct Michael *mic)
{
// Append the minimum padding
michael_append_byte(mic, 0x5a );
michael_append_byte(mic, 0 );
michael_append_byte(mic, 0 );
michael_append_byte(mic, 0 );
michael_append_byte(mic, 0 );
// and then zeroes until the length is a multiple of 4
while( mic->nBytesInM != 0 )
{
michael_append_byte(mic, 0 );
}
// The appendByte function has already computed the result.
mic->mic[0] = (mic->left >> 0 ) & 0xff;
mic->mic[1] = (mic->left >> 8 ) & 0xff;
mic->mic[2] = (mic->left >> 16) & 0xff;
mic->mic[3] = (mic->left >> 24) & 0xff;
mic->mic[4] = (mic->right >> 0 ) & 0xff;
mic->mic[5] = (mic->right >> 8 ) & 0xff;
mic->mic[6] = (mic->right >> 16) & 0xff;
mic->mic[7] = (mic->right >> 24) & 0xff;
return 0;
}
int michael_finalize_zero(struct Michael *mic)
{
// Append the minimum padding
michael_append_byte(mic, 0 );
michael_append_byte(mic, 0 );
michael_append_byte(mic, 0 );
michael_append_byte(mic, 0 );
michael_append_byte(mic, 0 );
// and then zeroes until the length is a multiple of 4
while( mic->nBytesInM != 0 )
{
michael_append_byte(mic, 0 );
}
// The appendByte function has already computed the result.
mic->mic[0] = (mic->left >> 0 ) & 0xff;
mic->mic[1] = (mic->left >> 8 ) & 0xff;
mic->mic[2] = (mic->left >> 16) & 0xff;
mic->mic[3] = (mic->left >> 24) & 0xff;
mic->mic[4] = (mic->right >> 0 ) & 0xff;
mic->mic[5] = (mic->right >> 8 ) & 0xff;
mic->mic[6] = (mic->right >> 16) & 0xff;
mic->mic[7] = (mic->right >> 24) & 0xff;
return 0;
}
int michael_test(unsigned char key[8], unsigned char *message, int length, unsigned char out[8])
{
int i=0;
struct Michael mic0;
struct Michael mic1;
struct Michael mic2;
struct Michael mic;
init_michael(&mic0, (unsigned char*)"\x00\x00\x00\x00\x00\x00\x00\x00");
init_michael(&mic1, (unsigned char*)"\x00\x00\x00\x00\x00\x00\x00\x00");
init_michael(&mic2, (unsigned char*)"\x00\x00\x00\x00\x00\x00\x00\x00");
michael_append_byte(&mic0, 0x02);
michael_append_byte(&mic1, 0x01);
michael_append_byte(&mic2, 0x03);
michael_finalize(&mic0);
michael_finalize_zero(&mic1);
michael_finalize(&mic2);
printf("Blub 2:");
for(i=0; i<8; i++)
{
printf("%02X ", mic0.mic[i]);
}
printf("\n");
printf("Blub 1:");
for(i=0; i<8; i++)
{
printf("%02X ", mic1.mic[i]);
}
printf("\n");
printf("Blub 3:");
for(i=0; i<8; i++)
{
printf("%02X ", mic2.mic[i]);
}
printf("\n");
init_michael(&mic, key);
michael_append(&mic, message, length);
michael_finalize(&mic);
return (memcmp(mic.mic, out, 8) == 0);
}
int calc_tkip_mic_key(unsigned char* packet, int length, unsigned char key[8])
{
int z, is_qos=0;
unsigned char smac[6], dmac[6], bssid[6];
unsigned char prio[4];
unsigned char message[4096];
unsigned char *ptr;
struct Michael mic;
memset(message, 0, 4096);
z = ( ( packet[1] & 3 ) != 3 ) ? 24 : 30;
if(length < z) return 0;
/* Check if 802.11e (QoS) */
if( (packet[0] & 0x80) == 0x80)
{
z+=2;
is_qos = 1;
}
memset(prio, 0, 4);
if(is_qos)
{
prio[0] = packet[z-2] & 0x0f;
}
switch( packet[1] & 3 )
{
case 0:
memcpy( bssid, packet + 16, 6 );
memcpy( dmac, packet + 4, 6 );
memcpy( smac, packet + 10, 6 );
break;
case 1:
memcpy( bssid, packet + 4, 6 );
memcpy( dmac, packet + 16, 6 );
memcpy( smac, packet + 10, 6 );
break;
case 2:
memcpy( bssid, packet + 10, 6 );
memcpy( dmac, packet + 4, 6 );
memcpy( smac, packet + 16, 6 );
break;
default:
memcpy( bssid, packet + 10, 6 );
memcpy( dmac, packet + 16, 6 );
memcpy( smac, packet + 24, 6 );
break;
}
ptr = message;
memcpy(ptr, dmac, 6); ptr+=6;
memcpy(ptr, smac, 6); ptr+=6;
memcpy(ptr, prio, 4); ptr+=4;
memcpy(ptr, packet+z, length-z-8); ptr+=length-z-8;
memcpy(ptr, "\x5a", 1); ptr+=1;
memcpy(ptr, ZERO, 4); ptr+=4;
if((ptr-message) % 4 > 0)
memcpy(ptr, ZERO, 4-((ptr-message)%4)); ptr+=4-((ptr-message)%4);
init_michael(&mic, packet+length-8);
michael_remove(&mic, message, (ptr-message));
mic.mic[0] = (mic.left >> 0 ) & 0xFF;
mic.mic[1] = (mic.left >> 8 ) & 0xFF;
mic.mic[2] = (mic.left >> 16) & 0xFF;
mic.mic[3] = (mic.left >> 24) & 0xFF;
mic.mic[4] = (mic.right >> 0 ) & 0xFF;
mic.mic[5] = (mic.right >> 8 ) & 0xFF;
mic.mic[6] = (mic.right >> 16) & 0xFF;
mic.mic[7] = (mic.right >> 24) & 0xFF;
memcpy(key, mic.mic, 8);
return 0;
}
int calc_tkip_mic(unsigned char* packet, int length, unsigned char ptk[80], unsigned char value[8])
{
int z, koffset=0, is_qos=0;
unsigned char smac[6], dmac[6], bssid[6];
unsigned char prio[4];
struct Michael mic;
z = ( ( packet[1] & 3 ) != 3 ) ? 24 : 30;
if(length < z) return 0;
/* Check if 802.11e (QoS) */
if( (packet[0] & 0x80) == 0x80)
{
z+=2;
is_qos = 1;
}
switch( packet[1] & 3 )
{
case 0:
memcpy( bssid, packet + 16, 6 );
memcpy( dmac, packet + 4, 6 );
memcpy( smac, packet + 10, 6 );
break;
case 1:
memcpy( bssid, packet + 4, 6 );
memcpy( dmac, packet + 16, 6 );
memcpy( smac, packet + 10, 6 );
koffset = 48+8;
break;
case 2:
memcpy( bssid, packet + 10, 6 );
memcpy( dmac, packet + 4, 6 );
memcpy( smac, packet + 16, 6 );
koffset = 48;
break;
default:
memcpy( bssid, packet + 10, 6 );
memcpy( dmac, packet + 16, 6 );
memcpy( smac, packet + 24, 6 );
break;
}
if(koffset != 48 && koffset != 48+8)
return 1;
init_michael(&mic, ptk+koffset);
michael_append(&mic, dmac, 6);