#include <stdio.h>#define SWAP(x,y) { unsigned char tmp = x; x = y; y = tmp; }int main( int argc, char *argv[] ){    int i, j, n;    FILE *f_ivs_out;    unsigned char K[16];    unsigned char S[256];    unsigned char buffer[64], *s;    if( argc != 3 )    {        printf( "usage: makeivs <ivs file> <104-bit key>\n" );        return( 1 );    }    i = 0;    s = (unsigned char *) argv[2];    buffer[0] = s[0];    buffer[1] = s[1];    buffer[2] = '\0';    while( sscanf( buffer, "%x", &n ) == 1 )    {        if( n < 0 || n > 255 )        {            fprintf( stderr, "Invalid wep key.\n" );            return( 1 );        }        K[3 + i++] = n;        if( i >= 16 ) break;        s += 2;        if( s[0] == ':' || s[0] == '-' )            s++;        if( s[0] == '\0' || s[1] == '\0' )            break;                buffer[0] = s[0];        buffer[1] = s[1];    }    if( i != 13 )    {        fprintf( stderr, "Invalid wep key.\n" );        return( 1 );    }    if( ( f_ivs_out = fopen( argv[1], "wb+" ) ) == NULL )    {        perror( "fopen" );        return( 1 );    }    fprintf( f_ivs_out, "\xBF\xCA\x84\xD4\x01\x01\x01\x01\x01\x01" );    for( n = 0x000000; n <= 0x0FFFFF; n++ )    {        K[2] = ( n >> 16 ) & 0xFF;        K[1] = ( n >>  8 ) & 0xFF;        K[0] = ( n       ) & 0xFF;        fprintf( f_ivs_out, "%c%c%c", K[0], K[1], K[2] );        for( i = 0; i < 256; i++ )            S[i] = i;        for( i = j = 0; i < 256; i++ )        {            j = ( j + S[i] + K[i & 15] ) & 0xFF;            SWAP( S[i], S[j] );        }        i = 1; j = ( 0 + S[i] ) & 0xFF; SWAP(S[i], S[j]);        fprintf( f_ivs_out, "%c", 0xAA ^ S[(S[i] + S[j]) & 0xFF] );        i = 2; j = ( j + S[i] ) & 0xFF; SWAP(S[i], S[j]);        fprintf( f_ivs_out, "%c\xFF", 0xAA ^ S[(S[i] + S[j]) & 0xFF] );    }    fclose( f_ivs_out );    printf( "Done.\n" );    return( 0 );}