mac to sha1

mac_to_sha1.C

#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <string.h>
#include <openssl/sha.h>
#include <stdlib.h>
#include <unistd.h>

int main( int argc, char *argv[] )
{
	int s;
	struct ifreq buf;
	char mac[20];
    char sha1[40];
    unsigned char obuf[20];
    int i = 0;

	memset( &mac , 0,    sizeof( mac ) );
    memset( &sha1, 0,    sizeof( sha1 ) );
	memset( &buf , 0x00, sizeof( buf ) );

	s = socket( PF_INET, SOCK_DGRAM, 0 );

	strcpy( buf.ifr_name, "eth0" );

	ioctl( s, SIOCGIFHWADDR, &buf );

	close( s );

	for( s = 0; s < 6; s++ )
	{
        char currentHex[2];
		snprintf( currentHex, 4, "%.2X", ( unsigned char )buf.ifr_hwaddr.sa_data[s] );
		int j;
		for( j = 0; j < 2; j++ )
		{
		    mac[i++] = currentHex[j];
		}
		if( s < 5 )
		{
		    mac[i++] = ':';
		}
	}

    SHA1( ( unsigned char * ) mac, strlen( mac ), obuf );

    i = 0;

    for ( s = 0; s < 20; s++ )
    {
        char currentHex[2];
        snprintf( currentHex, 4, "%02x ", obuf[s] );
        for( int j = 0; j < 2; j++ )
		{
		    sha1[i++] = currentHex[j];
		}
    }

    printf( "%s\n", sha1 );

	return 0;
}

i have no idea why indentation is broken. :<