/*
 * ofpwgen: convert a string to an XOR'd
 * hex string that can be used as the value
 * for security-password in Open Firmware
 */
#include <sys/types.h>
#include <sys/param.h>
#include <stdio.h>
#include <string.h>

    int
main( int ac, char *av[] )
{
    /* stores password given by user */
    char	buf[ MAXPATHLEN ];

    int		i, c, val = 0;

    /* XOR key used by Open Firmware */
    int		x[ 2 ] = { 'A', 'A' };

    if ( ac != 2 ) {
	fprintf( stderr, "Usage: %s password\n", av[ 0 ] );
	exit( 1 );
    }

    if ( strlen( av[ 1 ] ) >= MAXPATHLEN ) {
	fprintf( stderr, "%s: too long\n", av[ 1 ] );
	exit( 2 );
    }
    strcpy( buf, av[ 1 ] );

    /* shifting magic, conversion from ASCII to hex */
    c = x[ 0 ];
    val = val << 4;
    val = val + c - 'A' + 10;
    val = val << 4;
    val = val + c - 'A' + 10;
    x[ 0 ] = val;

    val = 0;
    c = x[ 1 ];
    val = val << 4;
    val = val + c - 'A' + 10;
    val = val << 4;
    val = val + c - 'A' + 10;
    x[ 1 ] = val;

    /* print out the XOR'd version of pw in firmware format */
    for ( i = 0; i < strlen( buf ); i++ ) {
	printf( "%%%.2x", buf[ i ] ^ x[ i % 2 ] );
    }
    putc( '\n', stdout );

    return( 0 );
}