/* crypt.c by Michael Hanson */
/* you may use this, but not for profit, and give me credit */ 
/* encryption program, decryption program */
#include "stdio.h"
#include "errs.c"
#include "version.c"
#include "filp.c"

main(argc,argv)
int argc;
char *argv[];
{
	int c,i,keylen;

	if(ver() < 0x200){
		error("wrong DOS version",1);
#asm
	db 'by Michael Hanson v1.0',1ah
#	
	}
 	if ((argc > 1) && ((keylen = strlen(argv[1])) > 0))
		for (i=0; (c=getc(STDIN)) != EOF; i =(++i % keylen))
			putc((char)((char)c ^ (argv[1])[i]),STDOUT);
				/* xor c key[i] */
		else
			error("usage: crypt key.",1);
}