extern char *srcfname, *dstfname, *do_mac_file, *counter_file, *sksum_hashlist_file;
extern char *saltf, *genkeyf, *mackeyf, *tweakf;
extern char *pw_prompt, *mac_pw_prompt;
extern char *srcfname, *dstfname, *do_mac_file, *counter_file, *sksum_hashlist_file;
extern char *saltf, *genkeyf, *mackeyf, *tweakf;
extern char *pw_prompt, *mac_pw_prompt;