ref: 8e56bd06b559b45d6a8544ae2b1f752a5b3da516
dir: /sys/src/libc/port/netcrypt.c/
#include <u.h>
#include <libc.h>
int
netcrypt(void *key, void *chal)
{
uchar buf[8], *p;
strncpy((char*)buf, chal, 7);
buf[7] = '\0';
for(p = buf; *p && *p != '\n'; p++)
;
*p = '\0';
encrypt(key, buf, 8);
sprint(chal, "%.2ux%.2ux%.2ux%.2ux", buf[0], buf[1], buf[2], buf[3]);
return 1;
}