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/* $OpenBSD: urng.c,v 1.2 2017/08/29 17:39:22 jasper Exp $ */
/*
* Copyright (c) 2017 Jasper Lievisse Adriaanse <jasper@openbsd.org>
* Copyright (c) 2017 Aaron Bieber <abieber@openbsd.org>
* Copyright (C) 2015 Sean Levy <attila@stalphonsos.com>
* Copyright (c) 2007 Marc Balmer <mbalmer@openbsd.org>
* Copyright (c) 2006 Alexander Yurchenko <grange@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Universal TRNG driver for a collection of TRNG devices:
* - ChaosKey TRNG
* http://altusmetrum.org/ChaosKey/
* - Alea II TRNG. Produces 100kbit/sec of entropy by black magic
* http://www.araneus.fi/products/alea2/en/
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/timeout.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdevs.h>
#include <dev/rndvar.h>
#define DEVNAME(_sc) ((_sc)->sc_dev.dv_xname)
#ifdef URNG_DEBUG
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
struct urng_chip {
int bufsiz;
int endpoint;
int iface;
int msecs;
int read_timeout;
};
struct urng_softc {
struct device sc_dev;
struct usbd_device *sc_udev;
struct usbd_pipe *sc_outpipe;
struct timeout sc_timeout;
struct usb_task sc_task;
struct usbd_xfer *sc_xfer;
struct urng_chip sc_chip;
int *sc_buf;
};
int urng_match(struct device *, void *, void *);
void urng_attach(struct device *, struct device *, void *);
int urng_detach(struct device *, int);
void urng_task(void *);
void urng_timeout(void *);
struct cfdriver urng_cd = {
NULL, "urng", DV_DULL
};
const struct cfattach urng_ca = {
sizeof(struct urng_softc), urng_match, urng_attach, urng_detach
};
struct urng_type {
struct usb_devno urng_dev;
struct urng_chip urng_chip;
};
static const struct urng_type urng_devs[] = {
{ { USB_VENDOR_OPENMOKO2, USB_PRODUCT_OPENMOKO2_CHAOSKEY },
{64, 6, 0, 100, 5000} },
{ { USB_VENDOR_ARANEUS, USB_PRODUCT_ARANEUS_ALEA },
{128, 1, 0, 100, 5000} },
};
#define urng_lookup(v, p) ((struct urng_type *)usb_lookup(urng_devs, v, p))
int
urng_match(struct device *parent, void *match, void *aux)
{
struct usb_attach_arg *uaa = aux;
if (uaa->iface == NULL)
return (UMATCH_NONE);
if (urng_lookup(uaa->vendor, uaa->product) != NULL)
return (UMATCH_VENDOR_PRODUCT);
return (UMATCH_NONE);
}
void
urng_attach(struct device *parent, struct device *self, void *aux)
{
struct urng_softc *sc = (struct urng_softc *)self;
struct usb_attach_arg *uaa = aux;
usb_interface_descriptor_t *id;
usb_endpoint_descriptor_t *ed;
int ep_ibulk = -1;
usbd_status error;
int i;
sc->sc_udev = uaa->device;
sc->sc_chip = urng_lookup(uaa->vendor, uaa->product)->urng_chip;
DPRINTF(("%s: bufsiz: %d, endpoint: %d iface: %d, msecs: %d, read_timeout: %d\n",
DEVNAME(sc),
sc->sc_chip.bufsiz,
sc->sc_chip.endpoint,
sc->sc_chip.iface,
sc->sc_chip.msecs,
sc->sc_chip.read_timeout));
id = usbd_get_interface_descriptor(uaa->iface);
for (i = 0; i < id->bNumEndpoints; i++) {
ed = usbd_interface2endpoint_descriptor(uaa->iface, i);
if (ed == NULL) {
printf("%s: failed to get endpoint %d descriptor\n",
DEVNAME(sc), i);
return;
}
if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK &&
UE_GET_ADDR(ed->bEndpointAddress) == sc->sc_chip.endpoint) {
ep_ibulk = ed->bEndpointAddress;
break;
}
}
if (ep_ibulk == -1) {
printf("%s: missing endpoint\n", DEVNAME(sc));
return;
}
error = usbd_open_pipe(uaa->iface, ep_ibulk, USBD_EXCLUSIVE_USE,
&sc->sc_outpipe);
if (error) {
printf("%s: failed to open bulk-in pipe: %s\n",
DEVNAME(sc), usbd_errstr(error));
return;
}
sc->sc_xfer = usbd_alloc_xfer(sc->sc_udev);
if (sc->sc_xfer == NULL) {
printf("%s: could not alloc xfer\n", DEVNAME(sc));
return;
}
sc->sc_buf = usbd_alloc_buffer(sc->sc_xfer, sc->sc_chip.bufsiz);
if (sc->sc_buf == NULL) {
printf("%s: could not alloc %d-byte buffer\n", DEVNAME(sc),
sc->sc_chip.bufsiz);
return;
}
usb_init_task(&sc->sc_task, urng_task, sc, USB_TASK_TYPE_GENERIC);
timeout_set(&sc->sc_timeout, urng_timeout, sc);
usb_add_task(sc->sc_udev, &sc->sc_task);
return;
}
int
urng_detach(struct device *self, int flags)
{
struct urng_softc *sc = (struct urng_softc *)self;
usb_rem_task(sc->sc_udev, &sc->sc_task);
if (timeout_initialized(&sc->sc_timeout))
timeout_del(&sc->sc_timeout);
if (sc->sc_xfer)
usbd_free_xfer(sc->sc_xfer);
if (sc->sc_outpipe != NULL)
usbd_close_pipe(sc->sc_outpipe);
return (0);
}
void
urng_task(void *arg)
{
struct urng_softc *sc = (struct urng_softc *)arg;
usbd_status error;
u_int32_t len, i;
usbd_setup_xfer(sc->sc_xfer, sc->sc_outpipe, NULL, sc->sc_buf,
sc->sc_chip.bufsiz, USBD_SHORT_XFER_OK | USBD_SYNCHRONOUS,
sc->sc_chip.read_timeout, NULL);
error = usbd_transfer(sc->sc_xfer);
if (error) {
printf("%s: xfer failed: %s\n", DEVNAME(sc),
usbd_errstr(error));
goto bail;
}
usbd_get_xfer_status(sc->sc_xfer, NULL, NULL, &len, NULL);
if (len < sizeof(int)) {
printf("%s: xfer too short (%u bytes) - dropping\n",
DEVNAME(sc), len);
goto bail;
}
len /= sizeof(int);
for (i = 0; i < len; i++) {
add_true_randomness(sc->sc_buf[i]);
}
bail:
timeout_add_msec(&sc->sc_timeout, sc->sc_chip.msecs);
}
void
urng_timeout(void *arg)
{
struct urng_softc *sc = arg;
usb_add_task(sc->sc_udev, &sc->sc_task);
}
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