1.\" $OpenBSD: urng.4,v 1.5 2018/04/28 15:44:59 jasper Exp $ 2.\" 3.\" Copyright (c) 2015 Sean Levy <attila@stalphonsos.com> 4.\" Copyright (c) 2017 Jasper Lievisse Adriaanse <jasper@openbsd.org> 5.\" 6.\" Permission to use, copy, modify, and distribute this software for any 7.\" purpose with or without fee is hereby granted, provided that the above 8.\" copyright notice and this permission notice appear in all copies. 9.\" 10.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17.\" 18.Dd $Mdocdate: April 28 2018 $ 19.Dt URNG 4 20.Os 21.Sh NAME 22.Nm urng 23.Nd USB Random Number Generator devices 24.Sh SYNOPSIS 25.Cd "urng* at uhub?" 26.Sh DESCRIPTION 27The 28.Nm 29driver provides support for various true random number generator 30(TRNG) devices connected via USB. 31.Nm 32reads raw entropy from the device at a (hardware dependent) interval 33and stirs it into the system entropy pool with 34.Xr enqueue_randomness 9 . 35.Sh HARDWARE 36The following devices are supported by this driver: 37.Bl -tag -width "Altus Metrum" 38.It Araneus Alea I and II 39Capable of delivering 100kbit/sec of hardware-generated entropy. 40.It Altus Metrum ChaosKey 1.0 41This device is capable of providing entropy at 10Mbit/s. 42.El 43.Sh SEE ALSO 44.Xr intro 4 , 45.Xr usb 4 , 46.Xr enqueue_randomness 9 47.Sh HISTORY 48The 49.Nm 50driver first appeared in 51.Ox 6.2 . 52.Sh AUTHORS 53The 54.Nm 55driver was written by 56.An Aaron Bieber Aq Mt abieber@openbsd.org , 57.An Jasper Lievisse Adriaanse Aq Mt jasper@openbsd.org , 58and 59.An Sean Levy Aq Mt attila@stalphonsos.com . 60