---
name: "uonerng"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/uonerng"
---

# uonerng(4)

Moonbase Otago OneRNG TRNG

## NAME

**uonerng** – Moonbase Otago OneRNG TRNG

## SYNOPSIS

**uonerng\* at uhub?**

## DESCRIPTION

The **uonerng** driver provides support for the Moonbase Otago OneRNG, a USB true random number generator (TRNG). **uonerng** reads raw entropy from the OneRNG and uses enqueue\_randomness(9) to add it to the system entropy pool.

The OneRNG is capable of operating in one of several modes, some of which are intended for production use and some of which are for testing and validating the hardware.

**uonerng** operates in the "Avalanche noise with whitener" mode, which is also the manufacturer's default mode.

## SEE ALSO

[intro(4)](/intro/4.md), [usb(4)](/usb/4.md), enqueue\_randomness(9)

Moonbase Otago: **https://onerng.info/onerng**

## HISTORY

The **uonerng** driver first appeared in OpenBSD 5.9.

## AUTHORS

The **uonerng** driver was written by Devin Reade ⟨*gdr@gno.org*⟩.

## BUGS

The OneRNG permits downloading of the device firmware so that one may check the firmware's cryptographic signature as provided by the manufacturer. The **uonerng** driver does not perform nor support this action. In order to currently perform such a validation, it would be necessary to disable **uonerng** in the kernel and then download the firmware via the OneRNG's emulated AT modem command set.