9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi/*
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi * This file and its contents are supplied under the terms of the
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi * Common Development and Distribution License ("CDDL"), version 1.0.
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi * You may only use this file in accordance with the terms of version
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi * 1.0 of the CDDL.
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi *
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi * A full copy of the text of the CDDL should have accompanied this
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi * source. A copy of the CDDL is also available via the Internet at
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi * http://www.illumos.org/license/CDDL.
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi */
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi/*
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi * Copyright (c) 2015, Joyent, Inc.
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi */
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi/*
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi * getentropy(3C) is an OpenBSD compatible wrapper around getrandom(2).
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi */
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi#include <errno.h>
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi#include <sys/random.h>
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchiint
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchigetentropy(void *buf, size_t buflen)
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi{
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi int ret;
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi if (buflen > 256) {
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi errno = EIO;
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi return (-1);
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi }
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi ret = getrandom(buf, buflen, 0);
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi if (ret == -1 || ret != buflen) {
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi if (errno != EFAULT)
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi errno = EIO;
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi return (-1);
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi }
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi return (0);
9d12795f87b63c2e39e87bff369182edd34677d3Robert Mustacchi}