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urng: add micro non-physical true RNG based on timing jitter

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μrngd is OpenWrt's micro non-physical true random number generator based
on timing jitter.

Using the Jitter RNG core, the rngd provides an entropy source that
feeds into the Linux /dev/random device if its entropy runs low. It
updates the /dev/random entropy estimator such that the newly provided
entropy unblocks /dev/random.

The seeding of /dev/random also ensures that /dev/urandom benefits from
entropy. Especially during boot time, when the entropy of Linux is low,
the Jitter RNGd provides a source of sufficient entropy.

Tested-by: Lucian Cristian <lucian.cristian@gmail.com>
Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
Petr Štetiar 2019-05-20 14:02:20 +02:00
parent c53f62b111
commit 714bd89fce
2 changed files with 65 additions and 0 deletions
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48
package/system/urngd/Makefile Normal file
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include $(TOPDIR)/rules.mk
PKG_NAME:=urngd
PKG_RELEASE:=1
PKG_SOURCE_PROTO:=git
PKG_SOURCE_URL=https://github.com/ynezz/openwrt-urngd
PKG_SOURCE_DATE:=2019-05-27
PKG_SOURCE_VERSION:=41e4163b2e7f4c1c1f51cdfa487d6052ff859cf2
PKG_MIRROR_HASH:=303595b7ec7367264a159dbd26d1d18c7ee3cf5e10bab25a315a7ec621b80ab4
PKG_LICENSE:=GPL-2.0 BSD-3-Clause
PKG_LICENSE_FILES:=
PKG_BUILD_PARALLEL:=1
include $(INCLUDE_DIR)/package.mk
include $(INCLUDE_DIR)/cmake.mk
define Package/$(PKG_NAME)
SECTION:=utils
CATEGORY:=Base system
TITLE:=OpenWrt non-physical true random number generator based on timing jitter
DEPENDS:=+libubox
endef
define Package/$(PKG_NAME)/description
urngd is OpenWrt's micro non-physical true random number generator based on
timing jitter.
Using the Jitter RNG core, the rngd provides an entropy source that feeds into
the Linux /dev/random device if its entropy runs low. It updates the
/dev/random entropy estimator such that the newly provided entropy unblocks
/dev/random.
The seeding of /dev/random also ensures that /dev/urandom benefits from
entropy. Especially during boot time, when the entropy of Linux is low, the
Jitter RNGd provides a source of sufficient entropy.
endef
define Package/$(PKG_NAME)/install
$(INSTALL_DIR) $(1)/etc/init.d
$(INSTALL_BIN) ./files/$(PKG_NAME).init $(1)/etc/init.d/$(PKG_NAME)
$(INSTALL_DIR) $(1)/sbin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/$(PKG_NAME) $(1)/sbin/$(PKG_NAME)
endef
$(eval $(call BuildPackage,$(PKG_NAME)))

17
package/system/urngd/files/urngd.init Normal file
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#!/bin/sh /etc/rc.common
START=00
USE_PROCD=1
NAME=urngd
PROG=/sbin/urngd
start_service() {
procd_open_instance
procd_set_param command "$PROG"
procd_close_instance
}
reload_service() {
procd_send_signal $PROG
}