{"id":1562,"date":"2017-02-15T16:00:45","date_gmt":"2017-02-15T15:00:45","guid":{"rendered":"https:\/\/www.nico-maas.de\/?p=1562"},"modified":"2017-02-15T14:27:43","modified_gmt":"2017-02-15T13:27:43","slug":"raspberry-pi-and-its-hardware-random-number-generator-rng","status":"publish","type":"post","link":"https:\/\/www.nico-maas.de\/?p=1562","title":{"rendered":"Raspberry Pi and its Hardware Random Number Generator (RNG)"},"content":{"rendered":"

Due to a Stackoverflow Post I got to know the fact the BCM2708 \/\u00a0BCM2835 contains a Hardware Random Number Generator (RNG). Two blogposts described how to setup this little module, however, they were outdated, as the needed kernel module is directly baked into the latest 4.x kernel, which ends with the fact that \/dev\/hwrng already exists :).<\/p>\n

The only thing left to do is the installation of the\u00a0rng-tools, which is easy as pie:<\/p>\n

sudo apt-get update\r\nsudo apt-get install -y  rng-tools<\/pre>\n
After that, we also need to point rng-tools to the right source, by adding<\/p>\n
HRNGDEVICE=\/dev\/hwrng<\/pre>\n
to \/etc\/default\/rng-tools (need root rights for that :))<\/p>\n
After that, the service can be restarted and used:<\/p>\n
sudo service rng-tools restart<\/pre>\n
PS: This RNG seems to be available on all other RPis as well, not only RPi 1 \ud83d\ude42<\/p>\n
 <\/p>\n
Other articles:<\/p>\n
http:\/\/scruss.com\/blog\/2013\/06\/07\/well-that-was-unexpected-the-raspberry-pis-hardware-random-number-generator\/<\/a><\/p>\n
http:\/\/fios.sector16.net\/hardware-rng-on-raspberry-pi<\/a><\/p>\n