Linux kernel driver support

[jans23]

Similarly to ChaosKey, support for Infnoise by the Linux kernel would be appreciated. In that case Infnoise's random data should be feeded into kernel's LRNG which does the PRNG via ChaCha20 and alike.

[AidanGG]

I'm interested in having a look at how this might be done. Right now by default, the FT240XQ's ID 0403:6015 causes it to get picked up by the ftdi_sio driver in order to allow it to be used by the userspace driver libftdi. @manuel-domke would you happen to have a leetronics USB VID and suggested PID that could be used to reprogram existing Infnoises with?

[AidanGG]

Looks like I can use 1209:3701 according to https://pid.codes/1209/3701/. Now it should be a matter of intercepting the URBs eventually fired off by libinfnoise since the FTDI protocol isn't well documented (https://krinkinmu.github.io/2020/09/05/ftdi-protocol.html) and recreating them in the kernel driver.

From what I can tell from a cursory glance over the libinfnoise source, there would be control URBs for setting things such as baud rate, pin mode mask and synchronous bitbang mode, and bulk URBs for writing the bitbang clock for the switches and reading from the comparators

[stuartpb]

@AidanGG Any progress on this?

[AidanGG]

Sadly not, unfortunately. I have mostly stopped using the infnoise.

[ZAlexanderV]

@AidanGG what did you switch to ?
@manuel-domke @stuartpb any chance to move it forward ?
I think this would greatly increase usability.

[Strykar]

In case anyone else wanted to write a kernel driver for the infnoise, here's one approach - https://github.com/tectrolabs/swiftrng/blob/master/linux/swrandom/swrandom.c