On Wed, 2016-05-04 at 16:28 -0700, Dave Taht wrote: > so I figure that there might be something even simpler out there from > the pi-ish or beaglebone world that could be repurposed to suit?
I've used Atmel's CryptoAuthentication chips routinely. They are i2c based and have a (proprietary) RNG on them. I have a few linux driver options for using them. Presumably, you want this HWRNG thing to be inside the case. Looking at that pdf, jumper J4 says it's an I2C connector. Those Atmel chips I was playing with are all i2c, so you could try flywiring those to the connector. I'm not sure what pin is what, but PWR and GND should be easy to find and then SDA/SCL I just plug and and try. If it doesn't work, swap the pins. As long as the CPU has access to that i2c bus, (is there an i2c-tools equivalent on cerowrt?), then you should see it. miniPCIe has I2C as well. I had this idea once to take a miniPCI card and solder the atmel chips to the SDA/SCL lines. 8-pin molex connectors should be easy to find and it probably wouldn't be too bad to make it a "proper" expansion board, but ... loose wires make life more exciting :) Josh links: Out-of-tree kernel driver for Atmel AT204/108/508 chips with /dev/hwrng support: https://github.com/cryptotronix/atsha204-i2c CLI application using the AT204: https://github.com/cryptotronix/hashle t Digikey: https://www.digikey.com/product-detail/en/atmel/ATECC508A-SSHD A-B/ATECC508A-SSHDA-B-ND/5213053 ^ The 204A are cheaper, the 508A have ECDSA/ECDH as well as the RNG and my "eclet" driver will support ecdsa signing/ecdh, so might as well get those vs. the 204A. _______________________________________________ Cerowrt-devel mailing list Cerowrt-devel@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cerowrt-devel
