On Thu, May 5, 2016 at 9:10 AM, Josh Datko <jbda...@gmail.com> wrote: > 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.
I forget how fast those chips were (?) > 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. "cerowrt" as "cerowrt" is dead, I'm doing as much work as possible in the easier to debug x86 world. > 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. Meh. If there is a decent gpio header on j.random x86 board, I'd just as soon use that. > > 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. > > > -- Dave Täht Let's go make home routers and wifi faster! With better software! http://blog.cerowrt.org _______________________________________________ Cerowrt-devel mailing list Cerowrt-devel@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cerowrt-devel
