# Rough Cut at v0.01 Proof of Concept Feature Set

[[PageOutline]]

This is a proposed version 0.01 product as a proof of concept.  The
intent is not to have a very useful product, but rather to gain
confidence in our architecture, tools, and team.  The result is intended
to be the basis for further development into a more useful second stage,
in the sense of
[agile development](https://en.wikipedia.org/wiki/Agile_software_development).
It very intentionally is not a
[waterfall design](https://en.wikipedia.org/wiki/Waterfall_model),

The interface between the Green and Yellow layers is seen as an important design
inflection.

Some code will be in C in the Green (auxiliary core) because we can get it open
source out of the can.  for v.2 (or whatever) we would move it down to the FPGA in
Verilog.

## FPGA Overview
<img src="HW_sketch_v0001.png">
  

  

## Sketch of TRNG Chain
<img src="HW_RNG.png​">
  

  


## Off-FPGA

* Persistent Storage
    * For Keys and Time
    * Or the battery for tamper wipe is big enough to hold the FPGA up
    * Or the Green processor has enough non-volatile store
* Entropy Source
* Realtime Clock
* Tamper Mechanism


## Layers

```
#!html
<h1 style="text-align: left; color: blue">
  Blue / FPGA
</h1>
```


* TRNG
* BigNumber, Modular, & Exponentiation (expose to green for RSA)
* SHA-256
* AES-128
* EC for ECDH. Curve3617 would be nice, but whatever we can get open source to start
* OpenRISC Core or ARM to support Green (maybe FreeScale from Bunnie)


```
#!html
<h1 style="text-align: left; color: green">
  Green / On-Chip Core
</h1>
```


* RSA 2048 & 4096 (move to blue later) [ 1024 for Tor? ]
* MACs: HMAC, 1305, uMAC
* DH (move to blue later)
* Device Activation, Move Authorization, Wiping


```
#!html
<h1 style="text-align: left; color: yellow">
  Yellow / Off-Chip Support
</h1>
```


* Interface to Red
    * PKCS!#8
    * PKCS!#11
    * PGP Support
* X.509 and PGP
* PKCS!#11 for POLA resistance
* No PKCS!#10 because it will take a year
* Backup may be just dump/restore of the whole FPGA/CoreState


```
#!html
<h1 style="text-align: left; color: red">
  Red / Applications
</h1>
```


* X.509 CA
* DNSSEC
* PGP (asymmetric key sign/verify + symmetric message encryption/decryption)
* Tor consensus(?)


## Issues in v0.01


* License of tool chain to build
* License for borrowed components (open cores, open fpga)
* License for result
    * What we build ourselves - BSD
    * What components we ship - life is compromise
* Toolchains, Verilog, C, ...
* FPGAs and ASICs use a Verilog-based toolchain.  There are no mature open

  Verilog compilers so the [DDC approach](http://www.dwheeler.com/trusting-trust/)
  will not work.  Net-list optimization is also an issue.  We're looking into this,
  but it's going to be really hard.  Research for v2.

* Protoyping platform
    * [Bunnie's Novena laptop](http://www.bunniestudios.com/blog/?p=3265)
    * Altera Evaluation Board
* RTC, external connectivity to et some sort of assured time
* Repository - too many git junkies.  Keep main repo on our server for the security boundary.  Can mirror on GitHub to be socially cool.
* Emacs or vi (no Rob, not TECO) :)