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-= External project TorHSM

-

-== Problem

-

-The [https://www.torproject.org/about/overview.html.en Tor network] is defined by a small number, about ten, of special relays called Directory Authorities (DAs).

-

-Directory Authorities sign the critical `status votes` and `consensus status` documents using SHA-1 and SHA-256 together with RSA-2048 or RSA-3072 once per hour, using medium-term on-line `authority signing keys` signed by their individual off-line long-term `authority identity keys`. Authority signing keys typically have a lifetime of three to twelve months.

-

-Authority signing keys are currently kept on the same general purpose computer that runs the Directory Authority and are thus subject to a large number of network threats.

-

-== Proposed solution

-

-Move `authority signing keys` away from the general purpose computer onto an external device which can sign the consensus document without exposing key material to the networked computer system.

-

-The !CrypTech project has created an open source (BSD licensed) `Alpha` hardware which would be especially suitable, because the open software and hardware offers unprecedented transparency while also enabling a simple, efficient and legacy-free solution.

-

-=== Current typical key roll-over procedure

-

-* Generate new `authority signing key` on offline system

-* Sign new key using `authority identity key` on offline system

-* Save new `authority signing key` and `key certificate` on USB stick

-* Transfer new `authority signing key` and `key certificate` to DA system via network

-

-=== The key roll-over procedure becomes

-

-* Use administrative tool from this project on DA system to generate new `authority signing key` on HSM

-  * The new `authority signing key` initially remains inactive and unavailable for use

-  * The public part of new `authority signing key` is exported from HSM onto the DA system

-* Transfer new public part of `authority signing key` to USB stick

-* Sign new public key using `authority identity key` on offline system

-* Save `key certificate` on USB stick

-* Transfer `key certificate` to DA system via network and make available to DA

-* (Optional?) Use administrative tool from this project on DA to present `key certificate` to HSM

-* Activate key (automatic on verified `key certificate`, manual without `key certificate` verification)

-

-== Milestones

-

-The minimum viable product (MVP) at MS3 is a system where the authority signing key is no longer accessible by the DA system while not making any part of the process worse from a security perspective.

-

-The system at MS6 (to MS8) does not make any part of the process worse from a //usability// perspective (subjective) and also adds rate limiting.

-

-=== MS1 -- PoC using OpenSSL `PKCS#11` engine

-* tor using openssl p11 engine; no key management or rate-limiting

-* useful for test and verification

-

-=== MS2 -- Using !CrypTech RPC instead of OpenSSL

-* function declarations in `sw/libhal/hal.h`, definitions in `sw/libhal/rpc_*.c`

-* TODO: daemon

-

-=== MS3 (MVP) -- HSM configuration I

-* "HSM configuration" is aka "key management"

-* administrator connected to MGMT can make HSM

-  * generate a MK based on passphrase

-  * print public part of MK

-* administrator connected to USER can make HSM

-    * generate a new authority signing key pair, wrap the secret part in MK, store both parts in flash memory and export the public part

-

-=== MS4 -- HSM configuration II

-* rate limiting 

-* enforcing key validity

-

-=== MS5 -- Enforcing key validity HSM side

-

-=== MS6 -- Rate limiting of signatures

-

-=== MS7 -- New Shiny Crypto Hardware API using !CrypTech RPC

-

-=== MS8 -- Getting entropy from HSM

-

-=== MS9 -- Support for more protocols in New Shiny Crypto Hardware API

-

-== References

-

-* [https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt Tor directory protocol, version 3]

-* [https://www.crowdsupply.com/cryptech/open-hardware-security-module CrypTech Alpha system]

-