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How To Attach a YubiHSM Hard Wallet

Goal

Attach a YubiHSM as a hard wallet

Before you begin

  • Install the currently supported version of keosd
  • Install YubiHSM2 Software Toolkit (YubiHSM2 SDK)
  • Create an AuthKey with at least the following Capabilities:

    • sign-ecdsa
    • generate-asymmetric-key
    • export-wrapped
  • Delete the default AuthKey
Security

It is extremely important to create a new AuthKey and remove the default AuthKey before proceed to the following steps.

Steps

Configure keosd

There are two options to connect keosd to YubiHSM:

Using a YubiHSM connector

By default, keosd will connect to the YubiHSM connector on the default host and port. If a non-default URL is used, set the --yubihsm-url option or yubihsm-url in config.ini with the correct connector URL

Directly connect via USB

keosd also can directly connect to YubiHSM via USB protocol

If this option is used, set keosd startup option as the below:

--yubihsm-url=ysb://

Start keosd with AuthKey:

--yubihsm-authkey Your_AuthKey_Object_Number

if a YubiHSM connector is used, check the YubiHSM connector is up and running by visiting YubiHSM URL: http://YubiHSM_HOST:YubiHSM_PORT/connector/status ((Default HOST and Port: http://127.0.0.1:12345)

You should see something like this:

status=OK
serial=*
version=2.0.0
pid=666
address=localhost
port=12345

Unlock YubiHSM wallet with the password of AuthKey using the following option:

cleos wallet unlock -n YubiHSM --password YOUR_AUTHKEY_PASSWORD

After unlocking the wallet, you can use cleos wallet commands as usual. Beware as a part of security mechanism, some wallet subcommands, such as retrieve private keys, or remove a key, are not supported when a YubiHSM is used