====== Generating hashes from a string with a Yubikey ======


Use Yubikey authenticator to set up a challenge-response algorithm in slot 2 of your Yubikey. Then, make sure you have the command line tool ''ykchalresp'' installed. It usually comes packaged with the Yubikey personalization tool, e.g. on macOS via Homebrew:

<code>
brew install ykpers
</code>

Then, use the command to read a string from stdin and hash it with the challenge-response credential in slot 2 of your Yubikey:

<code>
ykchalresp -2 -i-
</code>

After entering your string, press CTRL-D twice, and touch your Yubikey. This will generate the hash.


{{tag>Yubikey ykchalresp}}