Introduce Yubico's Modhex for Conversion

[linuxgemini]

Mod(ified)hex is Yubico's implementation for somewhat universal OTP entry from a single security key, regardless of keyboard layout (with few exceptions).

This PR implements basic conversion functionality by mapping the characters into hex and converting it back and forth.

Some information is available here: https://en.wikipedia.org/wiki/YubiKey#ModHex

[mattnotmitt]

Everything else looks pretty good to me.

[linuxgemini]

Signed-off-by: İlteriş Yağıztegin Eroğlu ilteris@asenkron.com.tr

[linuxgemini]

Are there any updates on the merging of this PR?

[a3957273]

Hey! This pull request has gotten rather old and that's our fault. This project stopped being actively maintained for a while and it looks like your pull request has started to gather dust. Would you be able to update your branch to the latest version of CyberChef and we'll give it a review?

[linuxgemini]

Hey! This pull request has gotten rather old and that's our fault. This project stopped being actively maintained for a while and it looks like your pull request has started to gather dust. Would you be able to update your branch to the latest version of CyberChef and we'll give it a review?

Heya! It sure did get dust 😅, I'll try re{bas,factor}ing the code to current CyberChef later today (June 12th). Will poke when its done.

[linuxgemini]

@a3957273 I think this should do it, I couldn't get tests working on macOS; so tests may or may not work.

[linuxgemini]

@a3957273 Hi again! Turns out I had some issues in the lib file, the test errors doesn't reflect anything back so it took me a while (perhaps improving test outputs would be a roadmap item?). This one (edd2237) should pass the tests.

Post test edit: Looks like UI tests failed, but the lib passed.