Was this an encryption library by any chance? Generating pgp keys to yubikey with an offline master involved having a system with rust toolchain in order to bui

Was this an encryption library by any chance? Generating pgp keys to yubikey with an offline master involved having a system with rust toolchain in order to build a Python lib I required for a Yubikey utility. I could have got around it, but it took me by surprise that a Python dep required it. Not being negative or criticising the fact, just first time I had observed it.