The most involved thing I’ve had to learn this year is how to actually use PKCS #11 to talk to crypto hardware. It’s actually not that clear. Most of the examples are buried in random bits of C from vendors like Oracle or IBM; and the spec itself is pretty dense. Especially when it comes to understanding how you actually use it, and what all the bits and pieces do.
In honour of our Prime Minister saying he should have NOBUS access into our cryptography, which is why we should all start using hardware encryption modules (did you know you can use your TPM) and thus in order to save the next girl 6 months of poking around on a piece of hardware she doesn’t really *get*, I started a document: Applied PKCS#11.
The later sections refer to the API exposed by python-pkcs11, but the first part is generally relevant. Hopefully it makes sense, I’m super keen to get feedback if I’ve made any huge logical leaps etc.