20240604 506 create loaded #529
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Fixes #506
Start on created loaded.
Create loaded appears to work in the base case, but when using it for key derivation, it appears to be failing with:
I'm pretty sure I'm making a mistake in the derive_parent_public PublicBuilder parameters that I'm setting. Per the spec, this does need to be keyed hash, but I think given the parameters I've set, I think that we need to set the KDF1SP800_108 as the scheme when we create this key - currently though I think that's not possible as KeyHashSchemes are just for Xor and Hmac, not derivation.
So any advice would be more than welcome on how to proceed next :)