Add explicit ALgorithmIdentifiers of component keys.

[janklaussner]

No description provided.

[janklaussner]

Question to group: for RSA key AlgIds it is possible to be very specific on its usage. Do we want/need this?

[ounsworth]

This does not yet provide an encoding of OAEP parameters. We need to address that before merging.

Update: Just need John to provide a DER encoding of the RSA-OAEP params.

[janklaussner]

@ounsworth , @johngray-dev : added DER encoding and some places where RSA 4096 combo was missing... I assumed that the OAEP params for RSA 4096 are the same as for RSA 2048

[ounsworth]

Thanks Jan! I'm going to merge this now.

[ounsworth]

@janklaussner your DER encoding of the RSA-OAEP AlgID had an extra NULL at the end that John and I couldn't figure out, so I replaced it with a DER encoding produced by our toolkit.