feat: external signature suite provider interface #2835
Merged
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This PR adds a pluggable component enabling usage of an externally provided signature suite. This is a refinement on previous attempts to make this aspect of ACA-Py more flexible; namely, #2706 which was later reverted due to issues with including profile in the context and multi-tenancy. This approach minimizes the "surface area" of the interface that the plugin must fulfill (at least when compared to what was proposed in #2706).
This is an advanced use case requiring some fairly deep knowledge of the management of DIDs and VCs. I have an example implementation of using an external KMS for signing JSON-LD creds that can be found here: https://github.com/dbluhm/acapy-ld-signer