Implement COSE Signing, IETF RFC 8152, section 4

Minimum Viable Product - Single Signer

• Read and expose metadata for tagged and untagged COSE_Sign1 messages
• Validate signature with both embedded and detached content, from both formats.
  • ECDsa
  • RSASSA-PSS (from IETF RFC 8230)
• Create new embedded- and detached- content signature.

This minimum viable product can be shipped as a NuGet package for verification by early adopters before continuing into the multiple signers scope.

Things that won't be covered on the MVP:

• Validation of Critical headers
• A model to interact with Counter Signatures headers.