COSE cryptographic algorithms - content encryption algorithms

[pulsastrix]

#13 only adds a minimum subset of cryptographic algorithms for COSE structures.
The available algorithms should be expanded.

This issue lists the progress on the content encryption algorithms that we intend to support.

• AES-GCM (Add COSE structure extensions that allow use of predefined cryptographic backends + an OpenSSL based backend. #13)
  • A128GCM (Add COSE structure extensions that allow use of predefined cryptographic backends + an OpenSSL based backend. #13)
  • A192GCM (Add COSE structure extensions that allow use of predefined cryptographic backends + an OpenSSL based backend. #13)
  • A256GCM (Add COSE structure extensions that allow use of predefined cryptographic backends + an OpenSSL based backend. #13)
• AES-CCM (Add support for AES-CCM #24)
  • AES-CCM-16-64-128 (Add support for AES-CCM #24)
  • AES-CCM-16-64-256 (Add support for AES-CCM #24)
  • AES-CCM-64-64-128 (Add support for AES-CCM #24)
  • AES-CCM-64-64-256 (Add support for AES-CCM #24)
  • AES-CCM-16-128-128 (Add support for AES-CCM #24)
  • AES-CCM-16-128-256 (Add support for AES-CCM #24)
  • AES-CCM-64-128-128 (Add support for AES-CCM #24)
  • AES-CCM-64-128-256 (Add support for AES-CCM #24)
• ChaCha20/Poly1305 (Add support for ChaCha20/Poly1305 #26)