COSE cryptographic algorithms - message authentication codes

[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 MAC algorithms that we intend to support.

• HMAC (Add COSE structure extensions that allow use of predefined cryptographic backends + an OpenSSL based backend. #13)
  • HMAC 256/64
  • HMAC 256/256 (Add COSE structure extensions that allow use of predefined cryptographic backends + an OpenSSL based backend. #13)
  • HMAC 384/384 (Add COSE structure extensions that allow use of predefined cryptographic backends + an OpenSSL based backend. #13)
  • HMAC 512/512 (Add COSE structure extensions that allow use of predefined cryptographic backends + an OpenSSL based backend. #13)
• AES-CBC-MAC
  • AES-MAC 128/64
  • AES-MAC 256/64
  • AES-MAC 128/128
  • AES-MAC 256/128