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§cosey
Data types and serde for public COSE_Keys
https://tools.ietf.org/html/rfc8152#section-7
A COSE Key structure is built on a CBOR map object. The set of common parameters that can appear in a COSE Key can be found in the IANA “COSE Key Common Parameters” registry (Section 16.5).
https://www.iana.org/assignments/cose/cose.xhtml#key-common-parameters
Additional parameters defined for specific key types can be found in the IANA “COSE Key Type Parameters” registry (Section 16.6).
https://www.iana.org/assignments/cose/cose.xhtml#key-type-parameters
Key Type 1 (OKP) -1: crv -2: x (x-coordinate) -4: d (private key)
Key Type 2 (EC2) -1: crv -2: x (x-coordinate) -3: y (y-coordinate) -4: d (private key)
Key Type 4 (Symmetric) -1: k (key value)