Type holds the type of crypto algorithm used.

GetKeyInfoResponse returns the public key, the role, and the algorithm and key ID.

KeyID holds an ID that is used to reference the key.

KeyInfo holds a KeyID that is used to reference the key and it's algorithm.

PublicKey has a KeyInfo that is used to reference the key, and opaque bytes of a publicKey.

Signature specifies a KeyInfo that was used for signing and signed content.

SignatureRequests specifies a KeyInfo, and content to be signed.

Void represents an empty message type.