NewHMacSigner instantiates a signer using HMAC using SHA-512 with the given private key.

NewRandomRSAKey generates a public/private key pair.

NewSigner instantiate a signer using RSASSA-PSS (SHA512) with the given private key.

Sign a json marshalled content and returns a protected JWS object using the full serialization format.

Verify parses the serialized, protected JWS object, than verifying the signature on the payload and unmarshal the payload into i.