type Challenge [32]byte

type EphClaim struct {
	EphID   string          `json:"ephId"`
	EphPK   string          `json:"ephPK"`
	SignAlg EphSigAlgorithm `json:"signAlg"`
	Expiry  uint64          `json:"expiry"`
}

type EphSigAlgorithm string

type FinalChallengeHex string

type UserAuthId string

type UserAuthMethod string

type UserAuthentication struct {
	// Credentials contains signing information required for verification.
	Credentials UserCredentials `json:"credentials"`

	// Signature is a signature according to credentials.
	Signature string `json:"signature"`
}

type UserCredentials struct {
	// ID is an arbitrary ID of the signature among passed from a user to a verifier.
	ID string `json:"id"`

	// Method defines the format of the credentials field.
	Method UserAuthMethod `json:"method"`

	// Credentials contains public key or a more complex structure required to verify a signature.
	Credentials string `json:"credentials"`
}

type UserSignatures map[UserAuthId]UserAuthentication