verify

var (
	ErrMissingKey       = errors.New("tuf: missing key")
	ErrNoSignatures     = errors.New("tuf: data has no signatures")
	ErrInvalid          = errors.New("tuf: signature verification failed")
	ErrWrongMethod      = errors.New("tuf: invalid signature type")
	ErrUnknownRole      = errors.New("tuf: unknown role")
	ErrRoleThreshold    = errors.New("tuf: valid signatures did not meet threshold")
	ErrWrongMetaType    = errors.New("tuf: meta file has wrong type")
	ErrExists           = errors.New("tuf: key already in db")
	ErrWrongID          = errors.New("tuf: key id mismatch")
	ErrInvalidKey       = errors.New("tuf: invalid key")
	ErrInvalidRole      = errors.New("tuf: invalid role")
	ErrInvalidKeyID     = errors.New("tuf: invalid key id")
	ErrInvalidThreshold = errors.New("tuf: invalid role threshold")
)

var IsExpired = func(t time.Time) bool {
	return t.Sub(time.Now()) <= 0
}

var Verifiers = map[string]Verifier{
	data.KeyTypeEd25519:         ed25519Verifier{},
	data.KeyTypeECDSA_SHA2_P256: p256Verifier{},
}