code: func (s PrefixSecret) Validate() error {
  	if len(s) != PrefixSecretLength {
  		return fmt.Errorf("invalid prefix secret length (%d != %d)", len(s), PrefixSecretLength)
  	}
  	return nil
  }
docs: // Validate confirms that this prefix secret is conformant.
  //
  // Note that this does not scan the byte contents of the secret for any
  // security-related parameters.