anchor.diff:      '';
   
       ecdsa = mkPrefixedAttrsOfParams {
  -      file = mkPrefixedAttrsOfParam (mkOptionalStrParam "") ''
  +      file = mkOptionalStrParam ''
           File name in the <literal>ecdsa</literal> folder for which this
           passphrase should be used.
         '';
  
positive.code:     '';
  
      private = mkPrefixedAttrsOfParams {
        file = mkPrefixedAttrsOfParam (mkOptionalStrParam "") ''
          File name in the private folder for which this passphrase should be used.
        '';
  
  
negative.code:     '';
  
      rsa = mkPrefixedAttrsOfParams {
        file = mkOptionalStrParam ''
          File name in the <literal>rsa</literal> folder for which this passphrase
          should be used.
        '';
  