code: def get_xmlsec_binary(paths=None):
      
      if os.name == 'posix':
          bin_name = ['xmlsec1']
      elif os.name == 'nt':
          bin_name = ['xmlsec.exe', 'xmlsec1.exe']
      else:  # Default !?
          bin_name = ['xmlsec1']
  
      if paths:
          for bname in bin_name:
              for path in paths:
                  fil = os.path.join(path, bname)
                  try:
                      if os.lstat(fil):
                          return fil
                  except OSError:
                      pass
  
      for path in os.environ['PATH'].split(os.pathsep):
          for bname in bin_name:
              fil = os.path.join(path, bname)
              try:
                  if os.lstat(fil):
                      return fil
              except OSError:
                  pass
  
      raise SigverError('Cannot find {binary}'.format(binary=bin_name))
docs: Tries to find the xmlsec1 binary.
  
      :param paths: Non-system path paths which should be searched when
          looking for xmlsec1
      :return: full name of the xmlsec1 binary found. If no binaries are
          found then an exception is raised.