def decrypt(stream, parameters):
 encodedStream = ''
 if ((parameters == None) or (parameters == {})):
  return (0, stream)
 elif ((not parameters.has_key('/Name')) or (parameters['/Name'] == None)):
  return (0, stream)
 else:
  cryptFilterName = parameters['/Name'].getValue()
  if (cryptFilterName == 'Identity'):
   return (0, stream)
  else:
   return ((-1), 'Decrypt not supported yet')

def decrypt ( stream , parameters ) : encodedStream = '' if ( ( parameters == None ) or ( parameters == { } ) ) : return ( 0 , stream ) elif ( ( not parameters . has_key ( '/Name' ) ) or ( parameters [ '/Name' ] == None ) ) : return ( 0 , stream ) else : cryptFilterName = parameters [ '/Name' ] . getValue ( ) if ( cryptFilterName == 'Identity' ) : return ( 0 , stream ) else : return ( ( - 1 ) , 'Decrypt not supported yet' )
decrypt ciphertext .