Python:MD 5暗号化とファイル生成MD 5値

import hashlib
 
class Md5_enc():
    def __init__(self,key="cxj"):
        self.key = key
        self.maker = hashlib.md5()
 
    def md5_str(self,message):
        self.maker.update(bytes(self.key, encoding="utf-8"))
        self.maker.update(bytes(message,encoding="utf-8"))
        rel = self.maker.hexdigest()
        self.maker = hashlib.md5()
        return rel
 
    def md5_file(self,filehandle):
        while True:
            tmp_data = filehandle.read(10240)
            if not tmp_data:
                break
            self.maker.update(tmp_data)
        rel = self.maker.hexdigest()
        self.maker = hashlib.md5()
        return rel