code: def get_signatures(self):
          
          signature_expr = re.compile(r"^(META-INF/)(.*)(\.RSA|\.EC|\.DSA)$")
          signature_datas = []
  
          for i in self.get_files():
              if signature_expr.search(i):
                  signature_datas.append(self.get_file(i))
  
          return signature_datas
docs: Return a list of the data of the signature files.
          Only v1 / JAR Signing.
  
          :rtype: list of bytes