Method decrypt_file

ciphers/xor_cipher.py:158–181

input: filename (str) and a key (int) output: returns true if decrypt process was successful otherwise false if key not passed the method uses the key by the constructor. otherwise key = 1

(self,file, key)

	def decrypt_file(self,file, key):
		"""
			input: filename (str) and a key (int)
			output: returns true if decrypt process was
			successful otherwise false
			if key not passed the method uses the key by the constructor.
			otherwise key = 1
		"""

		#precondition
		assert (isinstance(file,str) and isinstance(key,int))

		try:
			with open(file,"r") as fin:
				with open("decrypt.out","w+") as fout:

					# actual encrypt-process
					for line in fin:
						fout.write(self.decrypt_string(line,key))

		except:
			return False

		return True