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DES3.py
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DES3.py
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#this class dael with 3Des decrypt and encryptimport os
from Crypto.Cipher import DES3
from random import SystemRandom
class DES3():
def __init__(self, pasword, data):
self.key = pasword
#check if there is not key
self.data = data
def _make_des3_encryptor(self, iv):
encryptor = DES3.new(self.key, DES3.MODE_CBC, iv)
return encryptor
def des3_encrypt(self):
rand = SystemRandom()
iv = rand.getrandbits(64)
encryptor = self._make_des3_encryptor(self.key, iv)
pad_len = 8 - len(self.data) % 8
#length of padding
padding = chr(pad_len) * pad_len
#PKCS5 padding content
self.data += padding
return encryptor.encrypt(self.data), iv
def des3_decrypt(self, iv):
encryptor = self._make_des3_encryptor(self.key, iv)
result = encryptor.decrypt(self.data)
pad_len = ord(result[-1])
result = result[:-pad_len]
return result