class DES:
def __init__(self, key_size, blocklength):
if key_size != 64:
raise InvalidKeyLength("Keylength of DES must be 64 bits!")
if blocklength % 64 != 0:
raise InvalidCipherBlockLength(
"Blocklength of DES should be multiplier of 64")
self._key = None
self._blocklength = blocklength
def set_key(self, key):
string_key = bits_to_bytes(key)
self._key = DesKey(string_key)
if not self._key.is_single():
raise WrongConfiguration("3DES has been configured")
def encrypt(self, message):
byte_message = bits_to_bytes(message)
encrypted_bytes = None
for _ in range(round(self._blocklength / 64)):
encrypted_bytes = self._key.encrypt(byte_message)
return bytes_to_bits(encrypted_bytes)
def decrypt(self, message):
byte_message = bits_to_bytes(message)
decrypted_bytes = None
for _ in range(round(self._blocklength / 64)):
decrypted_bytes = self._key.decrypt(byte_message)
return bytes_to_bits(decrypted_bytes)
class DES_Crypt():
def __init__(self, key: str, text: str):
"""
:key: private key, will be encoded into bytes
:text: plaintext, will be encoded into bytes
"""
self.key = DesKey(bytes(key.encode('utf-8')))
self.text = bytes(text.encode('utf-8'))
@MyTools.info("T encrypt")
def encrypt(self):
self.encrypted = self.key.encrypt(self.text, padding=True)
return self.encrypted
@MyTools.info("T decrypt")
def decrypt(self):
self.decrypted = self.key.decrypt(self.encrypted, padding=True)
return self.decrypted
def is_single(self):
return self.key.is_single()
#!/usr/bin/python
from des import DesKey
key0 = DesKey("hsueo se") # FOR DES
key1 = DesKey(
"a key for TRIPLE") # for 3DES, same as "a key for TRIPLEa key for"
key2 = DesKey("a 24-byte key for TRIPLE") # for 3DES
key3 = DesKey("12345678REAL_KEY") # for DES, same as "REAL_KEY"
key0.is_single()
key1.is_triple()
key2.is_single()
key3.is_triple()
enc = key0.encrypt("any long message")
print enc