# Author: Trevor Perrin
# See the LICENSE file for legal information regarding use of this file.
"""Abstract class for 3DES."""
[docs]
class TripleDES(object):
[docs]
def __init__(self, key, mode, IV, implementation):
if len(key) != 24:
raise ValueError()
if mode != 2:
raise ValueError()
if len(IV) != 8:
raise ValueError()
self.isBlockCipher = True
self.isAEAD = False
self.block_size = 8
self.implementation = implementation
self.name = "3des"
#CBC-Mode encryption, returns ciphertext
#WARNING: *MAY* modify the input as well
[docs]
def encrypt(self, plaintext):
assert(len(plaintext) % 8 == 0)
#CBC-Mode decryption, returns plaintext
#WARNING: *MAY* modify the input as well
[docs]
def decrypt(self, ciphertext):
assert(len(ciphertext) % 8 == 0)