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"""Abstract class for 3DES."""
from compat import * #For True
class TripleDES:
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.block_size = 8
self.implementation = implementation
self.name = "3des"
#CBC-Mode encryption, returns ciphertext
#WARNING: *MAY* modify the input as well
def encrypt(self, plaintext):
assert(len(plaintext) % 8 == 0)
#CBC-Mode decryption, returns plaintext
#WARNING: *MAY* modify the input as well
def decrypt(self, ciphertext):
assert(len(ciphertext) % 8 == 0)
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