| """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) |
