Package tlslite :: Package utils :: Module tripledes
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Source Code for Module tlslite.utils.tripledes

 1  # Author: Trevor Perrin 
 2  # See the LICENSE file for legal information regarding use of this file. 
 3   
 4  """Abstract class for 3DES.""" 
 5   
6 -class TripleDES:
7 - def __init__(self, key, mode, IV, implementation):
8 if len(key) != 24: 9 raise ValueError() 10 if mode != 2: 11 raise ValueError() 12 if len(IV) != 8: 13 raise ValueError() 14 self.isBlockCipher = True 15 self.block_size = 8 16 self.implementation = implementation 17 self.name = "3des"
18 19 #CBC-Mode encryption, returns ciphertext 20 #WARNING: *MAY* modify the input as well
21 - def encrypt(self, plaintext):
22 assert(len(plaintext) % 8 == 0)
23 24 #CBC-Mode decryption, returns plaintext 25 #WARNING: *MAY* modify the input as well
26 - def decrypt(self, ciphertext):
27 assert(len(ciphertext) % 8 == 0)
28