def encrypt(self, plaintext):
assert(len(plaintext) % 16 == 0)
context = self._createContext(1)
ciphertext = m2.cipher_update(context, plaintext)
m2.cipher_ctx_free(context)
self.IV = ciphertext[-self.block_size:]
return bytearray(ciphertext)
def encrypt(self, plaintext):
assert(len(plaintext) % 8 == 0)
if not plaintext:
return ''
context = self._createContext(1)
ciphertext = m2.cipher_update(context, plaintext)
m2.cipher_ctx_free(context)
self.IV = ciphertext[-self.block_size:]
return ciphertext
def encrypt(self, plaintext):
assert (len(plaintext) % 8 == 0)
if not plaintext:
return ''
context = self._createContext(1)
ciphertext = m2.cipher_update(context, plaintext)
m2.cipher_ctx_free(context)
self.IV = ciphertext[-self.block_size:]
return ciphertext
def decrypt(self, ciphertext):
assert(len(ciphertext) % 16 == 0)
context = self._createContext(0)
#I think M2Crypto has a bug - it fails to decrypt and return the last block passed in.
#To work around this, we append sixteen zeros to the string, below:
plaintext = m2.cipher_update(context, ciphertext+('\0'*16))
#If this bug is ever fixed, then plaintext will end up having a garbage
#plaintext block on the end. That's okay - the below code will discard it.
plaintext = plaintext[:len(ciphertext)]
m2.cipher_ctx_free(context)
self.IV = ciphertext[-self.block_size:]
return bytearray(plaintext)
def update(self, data):
# type: (bytes) -> bytes
return m2.cipher_update(self.ctx, data)
def update(self, data):
return m2.cipher_update(self.ctx, data)
def update(self, data):
# type: (bytes) -> bytes
return m2.cipher_update(self.ctx, data)