def test_double():
a = b"hello"
b = enpad(a,16)
c = enpad(b,16)
d = unpad(c,16)
assert b==d
e = unpad(d,16)
assert a==e
def encrypt(self,plaintext,nonce):
if len(nonce)!=self.NONCE_SIZE:
raise ValueError("nonce must be exactly {0:d} bytes long (not {1:d})"
.format(self.NONCE_SIZE,len(nonce)))
c = self._cipher.new(self.__key,self._cipher.MODE_CBC,nonce)
ct = c.encrypt(enpad(plaintext,c.block_size))
return nonce+ct+self._getmac(nonce,ct)
def encrypt(self, plaintext, nonce):
if len(nonce) != self.NONCE_SIZE:
raise ValueError(
"nonce must be exactly {0:d} bytes long (not {1:d})".format(
self.NONCE_SIZE, len(nonce)))
c = self._cipher.new(self.__key, self._cipher.MODE_CBC, nonce)
ct = c.encrypt(enpad(plaintext, c.block_size))
return nonce + ct + self._getmac(nonce, ct)
def check_pad(text,bs):
p = enpad(text,bs)
u = unpad(p,bs)
assert (len(p)%bs)==0
assert u == text