result = []
for i in xrange(0, len(data) + pad_size(len(data), bs), bs):
r = r[1:] + [encrypter(r[0])]
- result.append(strxor(r[1], data[i:i + bs]))
+ result.append(strxor(r[-1], data[i:i + bs]))
return b"".join(result)
from pygost.gost3413 import unpad2
from pygost.utils import hexdec
from pygost.utils import hexenc
+from pygost.utils import strxor
class Pad2Test(TestCase):
ct = ofb(ciph.encrypt, 16, pt, iv)
self.assertSequenceEqual(ofb(ciph.encrypt, 16, ct, iv), pt)
+ def test_ofb_manual(self):
+ iv = [urandom(16) for _ in range(randint(2, 10))]
+ pt = [urandom(16) for _ in range(len(iv), len(iv) + randint(1, 10))]
+ ciph = GOST3412Kuznechik(urandom(32))
+ r = [ciph.encrypt(i) for i in iv]
+ for i in range(len(pt) - len(iv)):
+ r.append(ciph.encrypt(r[i]))
+ ct = [strxor(g, r) for g, r in zip(pt, r)]
+ self.assertSequenceEqual(
+ ofb(ciph.encrypt, 16, b"".join(pt), b"".join(iv)),
+ b"".join(ct),
+ )
+
def test_cbc_vectors(self):
ciphtext = ""
ciphtext += "689972d4a085fa4d90e52e3d6d7dcc27"