def test_ctr_symmetric(self):
for _ in range(100):
pt = urandom(randint(0, 16 * 2))
iv = urandom(4)
ciph = GOST3412Magma(urandom(32))
ct = ctr(ciph.encrypt, 8, pt, iv)
self.assertSequenceEqual(ctr(ciph.encrypt, 8, ct, iv), pt)
def test_ctr_vectors(self):
ciphtext = ""
ciphtext += "f195d8bec10ed1dbd57b5fa240bda1b8"
ciphtext += "85eee733f6a13e5df33ce4b33c45dee4"
ciphtext += "a5eae88be6356ed3d5e877f13564a3a5"
ciphtext += "cb91fab1f20cbab6d1c6d15820bdba73"
iv = self.iv[:8]
self.assertSequenceEqual(
hexenc(ctr(self.ciph.encrypt, 16, hexdec(self.plaintext), iv)),
ciphtext,
)
self.assertSequenceEqual(
hexenc(ctr(self.ciph.encrypt, 16, hexdec(ciphtext), iv)),
self.plaintext,
)
def test_ctr_vectors(self):
ciphtext = ""
ciphtext += "4e98110c97b7b93c"
ciphtext += "3e250d93d6e85d69"
ciphtext += "136d868807b2dbef"
ciphtext += "568eb680ab52a12d"
iv = self.iv[:4]
self.assertSequenceEqual(
hexenc(ctr(self.ciph.encrypt, 8, hexdec(self.plaintext), iv)),
ciphtext,
)
self.assertSequenceEqual(
hexenc(ctr(self.ciph.encrypt, 8, hexdec(ciphtext), iv)),
self.plaintext,
)
def decrypt(self, ctxt):
res = gost3413.ctr(self.enc, self.blen, ctxt, self.iv)
return res
def encrypt(self, text):
res = gost3413.ctr(self.enc, self.blen, text, self.iv)
return res