from functools import partial
-from pygost.gost3413 import pad1
from pygost.gost3413 import pad2
+from pygost.gost3413 import pad_size
from pygost.utils import hexdec
from pygost.utils import strxor
from pygost.utils import xrange # pylint: disable=redefined-builtin
if not data:
raise ValueError("No data supplied")
n2, n1 = encrypt(sbox, key, block2ns(iv))
- size = len(data)
- data = pad1(data, BLOCKSIZE)
gamma = []
- for _ in xrange(0, len(data), BLOCKSIZE):
+ for _ in xrange(0, len(data) + pad_size(len(data), BLOCKSIZE), BLOCKSIZE):
n1 = addmod(n1, C2, 2 ** 32)
n2 = addmod(n2, C1, 2 ** 32 - 1)
gamma.append(ns2block(encrypt(sbox, key, (n1, n2))))
- return strxor(b"".join(gamma), data[:size])
+ return strxor(b"".join(gamma), data)
MESH_CONST = hexdec("6900722264C904238D3ADB9646E92AC418FEAC9400ED0712C086DCC2EF4CA92B")
validate_sbox(sbox)
if not data:
raise ValueError("No data supplied")
- size = len(data)
- data = pad1(data, BLOCKSIZE)
ciphertext = [iv]
- for i in xrange(0, len(data), BLOCKSIZE):
+ for i in xrange(0, len(data) + pad_size(len(data), BLOCKSIZE), BLOCKSIZE):
if mesh and i >= MESH_MAX_DATA and i % MESH_MAX_DATA == 0:
key, iv = meshing(key, ciphertext[-1], sbox=sbox)
ciphertext.append(strxor(
data[i:i + BLOCKSIZE],
ns2block(encrypt(sbox, key, block2ns(ciphertext[-1]))),
))
- return b"".join(ciphertext[1:])[:size]
+ return b"".join(ciphertext[1:])
def cfb_decrypt(key, data, iv=8 * b"\x00", sbox=DEFAULT_SBOX, mesh=False):
validate_sbox(sbox)
if not data:
raise ValueError("No data supplied")
- size = len(data)
- data = pad1(data, BLOCKSIZE)
plaintext = []
data = iv + data
- for i in xrange(BLOCKSIZE, len(data), BLOCKSIZE):
+ for i in xrange(BLOCKSIZE, len(data) + pad_size(len(data), BLOCKSIZE), BLOCKSIZE):
if (
mesh and
(i - BLOCKSIZE) >= MESH_MAX_DATA and
data[i:i + BLOCKSIZE],
ns2block(encrypt(sbox, key, block2ns(data[i - BLOCKSIZE:i]))),
))
- return b"".join(plaintext)[:size]
+ return b"".join(plaintext)