Module refinery.units.crypto.cipher.gost

Classes

class SBOX (value, names=None, *, module=None, qualname=None, type=None, start=1)

An enumeration.

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class SBOX(tuple, Enum):
    CBR = (
        0x4, 0xA, 0x9, 0x2, 0xD, 0x8, 0x0, 0xE, 0x6, 0xB, 0x1, 0xC, 0x7, 0xF, 0x5, 0x3,
        0xE, 0xB, 0x4, 0xC, 0x6, 0xD, 0xF, 0xA, 0x2, 0x3, 0x8, 0x1, 0x0, 0x7, 0x5, 0x9,
        0x5, 0x8, 0x1, 0xD, 0xA, 0x3, 0x4, 0x2, 0xE, 0xF, 0xC, 0x7, 0x6, 0x0, 0x9, 0xB,
        0x7, 0xD, 0xA, 0x1, 0x0, 0x8, 0x9, 0xF, 0xE, 0x4, 0x6, 0xC, 0xB, 0x2, 0x5, 0x3,
        0x6, 0xC, 0x7, 0x1, 0x5, 0xF, 0xD, 0x8, 0x4, 0xA, 0x9, 0xE, 0x0, 0x3, 0xB, 0x2,
        0x4, 0xB, 0xA, 0x0, 0x7, 0x2, 0x1, 0xD, 0x3, 0x6, 0x8, 0x5, 0x9, 0xC, 0xF, 0xE,
        0xD, 0xB, 0x4, 0x1, 0x3, 0xF, 0x5, 0x9, 0x0, 0xA, 0xE, 0x7, 0x6, 0x8, 0x2, 0xC,
        0x1, 0xF, 0xD, 0x0, 0x5, 0x7, 0xA, 0x4, 0x9, 0x2, 0x3, 0xE, 0x6, 0xB, 0x8, 0xC,
    )
    R34 = (  # R 34.12.2015
        0xC, 0x4, 0x6, 0x2, 0xA, 0x5, 0xB, 0x9, 0xE, 0x8, 0xD, 0x7, 0x0, 0x3, 0xF, 0x1,
        0x6, 0x8, 0x2, 0x3, 0x9, 0xA, 0x5, 0xC, 0x1, 0xE, 0x4, 0x7, 0xB, 0xD, 0x0, 0xF,
        0xB, 0x3, 0x5, 0x8, 0x2, 0xF, 0xA, 0xD, 0xE, 0x1, 0x7, 0x4, 0xC, 0x9, 0x6, 0x0,
        0xC, 0x8, 0x2, 0x1, 0xD, 0x4, 0xF, 0x6, 0x7, 0x0, 0xA, 0x5, 0x3, 0xE, 0x9, 0xB,
        0x7, 0xF, 0x5, 0xA, 0x8, 0x1, 0x6, 0xD, 0x0, 0x9, 0x3, 0xE, 0xB, 0x4, 0x2, 0xC,
        0x5, 0xD, 0xF, 0x6, 0x9, 0x2, 0xC, 0xA, 0xB, 0x7, 0x8, 0x1, 0x4, 0x3, 0xE, 0x0,
        0x8, 0xE, 0x2, 0x5, 0x6, 0x9, 0x1, 0xC, 0xF, 0x4, 0xB, 0x0, 0xD, 0xA, 0x3, 0x7,
        0x1, 0x7, 0xE, 0xD, 0x0, 0x5, 0x8, 0x3, 0x4, 0xF, 0xA, 0x6, 0x9, 0xC, 0xB, 0x2,
    )

    def expand(self):
        result = []
        sbox = self.value
        for i in range(4):
            row = []
            for j in range(0x100):
                q, r = divmod(j, 0x10)
                r += (2 * i + 0) * 16
                q += (2 * i + 1) * 16
                t = sbox[r] | (sbox[q] << 4)
                row.append(rotl32(t, (11 + 8 * i) % 32))
            result.append(row)
        return result

Ancestors

• builtins.tuple
• enum.Enum

Class variables

var CBR

var R34

Methods

def expand(self)

Expand source code Browse git

def expand(self):
    result = []
    sbox = self.value
    for i in range(4):
        row = []
        for j in range(0x100):
            q, r = divmod(j, 0x10)
            r += (2 * i + 0) * 16
            q += (2 * i + 1) * 16
            t = sbox[r] | (sbox[q] << 4)
            row.append(rotl32(t, (11 + 8 * i) % 32))
        result.append(row)
    return result

class GOST (key, mode, swap=False, sbox=SBOX.R34)

Helper class that provides a standard way to create an ABC using inheritance.

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class GOST(BlockCipher):

    _key_data: List[int]

    block_size = 8
    key_size = frozenset({32})

    def __init__(self, key: BufferType, mode: Optional[CipherMode], swap: bool = False, sbox: SBOX = SBOX.R34):
        self.swap = swap

        sbox = sbox.expand()
        S1, S2, S3, S4 = sbox

        def F(A: int, K: int, swap: bool = False):
            T = A + K & 0xFFFFFFFF
            v1, v2, v3, v4 = T.to_bytes(4, 'little')
            return S1[v1] ^ S2[v2] ^ S3[v3] ^ S4[v4]

        self.F = F

        super().__init__(key, mode)

    def block_decrypt(self, block) -> BufferType:
        A, B = chunks.unpack(block, 4, self.swap)
        F = self.F
        K = self._key_data
        for i in range(8):
            B, A = A, B ^ F(A, K[i])
        for i in range(24 - 1, -1, -1):
            B, A = A, B ^ F(A, K[i % 8])
        return chunks.pack((B, A), 4, self.swap)

    def block_encrypt(self, block) -> BufferType:
        A, B = chunks.unpack(block, 4, self.swap)
        F = self.F
        K = self._key_data
        for i in range(24):
            B, A = A, B ^ F(A, K[i % 8])
        for i in range(8 - 1, -1, -1):
            B, A = A, B ^ F(A, K[i])
        return chunks.pack((B, A), 4, self.swap)

    @property
    def key(self):
        return self._key_data

    @key.setter
    def key(self, key: bytes):
        self._key_data = chunks.unpack(key, 4, self.swap)

Ancestors

• BlockCipher
• CipherInterface
• abc.ABC

Class variables

var block_size

var key_size

Instance variables

var key

Expand source code Browse git

@property
def key(self):
    return self._key_data

Methods

def block_decrypt(self, block)

Expand source code Browse git

def block_decrypt(self, block) -> BufferType:
    A, B = chunks.unpack(block, 4, self.swap)
    F = self.F
    K = self._key_data
    for i in range(8):
        B, A = A, B ^ F(A, K[i])
    for i in range(24 - 1, -1, -1):
        B, A = A, B ^ F(A, K[i % 8])
    return chunks.pack((B, A), 4, self.swap)

def block_encrypt(self, block)

Expand source code Browse git

def block_encrypt(self, block) -> BufferType:
    A, B = chunks.unpack(block, 4, self.swap)
    F = self.F
    K = self._key_data
    for i in range(24):
        B, A = A, B ^ F(A, K[i % 8])
    for i in range(8 - 1, -1, -1):
        B, A = A, B ^ F(A, K[i])
    return chunks.pack((B, A), 4, self.swap)

class gost (key, iv=b'', padding=None, mode=None, raw=False, swap=False, sbox=SBOX.R34, *, assoc_len=0, mac_len=0, segment_size=0, little_endian=False)

GOST encryption and decryption.

Expand source code Browse git

class gost(StandardBlockCipherUnit, cipher=BlockCipherFactory(GOST)):
    """
    GOST encryption and decryption.
    """
    def __init__(
        self, key, iv=B'', padding=None, mode=None, raw=False,
        swap: Arg.Switch('-s', help='Decode blocks as big endian rather than little endian.') = False,
        sbox: Arg.Option('-x', choices=SBOX, help=(
            'Choose an SBOX. The default is {default}, which corresponds to the R-34.12.2015 standard. '
            'The other option is CBR, which is the SBOX used by the Central Bank of Russia.'
        )) = SBOX.R34, **more
    ):
        sbox = Arg.AsOption(sbox, SBOX)
        super().__init__(key, iv, padding=padding, mode=mode, raw=raw, swap=swap, sbox=sbox, **more)

    def _new_cipher(self, **optionals) -> CipherInterface:
        return super()._new_cipher(
            swap=self.args.swap,
            sbox=self.args.sbox,
            **optionals
        )

Ancestors

• StandardBlockCipherUnit
• BlockCipherUnitBase
• StandardCipherUnit
• CipherUnit
• Unit
• UnitBase
• Entry

Class variables

var block_size

var key_size

Inherited members

• StandardBlockCipherUnit:
  • Arg
  • assemble
  • filter
  • finish
  • handles
  • labelled
  • log_debug
  • log_detach
  • log_fail
  • log_info
  • log_level
  • log_warn
  • nozzle
  • process
  • read
  • read1
  • reverse
  • run
  • source
  • superinit