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Nama	Ukuran	Aksi
asymmetric	-	Open
ciphers	-	Open
kdf	-	Open
serialization	-	Open
twofactor	-	Open
__pycache__	-	Open
cmac.py	1.78 MB	View DL Edit
constant_time.py	387 B	View DL Edit
hashes.py	5.82 MB	View DL Edit
hmac.py	1.98 MB	View DL Edit
keywrap.py	5.61 MB	View DL Edit
padding.py	6.04 MB	View DL Edit
poly1305.py	1.67 MB	View DL Edit
_asymmetric.py	485 B	View DL Edit
_cipheralgorithm.py	1000 B	View DL Edit
_serialization.py	1.31 MB	View DL Edit
__init__.py	180 B	View DL Edit

Edit file: /usr/lib64/python3.9/site-packages/cryptography/hazmat/primitives/keywrap.py

# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

import struct
import typing

from cryptography.hazmat.primitives.ciphers import Cipher
from cryptography.hazmat.primitives.ciphers.algorithms import AES
from cryptography.hazmat.primitives.ciphers.modes import ECB
from cryptography.hazmat.primitives.constant_time import bytes_eq

def _wrap_core(
    wrapping_key: bytes,
    a: bytes,
    r: typing.List[bytes],
) -> bytes:
    # RFC 3394 Key Wrap - 2.2.1 (index method)
    encryptor = Cipher(AES(wrapping_key), ECB()).encryptor()
    n = len(r)
    for j in range(6):
        for i in range(n):
            # every encryption operation is a discrete 16 byte chunk (because
            # AES has a 128-bit block size) and since we're using ECB it is
            # safe to reuse the encryptor for the entire operation
            b = encryptor.update(a + r[i])
            # pack/unpack are safe as these are always 64-bit chunks
            a = struct.pack(
                ">Q", struct.unpack(">Q", b[:8])[0] ^ ((n * j) + i + 1)
            )
            r[i] = b[-8:]

assert encryptor.finalize() == b""

return a + b"".join(r)

def aes_key_wrap(
    wrapping_key: bytes,
    key_to_wrap: bytes,
    backend: typing.Any = None,
) -> bytes:
    if len(wrapping_key) not in [16, 24, 32]:
        raise ValueError("The wrapping key must be a valid AES key length")

if len(key_to_wrap) < 16:
        raise ValueError("The key to wrap must be at least 16 bytes")

if len(key_to_wrap) % 8 != 0:
        raise ValueError("The key to wrap must be a multiple of 8 bytes")

a = b"\xa6\xa6\xa6\xa6\xa6\xa6\xa6\xa6"
    r = [key_to_wrap[i : i + 8] for i in range(0, len(key_to_wrap), 8)]
    return _wrap_core(wrapping_key, a, r)

def _unwrap_core(
    wrapping_key: bytes,
    a: bytes,
    r: typing.List[bytes],
) -> typing.Tuple[bytes, typing.List[bytes]]:
    # Implement RFC 3394 Key Unwrap - 2.2.2 (index method)
    decryptor = Cipher(AES(wrapping_key), ECB()).decryptor()
    n = len(r)
    for j in reversed(range(6)):
        for i in reversed(range(n)):
            # pack/unpack are safe as these are always 64-bit chunks
            atr = (
                struct.pack(
                    ">Q", struct.unpack(">Q", a)[0] ^ ((n * j) + i + 1)
                )
                + r[i]
            )
            # every decryption operation is a discrete 16 byte chunk so
            # it is safe to reuse the decryptor for the entire operation
            b = decryptor.update(atr)
            a = b[:8]
            r[i] = b[-8:]

assert decryptor.finalize() == b""
    return a, r

def aes_key_wrap_with_padding(
    wrapping_key: bytes,
    key_to_wrap: bytes,
    backend: typing.Any = None,
) -> bytes:
    if len(wrapping_key) not in [16, 24, 32]:
        raise ValueError("The wrapping key must be a valid AES key length")

aiv = b"\xA6\x59\x59\xA6" + struct.pack(">i", len(key_to_wrap))
    # pad the key to wrap if necessary
    pad = (8 - (len(key_to_wrap) % 8)) % 8
    key_to_wrap = key_to_wrap + b"\x00" * pad
    if len(key_to_wrap) == 8:
        # RFC 5649 - 4.1 - exactly 8 octets after padding
        encryptor = Cipher(AES(wrapping_key), ECB()).encryptor()
        b = encryptor.update(aiv + key_to_wrap)
        assert encryptor.finalize() == b""
        return b
    else:
        r = [key_to_wrap[i : i + 8] for i in range(0, len(key_to_wrap), 8)]
        return _wrap_core(wrapping_key, aiv, r)

def aes_key_unwrap_with_padding(
    wrapping_key: bytes,
    wrapped_key: bytes,
    backend: typing.Any = None,
) -> bytes:
    if len(wrapped_key) < 16:
        raise InvalidUnwrap("Must be at least 16 bytes")

if len(wrapping_key) not in [16, 24, 32]:
        raise ValueError("The wrapping key must be a valid AES key length")

if len(wrapped_key) == 16:
        # RFC 5649 - 4.2 - exactly two 64-bit blocks
        decryptor = Cipher(AES(wrapping_key), ECB()).decryptor()
        b = decryptor.update(wrapped_key)
        assert decryptor.finalize() == b""
        a = b[:8]
        data = b[8:]
        n = 1
    else:
        r = [wrapped_key[i : i + 8] for i in range(0, len(wrapped_key), 8)]
        encrypted_aiv = r.pop(0)
        n = len(r)
        a, r = _unwrap_core(wrapping_key, encrypted_aiv, r)
        data = b"".join(r)

# 1) Check that MSB(32,A) = A65959A6.
    # 2) Check that 8*(n-1) < LSB(32,A) <= 8*n.  If so, let
    #    MLI = LSB(32,A).
    # 3) Let b = (8*n)-MLI, and then check that the rightmost b octets of
    #    the output data are zero.
    (mli,) = struct.unpack(">I", a[4:])
    b = (8 * n) - mli
    if (
        not bytes_eq(a[:4], b"\xa6\x59\x59\xa6")
        or not 8 * (n - 1) < mli <= 8 * n
        or (b != 0 and not bytes_eq(data[-b:], b"\x00" * b))
    ):
        raise InvalidUnwrap()

if b == 0:
        return data
    else:
        return data[:-b]

def aes_key_unwrap(
    wrapping_key: bytes,
    wrapped_key: bytes,
    backend: typing.Any = None,
) -> bytes:
    if len(wrapped_key) < 24:
        raise InvalidUnwrap("Must be at least 24 bytes")

if len(wrapped_key) % 8 != 0:
        raise InvalidUnwrap("The wrapped key must be a multiple of 8 bytes")

if len(wrapping_key) not in [16, 24, 32]:
        raise ValueError("The wrapping key must be a valid AES key length")

aiv = b"\xa6\xa6\xa6\xa6\xa6\xa6\xa6\xa6"
    r = [wrapped_key[i : i + 8] for i in range(0, len(wrapped_key), 8)]
    a = r.pop(0)
    a, r = _unwrap_core(wrapping_key, a, r)
    if not bytes_eq(a, aiv):
        raise InvalidUnwrap()

return b"".join(r)

class InvalidUnwrap(Exception):
    pass

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