FM / primitives

/snap/core20/2866/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/

/snap/core20/2866/usr/lib/python3/dist-packages/cryptography/hazmat/primitives

Name	Size	Mode	Actions
asymmetric/	-	0755	rm
ciphers/	-	0755	rm
kdf/	-	0755	rm
serialization/	-	0755	rm
twofactor/	-	0755	rm
__pycache__/	-	0755	rm
cmac.py	2075	0644	edit dl rm
constant_time.py	1139	0644	edit dl rm
hashes.py	6206	0644	edit dl rm
hmac.py	2196	0644	edit dl rm
keywrap.py	5462	0644	edit dl rm
padding.py	5644	0644	edit dl rm
poly1305.py	1668	0644	edit dl rm
__init__.py	246	0644	edit dl rm

Edit: /snap/core20/2866/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/padding.py (5644B)

# 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.

from __future__ import absolute_import, division, print_function

import abc

import six

from cryptography import utils
from cryptography.exceptions import AlreadyFinalized
from cryptography.hazmat.bindings._padding import lib

@six.add_metaclass(abc.ABCMeta)
class PaddingContext(object):
    @abc.abstractmethod
    def update(self, data):
        """
        Pads the provided bytes and returns any available data as bytes.
        """

@abc.abstractmethod
    def finalize(self):
        """
        Finalize the padding, returns bytes.
        """

def _byte_padding_check(block_size):
    if not (0 <= block_size <= 2040):
        raise ValueError("block_size must be in range(0, 2041).")

if block_size % 8 != 0:
        raise ValueError("block_size must be a multiple of 8.")

def _byte_padding_update(buffer_, data, block_size):
    if buffer_ is None:
        raise AlreadyFinalized("Context was already finalized.")

utils._check_bytes("data", data)

buffer_ += data

finished_blocks = len(buffer_) // (block_size // 8)

result = buffer_[:finished_blocks * (block_size // 8)]
    buffer_ = buffer_[finished_blocks * (block_size // 8):]

return buffer_, result

def _byte_padding_pad(buffer_, block_size, paddingfn):
    if buffer_ is None:
        raise AlreadyFinalized("Context was already finalized.")

pad_size = block_size // 8 - len(buffer_)
    return buffer_ + paddingfn(pad_size)

def _byte_unpadding_update(buffer_, data, block_size):
    if buffer_ is None:
        raise AlreadyFinalized("Context was already finalized.")

utils._check_bytes("data", data)

buffer_ += data

finished_blocks = max(len(buffer_) // (block_size // 8) - 1, 0)

result = buffer_[:finished_blocks * (block_size // 8)]
    buffer_ = buffer_[finished_blocks * (block_size // 8):]

return buffer_, result

def _byte_unpadding_check(buffer_, block_size, checkfn):
    if buffer_ is None:
        raise AlreadyFinalized("Context was already finalized.")

if len(buffer_) != block_size // 8:
        raise ValueError("Invalid padding bytes.")

valid = checkfn(buffer_, block_size // 8)

if not valid:
        raise ValueError("Invalid padding bytes.")

pad_size = six.indexbytes(buffer_, -1)
    return buffer_[:-pad_size]

class PKCS7(object):
    def __init__(self, block_size):
        _byte_padding_check(block_size)
        self.block_size = block_size

def padder(self):
        return _PKCS7PaddingContext(self.block_size)

def unpadder(self):
        return _PKCS7UnpaddingContext(self.block_size)

@utils.register_interface(PaddingContext)
class _PKCS7PaddingContext(object):
    def __init__(self, block_size):
        self.block_size = block_size
        # TODO: more copies than necessary, we should use zero-buffer (#193)
        self._buffer = b""

def update(self, data):
        self._buffer, result = _byte_padding_update(
            self._buffer, data, self.block_size)
        return result

def _padding(self, size):
        return six.int2byte(size) * size

def finalize(self):
        result = _byte_padding_pad(
            self._buffer, self.block_size, self._padding)
        self._buffer = None
        return result

@utils.register_interface(PaddingContext)
class _PKCS7UnpaddingContext(object):
    def __init__(self, block_size):
        self.block_size = block_size
        # TODO: more copies than necessary, we should use zero-buffer (#193)
        self._buffer = b""

def update(self, data):
        self._buffer, result = _byte_unpadding_update(
            self._buffer, data, self.block_size)
        return result

def finalize(self):
        result = _byte_unpadding_check(
            self._buffer, self.block_size,
            lib.Cryptography_check_pkcs7_padding)
        self._buffer = None
        return result

class ANSIX923(object):
    def __init__(self, block_size):
        _byte_padding_check(block_size)
        self.block_size = block_size

def padder(self):
        return _ANSIX923PaddingContext(self.block_size)

def unpadder(self):
        return _ANSIX923UnpaddingContext(self.block_size)

@utils.register_interface(PaddingContext)
class _ANSIX923PaddingContext(object):
    def __init__(self, block_size):
        self.block_size = block_size
        # TODO: more copies than necessary, we should use zero-buffer (#193)
        self._buffer = b""

def update(self, data):
        self._buffer, result = _byte_padding_update(
            self._buffer, data, self.block_size)
        return result

def _padding(self, size):
        return six.int2byte(0) * (size - 1) + six.int2byte(size)

def finalize(self):
        result = _byte_padding_pad(
            self._buffer, self.block_size, self._padding)
        self._buffer = None
        return result

@utils.register_interface(PaddingContext)
class _ANSIX923UnpaddingContext(object):
    def __init__(self, block_size):
        self.block_size = block_size
        # TODO: more copies than necessary, we should use zero-buffer (#193)
        self._buffer = b""

def update(self, data):
        self._buffer, result = _byte_unpadding_update(
            self._buffer, data, self.block_size)
        return result

def finalize(self):
        result = _byte_unpadding_check(
            self._buffer, self.block_size,
            lib.Cryptography_check_ansix923_padding)
        self._buffer = None
        return result

cmd: