SkullCyberArmy Bypass Shell

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File Name : Counter.py

# -*- coding: ascii -*-
#
#  Util/Counter.py : Fast counter for use with CTR-mode ciphers
#
# Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net>
#
# ===================================================================
# The contents of this file are dedicated to the public domain.  To
# the extent that dedication to the public domain is not available,
# everyone is granted a worldwide, perpetual, royalty-free,
# non-exclusive license to exercise all rights associated with the
# contents of this file for any purpose whatsoever.
# No rights are reserved.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# ===================================================================

def new(nbits, prefix=b"", suffix=b"", initial_value=1, little_endian=False, allow_wraparound=False):
    """Create a stateful counter block function suitable for CTR encryption modes.

Each call to the function returns the next counter block.
    Each counter block is made up by three parts:

+------+--------------+-------+
    |prefix| counter value|postfix|
    +------+--------------+-------+

The counter value is incremented by 1 at each call.

Args:
      nbits (integer):
        Length of the desired counter value, in bits. It must be a multiple of 8.
      prefix (byte string):
        The constant prefix of the counter block. By default, no prefix is
        used.
      suffix (byte string):
        The constant postfix of the counter block. By default, no suffix is
        used.
      initial_value (integer):
        The initial value of the counter. Default value is 1.
        Its length in bits must not exceed the argument ``nbits``.
      little_endian (boolean):
        If ``True``, the counter number will be encoded in little endian format.
        If ``False`` (default), in big endian format.
      allow_wraparound (boolean):
        This parameter is ignored.
    Returns:
      An object that can be passed with the :data:`counter` parameter to a CTR mode
      cipher.

It must hold that *len(prefix) + nbits//8 + len(suffix)* matches the
    block size of the underlying block cipher.
    """

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

iv_bl = initial_value.bit_length()
    if iv_bl > nbits:
        raise ValueError("Initial value takes %d bits but it is longer than "
                         "the counter (%d bits)" %
                         (iv_bl, nbits))

# Ignore wraparound
    return {"counter_len": nbits // 8,
            "prefix": prefix,
            "suffix": suffix,
            "initial_value": initial_value,
            "little_endian": little_endian
            }

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2023-09-12 12:51:40
..	dir	-	0755	2023-09-12 12:51:40
__pycache__	dir	-	0755	2023-09-12 12:51:40
Counter.py	text/x-script.python	3.04 KB	0644	2023-06-23 12:19:28
Counter.pyi	text/x-script.python	290 B	0644	2023-06-23 12:19:28
Padding.py	text/x-script.python	4.21 KB	0644	2023-06-23 12:19:28
Padding.pyi	text/x-script.python	238 B	0644	2023-06-23 12:19:28
RFC1751.py	text/x-script.python	20.7 KB	0644	2023-06-23 12:19:28
RFC1751.pyi	text/x-script.python	159 B	0644	2023-06-23 12:19:28
__init__.py	text/plain	1.88 KB	0644	2023-06-23 12:19:28
_cpu_features.py	text/x-script.python	1.94 KB	0644	2023-06-23 12:19:28
_cpu_features.pyi	text/plain	59 B	0644	2023-06-23 12:19:28
_cpuid_c.abi3.so	application/x-pie-executable	18.85 KB	0755	2023-06-23 12:19:28
_file_system.py	text/x-script.python	2.12 KB	0644	2023-06-23 12:19:28
_file_system.pyi	text/x-script.python	100 B	0644	2023-06-23 12:19:28
_raw_api.py	text/x-script.python	9.99 KB	0644	2023-06-23 12:19:28
_raw_api.pyi	text/x-script.python	906 B	0644	2023-06-23 12:19:28
_strxor.abi3.so	application/x-pie-executable	19.9 KB	0755	2023-06-23 12:19:28
asn1.py	text/x-script.python	35.32 KB	0644	2023-06-23 12:19:28
asn1.pyi	text/x-script.python	3.72 KB	0644	2023-06-23 12:19:28
number.py	text/x-script.python	94.11 KB	0644	2023-06-23 12:19:28
number.pyi	text/x-script.python	975 B	0644	2023-06-23 12:19:28
py3compat.py	text/x-script.python	5.4 KB	0644	2023-06-23 12:19:28
py3compat.pyi	text/x-script.python	837 B	0644	2023-06-23 12:19:28
strxor.py	text/x-script.python	5.31 KB	0644	2023-06-23 12:19:28
strxor.pyi	text/x-script.python	243 B	0644	2023-06-23 12:19:28