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cSHAKE128.py

# ===================================================================
#
# Copyright (c) 2021, Legrandin <helderijs@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ===================================================================

from Crypto.Util.py3compat import bchr

from Crypto.Util._raw_api import (VoidPointer, SmartPointer,
                                  create_string_buffer,
                                  get_raw_buffer, c_size_t,
                                  c_uint8_ptr, c_ubyte)

from Crypto.Util.number import long_to_bytes

from Crypto.Hash.keccak import _raw_keccak_lib

def _left_encode(x):
    """Left encode function as defined in NIST SP 800-185"""

assert (x < (1 << 2040) and x >= 0)

# Get number of bytes needed to represent this integer.
    num = 1 if x == 0 else (x.bit_length() + 7) // 8

return bchr(num) + long_to_bytes(x)

def _right_encode(x):
    """Right encode function as defined in NIST SP 800-185"""

assert (x < (1 << 2040) and x >= 0)

# Get number of bytes needed to represent this integer.
    num = 1 if x == 0 else (x.bit_length() + 7) // 8

return long_to_bytes(x) + bchr(num)

def _encode_str(x):
    """Encode string function as defined in NIST SP 800-185"""

bitlen = len(x) * 8
    if bitlen >= (1 << 2040):
        raise ValueError("String too large to encode in cSHAKE")

return _left_encode(bitlen) + x

def _bytepad(x, length):
    """Zero pad byte string as defined in NIST SP 800-185"""

to_pad = _left_encode(length) + x

# Note: this implementation works with byte aligned strings,
    # hence no additional bit padding is needed at this point.
    npad = (length - len(to_pad) % length) % length

return to_pad + b'\x00' * npad

class cSHAKE_XOF(object):
    """A cSHAKE hash object.
    Do not instantiate directly.
    Use the :func:`new` function.
    """

def __init__(self, data, custom, capacity, function):
        state = VoidPointer()

if custom or function:
            prefix_unpad = _encode_str(function) + _encode_str(custom)
            prefix = _bytepad(prefix_unpad, (1600 - capacity)//8)
            self._padding = 0x04
        else:
            prefix = None
            self._padding = 0x1F  # for SHAKE

result = _raw_keccak_lib.keccak_init(state.address_of(),
                                             c_size_t(capacity//8),
                                             c_ubyte(24))
        if result:
            raise ValueError("Error %d while instantiating cSHAKE"
                             % result)
        self._state = SmartPointer(state.get(),
                                   _raw_keccak_lib.keccak_destroy)
        self._is_squeezing = False

if prefix:
            self.update(prefix)

if data:
            self.update(data)

def update(self, data):
        """Continue hashing of a message by consuming the next chunk of data.

Args:
            data (byte string/byte array/memoryview): The next chunk of the message being hashed.
        """

if self._is_squeezing:
            raise TypeError("You cannot call 'update' after the first 'read'")

result = _raw_keccak_lib.keccak_absorb(self._state.get(),
                                               c_uint8_ptr(data),
                                               c_size_t(len(data)))
        if result:
            raise ValueError("Error %d while updating %s state"
                             % (result, self.name))
        return self

def read(self, length):
        """
        Compute the next piece of XOF output.

.. note::
            You cannot use :meth:`update` anymore after the first call to
            :meth:`read`.

Args:
            length (integer): the amount of bytes this method must return

:return: the next piece of XOF output (of the given length)
        :rtype: byte string
        """

self._is_squeezing = True
        bfr = create_string_buffer(length)
        result = _raw_keccak_lib.keccak_squeeze(self._state.get(),
                                                bfr,
                                                c_size_t(length),
                                                c_ubyte(self._padding))
        if result:
            raise ValueError("Error %d while extracting from %s"
                             % (result, self.name))

return get_raw_buffer(bfr)

def _new(data, custom, function):
    # Use Keccak[256]
    return cSHAKE_XOF(data, custom, 256, function)

def new(data=None, custom=None):
    """Return a fresh instance of a cSHAKE128 object.

Args:
       data (bytes/bytearray/memoryview):
        Optional.
        The very first chunk of the message to hash.
        It is equivalent to an early call to :meth:`update`.
       custom (bytes):
        Optional.
        A customization bytestring (``S`` in SP 800-185).

:Return: A :class:`cSHAKE_XOF` object
    """

# Use Keccak[256]
    return cSHAKE_XOF(data, custom, 256, b'')

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2024-10-01 05:01:09
..	dir	-	root/root	drwxr-xr-x	2024-10-01 05:01:09
__pycache__	dir	-	root/root	drwxr-xr-x	2024-10-01 05:01:09
BLAKE2b.py	text/x-script.python	9.2 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
BLAKE2b.pyi	text/x-script.python	906 B	root/root	-rw-r--r--	2024-09-04 06:22:37
BLAKE2s.py	text/x-script.python	9.21 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
BLAKE2s.pyi	text/x-script.python	739 B	root/root	-rw-r--r--	2024-09-04 06:22:37
CMAC.py	text/x-script.python	10.11 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
CMAC.pyi	text/x-script.python	822 B	root/root	-rw-r--r--	2024-09-04 06:22:37
HMAC.py	text/x-script.python	6.86 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
HMAC.pyi	text/x-script.python	624 B	root/root	-rw-r--r--	2024-09-04 06:22:37
KMAC128.py	text/x-script.python	5.81 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
KMAC128.pyi	text/x-script.python	903 B	root/root	-rw-r--r--	2024-09-04 06:22:37
KMAC256.py	text/x-script.python	2.84 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
KMAC256.pyi	text/x-script.python	226 B	root/root	-rw-r--r--	2024-09-04 06:22:37
KangarooTwelve.py	text/x-script.python	8.82 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
KangarooTwelve.pyi	text/x-script.python	572 B	root/root	-rw-r--r--	2024-09-04 06:22:37
MD2.py	text/x-script.python	5.97 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
MD2.pyi	text/x-script.python	492 B	root/root	-rw-r--r--	2024-09-04 06:22:37
MD4.py	text/x-script.python	6.43 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
MD4.pyi	text/x-script.python	532 B	root/root	-rw-r--r--	2024-09-04 06:22:37
MD5.py	text/x-script.python	6.46 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
MD5.pyi	text/x-script.python	492 B	root/root	-rw-r--r--	2024-09-04 06:22:37
Poly1305.py	text/x-script.python	7.88 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
Poly1305.pyi	text/x-script.python	665 B	root/root	-rw-r--r--	2024-09-04 06:22:37
RIPEMD.py	text/x-script.python	1.17 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
RIPEMD.pyi	text/plain	94 B	root/root	-rw-r--r--	2024-09-04 06:22:37
RIPEMD160.py	text/x-script.python	6.25 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
RIPEMD160.pyi	text/x-script.python	516 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA.py	text/x-script.python	1.12 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA.pyi	text/x-script.python	161 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA1.py	text/x-script.python	6.53 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA1.pyi	text/x-script.python	536 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA224.py	text/x-script.python	6.74 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA224.pyi	text/x-script.python	544 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA256.py	text/x-script.python	6.74 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA256.pyi	text/x-script.python	612 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA384.py	text/x-script.python	6.74 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA384.pyi	text/x-script.python	544 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA3_224.py	text/x-script.python	6.03 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA3_224.pyi	text/x-script.python	605 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA3_256.py	text/x-script.python	6.03 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA3_256.pyi	text/x-script.python	605 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA3_384.py	text/x-script.python	6.13 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA3_384.pyi	text/x-script.python	605 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA3_512.py	text/x-script.python	5.99 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA3_512.pyi	text/x-script.python	605 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA512.py	text/x-script.python	7.54 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHA512.pyi	text/x-script.python	622 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHAKE128.py	text/x-script.python	4.65 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHAKE128.pyi	text/x-script.python	437 B	root/root	-rw-r--r--	2024-09-04 06:22:37
SHAKE256.py	text/x-script.python	4.65 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
SHAKE256.pyi	text/x-script.python	437 B	root/root	-rw-r--r--	2024-09-04 06:22:37
TupleHash128.py	text/x-script.python	4.61 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
TupleHash128.pyi	text/x-script.python	652 B	root/root	-rw-r--r--	2024-09-04 06:22:37
TupleHash256.py	text/x-script.python	2.84 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
TupleHash256.pyi	text/x-script.python	144 B	root/root	-rw-r--r--	2024-09-04 06:22:37
_BLAKE2b.abi3.so	application/x-pie-executable	15.75 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_BLAKE2s.abi3.so	application/x-pie-executable	15.75 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_MD2.abi3.so	application/x-pie-executable	15.8 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_MD4.abi3.so	application/x-pie-executable	15.84 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_MD5.abi3.so	application/x-pie-executable	15.95 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_RIPEMD160.abi3.so	application/x-pie-executable	19.77 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_SHA1.abi3.so	application/x-pie-executable	19.95 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_SHA224.abi3.so	application/x-pie-executable	23.97 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_SHA256.abi3.so	application/x-pie-executable	23.97 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_SHA384.abi3.so	application/x-pie-executable	27.98 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_SHA512.abi3.so	application/x-pie-executable	28.01 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
__init__.py	text/plain	1.21 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
__init__.pyi	application/x-empty	0 B	root/root	-rw-r--r--	2024-09-04 06:22:37
_ghash_clmul.abi3.so	application/x-pie-executable	15.58 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_ghash_portable.abi3.so	application/x-pie-executable	15.48 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_keccak.abi3.so	application/x-pie-executable	20.03 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
_poly1305.abi3.so	application/x-pie-executable	15.94 KB	root/root	-rwxr-xr-x	2024-09-04 06:22:57
cSHAKE128.py	text/x-script.python	6.17 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
cSHAKE128.pyi	text/x-script.python	499 B	root/root	-rw-r--r--	2024-09-04 06:22:37
cSHAKE256.py	text/x-script.python	2.15 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
cSHAKE256.pyi	text/x-script.python	231 B	root/root	-rw-r--r--	2024-09-04 06:22:37
keccak.py	text/x-script.python	7.37 KB	root/root	-rw-r--r--	2024-09-04 06:22:37
keccak.pyi	text/x-script.python	741 B	root/root	-rw-r--r--	2024-09-04 06:22:37