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📁 ..
📄 BLAKE2b.py(9.2 KB)
📄 BLAKE2b.pyi(906 B)
📄 BLAKE2s.py(9.21 KB)
📄 BLAKE2s.pyi(739 B)
📄 CMAC.py(10.11 KB)
📄 CMAC.pyi(822 B)
📄 HMAC.py(6.86 KB)
📄 HMAC.pyi(624 B)
📄 KMAC128.py(5.81 KB)
📄 KMAC128.pyi(903 B)
📄 KMAC256.py(2.84 KB)
📄 KMAC256.pyi(226 B)
📄 KangarooTwelve.py(8.82 KB)
📄 KangarooTwelve.pyi(572 B)
📄 MD2.py(5.97 KB)
📄 MD2.pyi(492 B)
📄 MD4.py(6.43 KB)
📄 MD4.pyi(532 B)
📄 MD5.py(6.46 KB)
📄 MD5.pyi(492 B)
📄 Poly1305.py(7.88 KB)
📄 Poly1305.pyi(665 B)
📄 RIPEMD.py(1.17 KB)
📄 RIPEMD.pyi(94 B)
📄 RIPEMD160.py(6.25 KB)
📄 RIPEMD160.pyi(516 B)
📄 SHA.py(1.12 KB)
📄 SHA.pyi(161 B)
📄 SHA1.py(6.53 KB)
📄 SHA1.pyi(536 B)
📄 SHA224.py(6.74 KB)
📄 SHA224.pyi(544 B)
📄 SHA256.py(6.74 KB)
📄 SHA256.pyi(612 B)
📄 SHA384.py(6.74 KB)
📄 SHA384.pyi(544 B)
📄 SHA3_224.py(6.03 KB)
📄 SHA3_224.pyi(605 B)
📄 SHA3_256.py(6.03 KB)
📄 SHA3_256.pyi(605 B)
📄 SHA3_384.py(6.13 KB)
📄 SHA3_384.pyi(605 B)
📄 SHA3_512.py(5.99 KB)
📄 SHA3_512.pyi(605 B)
📄 SHA512.py(7.54 KB)
📄 SHA512.pyi(622 B)
📄 SHAKE128.py(4.65 KB)
📄 SHAKE128.pyi(437 B)
📄 SHAKE256.py(4.65 KB)
📄 SHAKE256.pyi(437 B)
📄 TupleHash128.py(4.61 KB)
📄 TupleHash128.pyi(652 B)
📄 TupleHash256.py(2.84 KB)
📄 TupleHash256.pyi(144 B)
📄 _BLAKE2b.abi3.so(15.75 KB)
📄 _BLAKE2s.abi3.so(15.75 KB)
📄 _MD2.abi3.so(15.8 KB)
📄 _MD4.abi3.so(15.84 KB)
📄 _MD5.abi3.so(15.95 KB)
📄 _RIPEMD160.abi3.so(19.77 KB)
📄 _SHA1.abi3.so(19.95 KB)
📄 _SHA224.abi3.so(23.97 KB)
📄 _SHA256.abi3.so(23.97 KB)
📄 _SHA384.abi3.so(27.98 KB)
📄 _SHA512.abi3.so(28.01 KB)
📄 __init__.py(1.21 KB)
📄 __init__.pyi(0 B)
📁 __pycache__
📄 _ghash_clmul.abi3.so(15.58 KB)
📄 _ghash_portable.abi3.so(15.48 KB)
📄 _keccak.abi3.so(20.03 KB)
📄 _poly1305.abi3.so(15.94 KB)
📄 cSHAKE128.py(6.17 KB)
📄 cSHAKE128.pyi(499 B)
📄 cSHAKE256.py(2.15 KB)
📄 cSHAKE256.pyi(231 B)
📄 keccak.py(7.37 KB)
📄 keccak.pyi(741 B)

Editing: KangarooTwelve.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._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.Util.py3compat import bchr

from .keccak import _raw_keccak_lib

def _length_encode(x):
    if x == 0:
        return b'\x00'

S = long_to_bytes(x)
    return S + bchr(len(S))

# Possible states for a KangarooTwelve instance, which depend on the amount of data processed so far.
SHORT_MSG = 1       # Still within the first 8192 bytes, but it is not certain we will exceed them.
LONG_MSG_S0 = 2     # Still within the first 8192 bytes, and it is certain we will exceed them.
LONG_MSG_SX = 3     # Beyond the first 8192 bytes.
SQUEEZING = 4       # No more data to process.

class K12_XOF(object):
    """A KangarooTwelve hash object.
    Do not instantiate directly.
    Use the :func:`new` function.
    """

def __init__(self, data, custom):

if custom == None:
            custom = b''

self._custom = custom + _length_encode(len(custom))
        self._state = SHORT_MSG
        self._padding = None        # Final padding is only decided in read()

# Internal hash that consumes FinalNode
        self._hash1 = self._create_keccak()
        self._length1 = 0

# Internal hash that produces CV_i (reset each time)
        self._hash2 = None
        self._length2 = 0

# Incremented by one for each 8192-byte block
        self._ctr = 0

if data:
            self.update(data)

def _create_keccak(self):
        state = VoidPointer()
        result = _raw_keccak_lib.keccak_init(state.address_of(),
                                             c_size_t(32),  # 32 bytes of capacity (256 bits)
                                             c_ubyte(12))   # Reduced number of rounds
        if result:
            raise ValueError("Error %d while instantiating KangarooTwelve"
                             % result)
        return SmartPointer(state.get(), _raw_keccak_lib.keccak_destroy)

def _update(self, data, hash_obj):
        result = _raw_keccak_lib.keccak_absorb(hash_obj.get(),
                                               c_uint8_ptr(data),
                                               c_size_t(len(data)))
        if result:
            raise ValueError("Error %d while updating KangarooTwelve state"
                             % result)

def _squeeze(self, hash_obj, length, padding):
        bfr = create_string_buffer(length)
        result = _raw_keccak_lib.keccak_squeeze(hash_obj.get(),
                                                bfr,
                                                c_size_t(length),
                                                c_ubyte(padding))
        if result:
            raise ValueError("Error %d while extracting from KangarooTwelve"
                             % result)

return get_raw_buffer(bfr)

def _reset(self, hash_obj):
        result = _raw_keccak_lib.keccak_reset(hash_obj.get())
        if result:
            raise ValueError("Error %d while resetting KangarooTwelve state"
                             % result)

def update(self, data):
        """Hash the next piece of data.

.. note::
            For better performance, submit chunks with a length multiple of 8192 bytes.

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

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

if self._state == SHORT_MSG:
            next_length = self._length1 + len(data)

if next_length + len(self._custom) <= 8192:
                self._length1 = next_length
                self._update(data, self._hash1)
                return self

# Switch to tree hashing
            self._state = LONG_MSG_S0

if self._state == LONG_MSG_S0:
            data_mem = memoryview(data)
            assert(self._length1 < 8192)
            dtc = min(len(data), 8192 - self._length1)
            self._update(data_mem[:dtc], self._hash1)
            self._length1 += dtc

if self._length1 < 8192:
                return self

# Finish hashing S_0 and start S_1
            assert(self._length1 == 8192)

divider = b'\x03' + b'\x00' * 7
            self._update(divider, self._hash1)
            self._length1 += 8

self._hash2 = self._create_keccak()
            self._length2 = 0
            self._ctr = 1

self._state = LONG_MSG_SX
            return self.update(data_mem[dtc:])

# LONG_MSG_SX
        assert(self._state == LONG_MSG_SX)
        index = 0
        len_data = len(data)

# All iteractions could actually run in parallel
        data_mem = memoryview(data)
        while index < len_data:

new_index = min(index + 8192 - self._length2, len_data)
            self._update(data_mem[index:new_index], self._hash2)
            self._length2 += new_index - index
            index = new_index

if self._length2 == 8192:
                cv_i = self._squeeze(self._hash2, 32, 0x0B)
                self._update(cv_i, self._hash1)
                self._length1 += 32
                self._reset(self._hash2)
                self._length2 = 0
                self._ctr += 1

return self

def read(self, length):
        """
        Produce more bytes of the digest.

.. 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
        """

custom_was_consumed = False

if self._state == SHORT_MSG:
            self._update(self._custom, self._hash1)
            self._padding = 0x07
            self._state = SQUEEZING

if self._state == LONG_MSG_S0:
            self.update(self._custom)
            custom_was_consumed = True
            assert(self._state == LONG_MSG_SX)

if self._state == LONG_MSG_SX:
            if not custom_was_consumed:
                self.update(self._custom)

# Is there still some leftover data in hash2?
            if self._length2 > 0:
                cv_i = self._squeeze(self._hash2, 32, 0x0B)
                self._update(cv_i, self._hash1)
                self._length1 += 32
                self._reset(self._hash2)
                self._length2 = 0
                self._ctr += 1

trailer = _length_encode(self._ctr - 1) + b'\xFF\xFF'
            self._update(trailer, self._hash1)

self._padding = 0x06
            self._state = SQUEEZING

return self._squeeze(self._hash1, length, self._padding)

def new(self, data=None, custom=b''):
        return type(self)(data, custom)

def new(data=None, custom=None):
    """Return a fresh instance of a KangarooTwelve 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 byte string.

:Return: A :class:`K12_XOF` object
    """

return K12_XOF(data, custom)

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