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\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5�\D6?\BD�\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2� \00$\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4�\E9\F2�\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// # =================================================================== # # Copyright (c) 2021, Legrandin # 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(),