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79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
// Copyright (c) 2014-2016 Thomas Fussell
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// Copyright (c) 2010-2015 openpyxl
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, WRISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE
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//
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// @license: http://www.opensource.org/licenses/mit-license.php
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// @author: see AUTHORS file
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#include <algorithm>
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#include <locale>
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#include <sstream>
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#include <xlnt/worksheet/sheet_protection.hpp>
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namespace {
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template <typename T>
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std::string int_to_hex(T i)
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{
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std::stringstream stream;
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stream << std::hex << i;
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return stream.str();
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}
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} // namespace
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namespace xlnt {
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void sheet_protection::password(const std::string &password)
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{
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hashed_password_ = hash_password(password);
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}
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std::string sheet_protection::hashed_password() const
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{
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return hashed_password_;
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}
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std::string sheet_protection::hash_password(const std::string &plaintext_password)
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{
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int password = 0x0000;
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int i = 1;
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for (auto character : plaintext_password)
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{
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int value = character << i;
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int rotated_bits = value >> 15;
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value &= 0x7fff;
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password ^= (value | rotated_bits);
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i++;
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}
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password ^= plaintext_password.size();
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password ^= 0xCE4B;
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std::string hashed = int_to_hex(password);
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std::transform(hashed.begin(), hashed.end(), hashed.begin(),
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[](char c) { return std::toupper(c, std::locale::classic()); });
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return hashed;
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}
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}
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