xlnt/source/worksheet/sheet_protection.cpp

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#include <algorithm>
#include <locale>
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#include <sstream>
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#include <xlnt/worksheet/sheet_protection.hpp>
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namespace {
template <typename T>
std::string int_to_hex(T i)
{
std::stringstream stream;
stream << std::hex << i;
return stream.str();
}
} // namespace
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namespace xlnt {
void sheet_protection::set_password(const std::string &password)
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{
hashed_password_ = hash_password(password);
}
std::string sheet_protection::get_hashed_password() const
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{
return hashed_password_;
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}
std::string sheet_protection::hash_password(const std::string &plaintext_password)
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{
int password = 0x0000;
int i = 1;
for (auto character : plaintext_password)
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{
int value = character << i;
int rotated_bits = value >> 15;
value &= 0x7fff;
password ^= (value | rotated_bits);
i++;
}
password ^= plaintext_password.size();
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password ^= 0xCE4B;
std::string hashed = int_to_hex(password);
std::transform(hashed.begin(), hashed.end(), hashed.begin(),
[](char c) { return std::toupper(c, std::locale::classic()); });
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return hashed;
}
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}