xlnt/source/worksheet/sheet_protection.cpp

45 lines
1014 B
C++
Raw Normal View History

2014-05-22 05:48:51 +08:00
#include <algorithm>
#include <locale>
2014-05-21 22:20:30 +08:00
#include <sstream>
2014-08-14 06:56:34 +08:00
#include <xlnt/worksheet/sheet_protection.hpp>
2014-05-21 22:20:30 +08:00
namespace xlnt {
void sheet_protection::set_password(const std::string &password)
{
hashed_password_ = hash_password(password);
}
template <typename T>
2014-05-21 22:20:30 +08:00
std::string int_to_hex(T i)
{
std::stringstream stream;
stream << std::hex << i;
return stream.str();
}
std::string sheet_protection::hash_password(const std::string &plaintext_password)
{
int password = 0x0000;
int i = 1;
for (auto character : plaintext_password)
2014-05-21 22:20:30 +08:00
{
int value = character << i;
int rotated_bits = value >> 15;
value &= 0x7fff;
password ^= (value | rotated_bits);
i++;
}
2014-05-21 22:20:30 +08:00
password ^= plaintext_password.size();
password ^= 0xCE4B;
2014-05-21 22:20:30 +08:00
std::string hashed = int_to_hex(password);
std::transform(hashed.begin(), hashed.end(), hashed.begin(),
[](char c) { return std::toupper(c, std::locale::classic()); });
2014-05-21 22:20:30 +08:00
return hashed;
}
2014-06-06 04:19:31 +08:00
}