xlnt/source/worksheet/sheet_protection.cpp
2015-10-20 23:30:10 -04:00

45 lines
1011 B
C++

#include <algorithm>
#include <locale>
#include <sstream>
#include <xlnt/worksheet/sheet_protection.hpp>
namespace xlnt {
void sheet_protection::set_password(const std::string &password)
{
hashed_password_ = hash_password(password);
}
template< typename T >
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)
{
int value = character << i;
int rotated_bits = value >> 15;
value &= 0x7fff;
password ^= (value | rotated_bits);
i++;
}
password ^= plaintext_password.size();
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()); });
return hashed;
}
}