64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
#include "encryption_functions.h"
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#include "hex_functions.h"
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QString fanta_encrypt(QString temp_input, unsigned int p_key)
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{
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//using standard stdlib types is actually easier here because of implicit char<->int conversion
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//which in turn makes encryption arithmetic easier
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unsigned int key = p_key;
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unsigned int C1 = 53761;
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unsigned int C2 = 32618;
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QVector<uint_fast8_t> temp_result;
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std::string input = temp_input.toUtf8().constData();
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for (unsigned int pos = 0 ; pos < input.size() ; ++pos)
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{
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uint_fast8_t output = input.at(pos) ^ (key >> 8) % 256;
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temp_result.append(output);
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key = (temp_result.at(pos) + key) * C1 + C2;
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}
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std::string result = "";
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for (uint_fast8_t i_int : temp_result)
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{
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result += omni::int_to_hex(i_int);
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}
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QString final_result = QString::fromStdString(result);
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return final_result;
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}
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QString fanta_decrypt(QString temp_input, unsigned int key)
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{
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std::string input = temp_input.toUtf8().constData();
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QVector<unsigned int> unhexed_vector;
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for(unsigned int i=0; i< input.length(); i+=2)
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{
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std::string byte = input.substr(i,2);
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unsigned int hex_int = strtoul(byte.c_str(), nullptr, 16);
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unhexed_vector.append(hex_int);
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}
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unsigned int C1 = 53761;
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unsigned int C2 = 32618;
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std::string result = "";
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for (int pos = 0 ; pos < unhexed_vector.size() ; ++pos)
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{
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unsigned char output = unhexed_vector.at(pos) ^ (key >> 8) % 256;
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result += output;
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key = (unhexed_vector.at(pos) + key) * C1 + C2;
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}
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return QString::fromStdString(result);
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}
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