astra/include/encryptedarg.h

#pragma once

#include <QString>
#include "blowfish.h"

// from xivdev
char ChecksumTable[] = {
    'f', 'X', '1', 'p', 'G', 't', 'd', 'S',
    '5', 'C', 'A', 'P', '4', '_', 'V', 'L'
};

char GetChecksum(unsigned int key) {
    auto value = key & 0x000F0000;
    return ChecksumTable[value >> 16];
}

#if defined(Q_OS_MAC)
// this is pretty much what wine does :-0
inline uint32_t TickCount() {
    struct mach_timebase_info convfact;
    mach_timebase_info(&convfact);

    return (mach_absolute_time() * convfact.numer) / (convfact.denom * 1000000);
}
#endif

#if defined(Q_OS_LINUX)
inline uint32_t TickCount() {
    struct timespec ts;

    clock_gettime(CLOCK_MONOTONIC, &ts);

    return (ts.tv_sec * 1000 + ts.tv_nsec / 1000000);
}
#endif

#if defined(Q_OS_WIN)
inline uint32_t TickCount() {
    return GetTickCount();
}
#endif

inline QString encryptGameArg(QString arg) {
    unsigned int rawTicks = TickCount();
    unsigned int ticks = rawTicks & 0xFFFFFFFFu;
    unsigned int key = ticks & 0xFFFF0000u;

    char buffer[9] = {};
    sprintf(buffer, "%08x", key);

    Blowfish session(QByteArray(buffer, 8));
    QByteArray encryptedArg = session.Encrypt((QString(" /T =%1").arg(ticks) + arg).toUtf8());
    QString base64 = encryptedArg.toBase64(QByteArray::Base64Option::Base64UrlEncoding | QByteArray::Base64Option::OmitTrailingEquals);
    char checksum = GetChecksum(key);

    return QString("//**sqex0003%1%2**//").arg(base64, QString(checksum));
}